A 70/35 h.p., 1,300/650 r.p.m. N-S motor, conveniently tucked away behind the gearbox in the base of a large Richards boring machine.
The adaptable N-S VARIABLE SPEED A,C. MOTOR will do the job
The N tS is com pact in size and is available in any enclosure and form of mounting. It seldom needs inspection, because its excellent ^commutation minimises maintenance. Jjs regulator can be fitted in any convenient position and can be operated direct by hand or from remote push-button stations or automatic devices. Standard designs range up to 500 h.p. for normal speeds and speed ranges, but larger outputs can be given. LAURENCE, SCOTT & ELECTROMOTORS LTD. NORWICH, MANCHESTER, LONDON AND BRANCHES E l e c t r i c a l R e v ie w August 9, 1946
INCREASE PRODUCTION BY 1 August 9, 1946 E lectrical R eview .
“ As the Manager of an Electricity Corporation, I’ve many problems which are peculiarly my own . . . not the least of which is the problem of servicing apparatus on the district.
“ It looks as though H EA T R A E have always anticipated my problem and taken steps to minimise it, by producing types of Electric W ater Heater requiring such minimum attention as to represent an automatic discount off my servicing costs.”
leaders in electric water heaters
HEATRAE LTD., NORWICH PHONE : NORWICH 25131 GRAMS : HEATRAE, NORWICH
REPAIRS SOUND TERMINAL WITHOUT SOLDER Th. WESTMINSTER ENG.Co.Ltd. Suitable for Telephone Lines Victoria Road, Willesden Junction, N.W.IO F O R C A B L E S S IZ E S F R O M A N D W IR E S v to r OF ALL KINDS HOLE Ross Courtney & Co. Ltd. ASHBROOK ROAD, LONDON, N.I9
BRASS RINGS to the spec ific require ments of our customers 1500 kVA Turbo Generator Stator and Rotor Entirely Rewound Makers of all types of repe tition products Makers of Electric Welding Machines, from the bar in Photo Printing and Process Arc Lamps. all metals " Partridge ” Pressure Detectors M C L ana REPETITIO N LTD. Telephone: Telegrams: Pool Lane • Lanqlcq • BiPMinqham. Elgar 7372 (2 lines) “ Regency, Phone, London.” lectrical eview 2 . E R August 9, 1946
Telford Road Sub-Station of EDINBURGH CORPN. showing C o m b in e d Vo l t a g e a n d , a 10,000 K .V .A . Transform er equipment for combined voltage P h a se A n g le C o n t r o l and phase angle control, UNDER LOAD
Recent developments in Transformer phase and quadrature booster, the Engineering include transformer units voltage being injected into the 33 K.V. with combined In-phase and Q uad neutral, for phase angle control. rature voltage control with tap- Remote electrically controlled ‘ on changing under load to give phase load ’ tap changers are provided on angle control, or to introduce a the in-phase and quadrature windings variable phase displacement in the of the exciter transform er for plus line, without disturbing the load. or minus 10% voltage variation in twenty 1% steps, independently con The illustration shows a typical sub trolled to give the phase angle variation station comprising a 10,000 K .V .A ., required. 33,000/6,600 volt transformer with in
BRUCE PEEBLES &. CO.,LTD. ENGINEERS, EDINBURGH. 3 August 9, 1946 E lectrical R eview
THE SMALLEST TRIPLE POLE SWITCHFUSE EMINENTLY SUITABLE FOR MACHINE TOOLS j p RADETTE. 10AMPERES. 5 0 0 VOLTS. CATALOGUE N °Q I4S8
BILL SWITCHGEAR LTD ASTON LANE. PERRY BARR LONDON A.W.ZELLEY. 73 GT PETER ST BIRMINGHAM-20 WESTMINSTER SYM. PHONE BIRCHFIEUS 5 0 1 1 . « A M S .'B l (SWITCH fHAM -32
i ig R E R S EARTH LEAKAGE CIRCUIT BREAKERS
30 Amps. 500 Volts A.C. 50 Cycles DOUBLE POLE All-Insulated Complying with B.S. Specification Immediate delivery 842— 1939 from stock
Leaflet No. 15 5 sent on application SIEMENS ELECTRIC LAMPS AND SUPPLIES LIMITED 38-39 UPPER THAMES STREET, LONDON, E.C.4 Electrical Review August 9, 1946 AN E X A M P L E OF T.T. ENTERPRISE
(one million volt positive discharge rising to peak value in 0.9 microseconds and falling to half value in 50 microseconds) motion picture of a SURGE
The “ real life ” graph that an oscillogram gives—a continuous, moving picture of what is happening under given conditions—provides invaluable data. In our modern and well equipped High Voltage Testing Laboratory at Stoke, nothing is left undone to provide you with the best. Whether in giant H.T. insulators or the smallest die-pressed parts, you can rely on T.T. being always “ one jump ahead.” i r r s r : r c : : leaders in electrical porcelain
H. T. & L. T. INSULATORS, DIE PRESSINGS, LOW LOSS CERAMICS
HEAD OFFICE : EASTWOOD, HANLEY, STAFFS LONDON : 125 HIGH HOLBORN, W.C.I Factories at Hanley, Stone and Longton, Staffs. Telephone : Holborn 1951-52 and Stoke-on-Trent 5272-4.
T A S /' August 9, 1946 E lectrical R eview 5
«¡Mg! ■ V, i @ © F JWSWITCHGEAR n>~£t£, tiie. ¿D’t4xjp€~ CLASS BP 31
*
■S : - v . 5 i l l
2 5 MVA. 3-3 kV. Groups I and 2
■ 1 D T' U I 1 I E S P E N Ao i l 1T F D 6 E lectrical R eview August 9, 1946
Copper— what's that to do with a bicycle wheel? Well, the spoke nipples are made of copper alloy. So are all the metal parts of the tyre valve. And, in fact, from bicycles to jet planes, copper has a vital part to play in every form of trans port. Cars, locomotives, liners, too, they all depend on copper !
W hy is copper so widely used in modern transport? For the same reasons that it is widely used in almost every other field of technology. For its resistance to corrosion, for its high thermal and electrical conductivity, for its combination of toughness with ease of fabrication — these are the reasons why the experts choose copper. Are you using the special qualities of copper and its alloys as fully and profitably as you might ? The Copper Development Association will gladly provide publications, information and advice that will help you to do so.
LET COPPER CO-OPERATE
COPPER DEVELOPMENT ASSOCIATION. A non-trading organisation, maintained by the British Copper Industry to supply publications, information and advice, free, to all users of copper. Grand Buildings, Trafalgar Square, London, W .C.2 Enquiries to RE N D A IS H ALL, RADEETT, HERTS. RADIETT 5616 7 August 9, 1946 E lectrical R eview Tim W "
Unnecessary advice where
m ww ism m sm m m m
; ■ £<--- • — (QNShLlOATED pNEVMATK T 6 6- L- ^ cc. tf 0. S .W. 6.
DIESEL ENGINES • VACUUM PUMPS AIR COMPRESSORS ■ PNEUMATIC TOOLS ' ELECTRIC TOOLS OIL WELL TOOLS CONTRACTORS' EQUIPMENT • ROCK DRILLS ■ DIAMOND DRILLS CP .9 8 E lectrical R eview August 9, 1946
THE POCKET TESTOSCOPE Size of a Fountain Pen
A convenient rapid fault-finding instrument for use on A C or DC Circuits
for use on 100-750 volts
FOR TESTING
SWITCHES OPEN CIRCUITS LIVE CONDUCTORS LEAKAGES EARTHS INSULATION VALUES NEUTRAL WIRE POLARITY CONTINUITY, ETC.
Q L . tfo+ iL SWITCHES DRAKE & GORHAM fo r __ WHOLESALE LTD. 77 LONG ACRE, LONDON.W.C.2 RELIABILITY Telephone : TEMple Bar 3993
MANCHESTER: 29Piccadilly. BRIGHTON: 24Marlborough W yiex Must be qooct Place. GLASGOW : 182 St. Vincent Street. Bristol : 2-4 Church St., Temple. D UBLIN : 2 Church Lane, College GEORGE H. SCHOLES Midland Representative : Green W. T. BOWER, 184 Jockey Road, Sutton Coldfield & co- LTD- Wylex Works, Wythenshawe ^ _ MANCHFSTCD 9 August 9, 1946 E lectrical R eview ¡FTICE ILT ON ENGLISH ELECTRIC” BUS-BARS
jftr t utjfoíM a¿¿on ta FuóegeaA D ept.Stà/ffouL THE ENGLISH ELECTRIC COMPANY LIMITED LONDON OFFICE: QUEEN'S HOUSE, KINGSWAY, LONDON, W.C.2 WORKS : STAFFORD -PRESTON - RUGBY- BRADFORD -LIVERPOOL August 9, 1946 10 E lectrical R eview
WARWICK CASTLE
Founded in the early days of the Norman Conquest. The two famous Towers ‘‘Caesar's” and "G uy's" date from the fourteenth century.
CRYSE
MADE IN E N 6 LAN D
FIFTY YEARS OF Q U A L IT Y & S E R V IC E
BIRMINGHAM BURY ST EDMUNDS LEEDS L O N D O N BRIGHTON CARDIFF LEICESTER MANCHESTER BRISTOL GLASGOW LIVERPOOL N EW C A S T L E
CRYSELCO LIMITED, KEMPSTON WORKS,-BEDFORD FT69 FERRANTI LTD., H o llin w o o d , LANCS. London O ffice ffice O London LANCS. , d o o w llin o H LTD., FERRANTI y r n m m m m m t uut 9, August etrs a be appre been has useful these features of value The nier eeyhr in operating everywhere by engineers ciated EAI EPRE CE EXPERIEN G PERATIN O O FRAT TRANSFORMERS FERRANTIHOW EUE ANEAC COSTS MAINTENANCE REDUCE 1946 h ps 1 years. 15 past the etepof features weatherproof Quick Quick f ak Cover Tank of ees and release rnfre fr DOOR O O TD U O for Transformer A E lectrical s n a r typical 300 300 . R
eview
kVA,
operation 11 // t kV Kern Kern s r e r o
rahr Vent Breather House, King King House, Oil Oil Sealed sway,
11 .C.2. W 12 E lectrical R eview August 9, 1946 9 GOOD REASONS fo r th e ‘ B ’ TYPE TERMINAL
"Com e to the Po in t!"
Check up the idle machine time and loss of output caused when your small tools have to be reground. You will probably find that this is con siderably more than is gener ally realised, and very costly. 8. R A TIN G — 15 AMPS. W e offer you substantial PEAK BREAKDOW N — savings on this because 3.500 VOLTS. Macrome Treated Tools give a much bigger average output per regrind than similar un 9. THREE DIFFERENT STEM treated tools. This would give LENGTHS, WITH SOLDERING SPILL. you the following economies : (1). Reduced outlay on tools. (2). Reduced production cost per u n it. (3). Faster output.
These savings can be obtained quite simply, in two ways :— 1. When new tools are required we can supply your full require ments already Macrome Treated. 2. W e can treat your own tools.
W r ite to us for details. L1001 /1-2-3W Standard, I/4d. MACROME each. One of a range TtuLTGuqlittloeU U tkc IM d of designs from 5 amps, to 100 amps.
MACROME LTD. (dept.C.3) ALCESTER WARWICKSHIRE BELLING & LEE LTD CAMBRIDGE ARTERIAL ROAD, ENFIELD, MIDDX
G A . 1039 August 9, 1946 E lectrical R eview 13 C u l5c a n C a ö t l c S MAYBOLEAYRSHIRE
CULZEAN CASTLE, AYRSHIRE, recently < presented to the National Trust for Scotland by the Marquess of Ailsa, is a famous example of the work of Robert Adam, and it is being equipped with electric lighting and heating for the benefitof visitors, andforeasy maintenance. Part of the scheme provides for a national guest house, which will enable Scotland to provide fitting accommodation for distinguished guests. As in many other famous buildings, the electrical installation is being carried out with
Electrical Contractors fo r Culzean Castle HŁNLEY recorstruction scheme: Messrs. VM. BARTON & SONS LTD. C a b l e s I Forrest Road, Edinburgh, i Architects; IEIL & HURD, EDINBURGH
'hoto : B y courtesy ofNationalTrustfor Scotland.
W . T. HENLEY’S TELEGRAPH WORKS CO. LTD. 51-53 HATTON GARDEN, LONDON, E.C.I 14 E lectrical R eview August 9, 1946
in the manufacture of... metals such as tungsten, in volving reduction processes, hydrogen of highest purity is safely and economically obtained from a Knowles Electrolytic Plant. Hydrogen is guaranteed direct from the cell at a purity of 99-95%, together with oxygen 99-8% pure. Knowlesequipment is operating in all parts of the world, in plants from the smallest to the largest sizes.
@ ELECTROLYTIC PLANT FOR HYDROGEN C- OXYGEN THE INTERNATIONAL ELECTROLYTIC PLANT CO. LTD., SANDYCROFT, CHESTER
» H O .14 15 August 9, 1946 E lectrical R eview
Eleco planned street lighting service is
now again available. A consultation
costs nothing. Eleco fittings are
available for tungsten, sodium or
mercury discharge lamps. Each type of
fitting embodies the improvements
suggested by Eleco’s 40 years exper
ience. Catalogues on request.
ENGINEERING & LIGHTING EQUIPMENT CO. LTD.
DEPT. W.S., SPHERE WORKS. ST. ALBANS, HERTS. ’PHONE 2258/9 August 9, 1946 16 E lectrical R eview
For sheer value you cannot ‘star1 a more attractive line to your customers than the BYLOCK " Triplex ” cleaner. £ 1 2 . 1 2 . 0 (Plus £3.3.0 Tax) For instrument work, domestic and Complete with industrial apparatus and power control all accessories BYLOCE plant. Standard switches available or designed to any individual requirement. U fhttfem a/d in krety! Write for catalogue or technical advice. BRITISH MADE BY BYLOCK ELECTRIC LTD. PONDERS END, MIDDLESEX ______THE MERCURY SWITCH MANUFACTURING CO. LTD. WEST DRAYTON t MIDDLESEX —
¿ ¿ t u r f M W SHADED POLE MOTORS ( f
A sturdy silent run SPARKLETS ning m otor for 200/240 A.C. consuming 0* 15 a m p s and weighing IJ lbs. Ideal for driving axial flow fans and light mechanisms. High effi ciency, good starting torque. X PRAHA’PRESSURE % Available in variety of mountings. W rite for DIE fully descriptive folder S.P.M. CASTINGS ENGINEERING COMPANY LIMITED Establish«! 1 wun m mAiisE to* SMRKUIilTB.WEWSTIIICS BIYISIDE.L0E00E.il« COMMERCE WAY PURLEY WAY CROYDON Telephone. CROYDON 4 1 2 5 -8 Tele.jromi SYNCROY.CROYDON 17 August 9, 1946 E lectrical R eview UNIPIAIE cit/V ef'S ’
S t a n d a r d Engineers once again make a great contribution to progress with their latest development of the SenTerCel principle : the miniature UNIPLATE rectifier. Built in the form of light, oval plates, they can readily be suspended in the wiring. Their working areas are of various sizes and thus are suitable for a wide range of frequencies and uses. They can be / m j / matched for use in balanced circuits, assembled O M B O t m O / as bridge rectifiers with single or multi discs in 5 each arm or in series, parallel or series/parallel _ _ _ _ . | | | | arrangements, and so on SELENIUM In use, UNIPLATE rectifiers are exceptionally stable, even under conditions of varying KEL I S I I tHd temperature
For full particulars apply to Standard Telephones and Cables Limited (Rectifier Division) OAKLEIGH ROAD, NEW SOUTHGATE, LONDON, N. 11
X=(S«SWJ«J ENTerprise 1234 Telegrams : “ Essteecee, Telex, London ” E lectrical R eview A u g u st 9 , 1 9 4 0 A i m s
In spite of continued restrictions all available supplies of “ Britmac ” Electrical Accessories a re reaching the recognised Electrical Wholesalers who, we know, are doing their utmost to meet your demands.
Illustrated is the Surface Type, “ Universal” pattern Ceiling Switch for mounting direct to B.S. Conduit Boxes. Catalogue No. P2736.
ÉLECTRICAL ACCESSORIES FOR All INSTALLATIONS BRITMAt EL1TRUAL tO LTD. SALEÎ ORGANISATION ÛF C . H . PARSONS LTD Head Office. BRITANNIA WORKS - WHARFDALE ROAD • TYSELEY • BIRMINGHAM • || Telephone : ACOcks Green 1191 (3 lines). cr-T^rT ' “ BR!™ AC. BIR" INGHA” " Glasgow Office : GRESHAM CHAMBERS, 45 WEST NILE STREET, GLASGOW. C.l. Telephone : Central 9106 19 August 9, 1946 E lectrical R eview
A remarkably handsome Orchid, Introduced into Britain from Manila. In the form Illustrated, the sepals and petals of its flowers are of pinkish mauve passing almost to white at the edges. The lip is of the same colour speckled purple, yellow and reddish brown and the foliage is of pale green dappled dark green on the top side, the underside being purple. In nature the plant is found growing on branches of trees, the flower spikes often being 3 ft. in length.
W e ore Indebted to the Royal Horticultural Society for access to their Library.
but it’s easier to say ENFIELD F O R A L L CABLES UP TO 132 kV. PAPER RUBBER • P V C.
C~ h jy m K a u f Trvzt&Lcatf. ENFIELD CABLES LTD. BRIMSDOWN. MIDDLESEX. 2 0 E lectrical R eview August 9, 1946 BURCO V 840. Cabinet type Ele c tric Wash Boiler Post war design at its best ROSE GROVE - BURNLEY St* s c MERCURY SWITCHES for Solonoid Operated Switch DEPENDABILITY Catalogue No. XA 311 M. TYPES AVAILABLE. Tilting and non-tilting. Delayed action. For TYPICAL APPLICATIONS. small operating angles. With or without Water heaters, lift motors, telephone cir ceramic liners. All heavy duty types have cuits, flashing signs, relay circuits, and , !------'fuse. :d in.liners wherever reliable switching is required. Special models to meet customers particular requirements. FURTHER INFORMATION FROM: SALFORD ELECTRICAL INSTRUMENTS LTD. P E E L W O R K S , S A L F O R D 3, L A N C S . Phones : BLAckWars 6688 <6 lines). Grama and Cablea : “ Sparkleas Manchester" PROPRIETORS: THE GENERAL ELECTRIC Co. Ltd., OF ENGLAND August 9, 1946 E lectrical R eview 21 NAIDIRI R EC O R D IN G INSTRUMENTS The illustration shows an N.C.S. Switchboard Indicating and Recording Instrument. It is fitted with calibrated scale and indicating pointer for sight reading, and gives a clear view of the chart throughout. The complete range includes Ammeters, Voltmeters, W att meters, Frequency Meters, Power Factor Continuous flow of Ink from Ink Reservoir. Meters, etc. Chart driving mechanisms are of improved type ensuring accurate timing. They are usually NALDERS PRODUCTS arranged to give a chart speed of I inch per include Ammeters, Voltmeters, hour, but can be adapted to any required speed Wattmeters, Power Factor Meters, up to 12 inches per hour. Clocks giving a higher Synchronisers, Frequency Meters, chart speed or combination of speeds can be Protective Relays, Circuit Breakers fitted if specified. The syphon pen supplied, fed and Automatic Switches. All these from the ink reservoir, maintains a continuous and other Nalders Specialities are flow of ink. in the front rank, as guaranteed All N.C.S. Recording Instruments, Switchboard by the widely known N.C.S. or Portable pattern, conform to the requirements Trade Mark. of the British Standards Institution Specification. Let us quote to your requirements. NALDER BROS. & THOMPSON LTD. DALSTON LANE WORKS, LONDON, E.8. Phone : CUSS0LD 2365 (3 lines). Grams : OCCLUDE, HACK, LONDON E lectrical R eview August 9, 1946 THIS IS AN PULLIN ELECTRIC KETTLE WORTH WAITING FOR! W e regret that the demand for Bescol Products far exceeds the present rate of supply, but we are doing all we possibly can under the circumstances, and look forward to the day when normal labour conditions and supplies of material will enable us to satisfy each and every Bescol customer. MEASUREMENT Linear Scale Bridge-type Ohmmeter, with i / l press key, or having a hyperbolic scale without press key, specifically designed for routine production testing of all resistive com THE BESCOL “ ELEPHANT ” ponents. Supplied for battery or A.C. mains operation. (A .C . mains operated instruments ELECTRIC KETTLE are compensated for variation in voltage up to (For use on Alternating Current) plus or minus 15%). 0 Thermostatically controlled This instrument is designed and constructed 0 Streamlined body to withstand severe industrial use. Auxiliary 0 Ail-bakelite heat-resisting Limits Pointer can be provided to enable un handle skilled labour to determine instantly whether 0 Exceptionally sturdy construction or not the resistance being measured complies with the required degree of accuracy. BESCOL Available as single range or multi-range. (ELECTRIC) LIMITED PARKFIELD ROAD BIRMINGHAM, 8. All correspondence to Dept. C Phoenix Works, Great West Road, Brentford, Middlesex. Ealing 0011 9550 August 9, 1946 E lectrical R eview 23 BRA N C H ES ; London, Birmingham, Cardiff, Manchester, Bath, Leeds, Newcastle, Glasgow, Belfast, Dublin Electrical Review August 9, 1946 "LINAPEX varnished GLASS FABRICS & TAPES pr o d u c ts Build smaller and more efficient motors by using “ Linapex ” varnished glass fabrics and tapes. They are specially designed to resist high voltage at elevated temperatures. W e also manufacture INSULATING AND OILED FABRICS FOR CABLE WORK. SWITCHBOARD RUBBER MATS. A N D ELECTRICIANS’ RUBBER GLOVES lO C O LTD . Anniesland G L A S G O W m o u l d e d t e r m i n a l BLOCKS FROM 2 t o 1 2 WAYS Lengths rom to 6' Standard Width ■j-f' Height Terminal Bore Finish Black. Made in England. Q Special Prices to Wholesalers and Manufacturers. FOR DETAILS SEE LIST NO. ME.4/ER. ELECTRICAL INDUSTRIES METWAY LTD. DAVALL BROS LTD. compton ave. King St., Brighton, I, Susiex. Telephone : Brighton 4456 CAN. 5 3 6 2 CANONBURY.N.I August 9, 1946 E lectrical R eview 2 5 HIGGSCHAIRMAN BIRMINGHAM 6 Every Higgs Motor contains the wealth of 35 years’ experience in the manufac ture of industrial electrical equipment. For Direct Current Motors or Generators you cannot do better than specify HIGGS. Send for Leaflet 70. I V1* Belfast, Birmingham, Bristol, Dundee, Glasgow, London, Manchester, DV.It Nottingham, Peterborough, Sheffield, Wolverhampton. August E lectrical R eview 9, 1946 2 6 »IO ' Not until we can satisfy a l l S mcec N the complete range of NEW SLYDLOK FUSES. The design provides every conceivable mounting, w ir in g and connecting facility together with protection from 250 ACDC3 ^ e cost of a fuje wire (spare fuse wire in holder) to 500 A to w (with choice of several proprietary of cartridges) without change of Fuseholder ! These, and many other exclusive features, must be seen to be believed; but - * - first get a copy of our G99A Leaflet. W e can n o w also give an- t i c i p a t ed dates for the production of other sizes d o w n t o 5 a m p s. Burn ” Tested Super Steel Conduit, the outcome of a century’s experience in the manufacture of tubes, embodies the quality, consistency and finish vitally necessary to a good job. Every Tube tested, passed and branded to British Standard Specification 31, and the “Bee” on every tube is your security— and ours. FUSES will eventually supersede war-time designs, of which we are proud to have produced nearly seven million units during 1939/45 and which record we are preparing t o beat in the interests of Peace. CITY TUBE AND CONDUIT MILLS EDWARD & C O . L T D SMETHWICK, BIRMINGHAM Telephone : Smethwick I St! (5 lines) 70 Finsbury Pavement, E.C.i Liverpool: Caledonian Bldgs., H TilhebarnSl.2 ISHARSTON ROAD • WYTHENSHAWE I MANCHESTER dm 1294 August 9, 1946 E lectrical R eview 2 7 If Aladdin could 'clock-ill' at M E M If only the wonderful lamp were at our service we could work wonders and every order for M.E.M. gear could be met overnight. But even the wonders of modern production efficiency have their limits, especially with present day shortages, controls and restrictions. None the less, every effort is being made to improve output and an increasing stream of supplies is going out to the wholesalers. They in turn are doing a grand job of work in distributing all available equipment fairly and equitably. That’s a point to remember when you deal with your wholesaler. MIDLAND ELECTRIC MANUFACTURINC CO. LTD..TYSELEY, BIRMINGHAM, 11 SWITCH, FUSE AND MOTOR CONTROL GEAR, ELECTRIC FIRES AND LOCALISED LIGHTING EQUIPMENT London Showrooms & Sto res: 21-22 Rathbone Place, W.1 : M anchester Showrooms & Sto res: 48-50 Chapel St., Salford, 3 August 9, 1946 2 8 E lectrical R eview INSULATING BEADS ■ 8 Send your enquiries to :— STEATITE INSULATIONS LTD 177 Ravenhurst Road, Harborne, Birmingham, 17 WORKS : ENFIELD, MIDDLESEX. E.R.37 Standa%di&e on DENNIS f h t A e o N.P.L. APPROVED for CATEGORY D.C.3 'LOW Perfection In Design — Reliability In Service ELECTRIC LAMP LOCKS Hundreds of bayonet type electric lamps are pilfered G. P. DENNIS LIMITED every week because a simple precaution is not Specialists In Switchboards, Control Panels, adopted. You cannot lock up the pilferers, but Switch Fuses, Distribution Boards, Fuses, etc. you can lock up your lamps. FLEMING ROAD, SPEKE, LIVERPOOL 19 Telephone : Hunt» Cross 1217/8 £e*rd far SoAPtple to lonooh < C H E C K L O X , ’ 169, Piccadilly, London, W .l Phone : REG ent 1900. August 9, 1946 E lectrical R eview 2 9 EQUIPMENT by ‘‘Walsall’’ means goodbye to th e dangers of vapour ignition, in Petroleum, Cellulose, Paint and similar works. Furthermore, "Walsall" offer a comprehensive range Remember: “ Walsall" Flameproof Equipment is thoroughly tested and Certified by the Ministry of Fuel and Power UUflLSflLL COnDUITS LTD - UUEST BROmUJICH • STAFFS August 9, 1946 3 0 E lectrical R eview And W E have got something to offer, too ! A service which has helped many a harassed buyer out of a difficulty. So, if you want small stampings or pressings for any purpose whatever our extensive range is at your dis posal— and it doesn’t matter a bit if you only want a modest gross, or an immodest million you will get prompt, careful, enthusiastic attention and an excellent job from us. • • • Tags, Terminals, Wiring Saddles, Cable Clips, Eyelets, Washers and Small Pressings, etc., for Electrical and Wireless Trades. r . Ilo w ler c sons a Constat a Thermostats MYSTO FOR ELECTRIC BLANKETS ELECTRIC AND HEATING PADS APPLIANCES • For the time being supplies are very limited indeed, but as materials and labour a become more plentiful we hope to get " Sews on like Button" back into our “ peacetime” stride .... Available stocks are being distributed as • fairly as possible. THE THERMOSTATIC CONTROLS FIRES • KETTLES • IRONS C O M P A N Y and SOLDERING IRONS • Proprietor» Sole Makers i R . E . THOM PSON & CO. (SUNBURY) LT D . W. T. FRENCH & SON LTD. AVENUE ROAD, HAMPTON, MIDDX. Telephone : MOLESEY 3285/6 “ MYSTO” WORKS, BIRMINGHAM 16 August 9, 1946 E lectrical R eview 31 result these figures, the •ng buyer ^ I S O h - P - ^ 1470 r P‘m' **■-• ,f^ tests d'SCerT on M.F.R ^ ^ r,ngm^ (oad. 92.5 9' .84 84 93.2- k d rnotors * * > % £ ' •* + * * * * r t » - > » Power F c\a\m 1° |nV/er running H„„„d ^ '»“I“®* ,W«! « = b*‘" ‘‘¿»»8. ‘“"“’„r.M « “ « "d in ,. preto»» M the", r ‘ , ta rd " r‘A ! hM°b ” iom. ■>«“ * M,y «• s'”a ’ r* 1 W e illustrate an M.F.R. 60 slip-ring m otor, 150 h.p., 960 r.p'm ., with slip-proof protection. THE HARLAND ENGINEERIN i f Branches at Manchester, Glasgow, COMPANY LIMITE Birmingham, Bristol. WORKS: ALLOA • SCOTLAN O o o Hull. Leeds, Newcastle, Nottingham, 8c Swansea. LONDON OFFICE: HARLAND HOUSE. 20 PARK ST.. W. I TELEPHONE: GROSVENOR 1221 E lectrical R eview August 9, 1946 3 2 Members of E.W.F. & R.W .F. IRON ELEMENTS s t o c k i s t s OF E.L.M.A. LAMPS C.M.A. CABLES b .v .a . v a lv e s PROMPTEST FACTORS 9 ( GREAT BRITAIN 1 u . ------"XT'------WARTON ROAD, STRATFORD, E.I5 (MARyland 6611) a i n t r e e r o a d , p e r i v a l e (PERivale 3300) Branches : Chester, Sheffield, Leicester Cambridge . Ipswich, Oxford, Croydon, Canterbury, Brighton, and Northern Factors Ltd., Crescent Rd„ Middlesbrough h a n d y , W e process Mica and Micanite pieces for many of qw ck'fittW ’ the largest Electric Iron and n 0 c o ld e r o > t c o l ^ Element Manufacturers. Approach us with your requirements and you are assured of personal and prompt advice. -i vd p in re-sale or 1 m /m Term inals are avai a ^ xeQUest. These 7 m/m i c List sent One of the specialities of LANGLEY LONDON LTD. 161 Borough High St., London, S.E.l Phone: G ra m s: HOP 2946 (5 lines) Laglycol, Phone, London HT2. 33 August 9, 1946 E lectrical R eview A RANGE OF 7> S fk u tS P/ESEL ELECTRIC SETS * F. Perkins Ltd., maintain a highly trained technical electrical staff whose services are at the disposal of enquirers. * Perkins Engines are designed for much higher speeds and much higher ratings than those used in their Generating Sets. •3» Perkins Diesel Electrical Sets are light in weight and thereby easily transportable. Starting can be by hand, electric motor, or automatic. P pQ P & 'A m S DIESEL ENGINES jrOR GOODS &HP PASSENGER VEHICLES, mpUSTRIAl »HD MARINE APPUOTIOlgJ F. Perkins Ltd., Dept.E.R, 73 Lincoln Road, Peterborough. Phone: 4201 E lectrical R eview ROTARY STRAINERS for CLEANSING CONDENSER CIRCULATING WATER Entirely automatic and selt cleaning. Completely enclosed. Airtight system maintained. Made in various sizes with capacities from 100,000 to 3,500,000 gallons per hour. h ic k H argreaves AND COMPANY U M ilt AD49 C Phone: BOLTON " H1CKGBOLTON ” 1373 (3 lines) CAXTON ITONIA METER — BATTERIES — BOARDS are AS SUPPLIED TO LEADING CORPORATIONS AND d e p e n d a b l e ELECTRIC SUPPLY COMPANIES All types of Lighting and Radio Batteries at Class “ A ” Prices ITONIA BATTERY Z?6 CAXTON WOOD TURNERY IT? 3-10 Leeds Place, Tollington Park MARKET HARBOROUGH. LEICS. LONDON, N.4. Tel.: ARChway 4311 /2 P h o n » 1 2 2 4 5 ( y Uwes ) Electrical Review, August 9, 1946 Through the streets o f COVENTRY i R o m p i o n p W /J d J rCHBLE CARRIES POWER TO THE CITY’S NEW HOMES ' "CTRA HOUSE. VICTORIA EMBANKMENT, LONDON, W.C.,2 Telegrams : Crompork. Estrand. London August 9, 1946 36 E lectrical R eview Lionel Robinson & Co. Ltd. 3 Staple Tnn London, W.C.I Telephone - - HOLborn 6 3 2 2 CASCAD E water COOLERS of Pojbur/ Condrudion CASCADE WATER COOLERS Ltd., Brewery Lane, DEWSBURY ^735 August 9, 1946 E lectrical R eview By Appointment to H.M. The King Suppliers of L i g h t i n g Switches is ¿eared, to essential needs w E should like to be able to accept every order we are offered 9 and to give our Trade friends the service they enjoyed in pre-war days. But that is not possible. The out put of our products is restricted by the availability of raw materials and suitable labour and since both are in short supply, our production must be allocated to orders for urgent and essential requirements. CRABTREE A * NAME • SYNONYMOUS • WITH • PROGRESS • IN • ACCESSORIES • AND • SWITCHGEAR “ Crabtree ” (Registered) C .608/84. Advt. of J. A. Crabtree & Co. Ltd., Walsall, England 38 E lectrical R eview August 9, 1946 The mechanism of the “ M U T A C ” SILVER CONTACTS silent A.C. switch is a complete breakaway from orthodox design. Switching is effected CONTROL SPRING through a silent cam-action. operating silver contacts with a gap of only •025". Housed in a sealed chamber, these contacts are ren dered free from dirt, moisture, or interfer ence. Outstanding advantages are • Silent action. • Long life— designed for 5 amps., tests show a useful life of over 100,000 operations at 100% overload, i.e. 10 amps. (B S. 1299 Part 1/1946 calls for 15,000 operations at normal rating.) • Positions of fixing holes and terminals, and size {2{" dia.) are all normal to facilitate Detailed leaflet S9868 available replacement of existing switches. upon request. MUTAC Îu M T C H id »«, of The General Electric Co. Ltd.. Magnet House. K .n « w .y , London. W .C.2 August 9, 1946 E lectrical R eview 39 Mechanical and Electrical properties Ley’s ‘ Black Heart ’ malleable has a high tensile strength and great ductility coupled with free machinability at high speeds. It is extensively used In many industries where strength and high resistance to shock are needed. In addition, it has a high degree of magnetic permeability with low hysteresis loss. L E Y ’S MALLEABLE CASTINGS CO. LTD. DERBY Black Heart Malleable a StanoCaÁd This illustration shows a number of the various types of W . & G. Lam p holders manufactured. A wide and compre hensive range of electrical accessories is available for essential purposes. WARD&GOLDSTONE Lt d . P ENDLETON. M 40 Electrical Review August 9, 1946 BRITANNIC CABLES <8 AN INDEPENDENT COMPANY, MAKERS OF E.H.T. AND L.T. PAPER MAINS CABLES, VARNISHED CAMBRIC C.T.S. MINING TRAILING, “ IVERITE ” INSULATED CABLES AND THERMO PLASTIC CABLES (P.V.C.) FOR 2S0 VOLT LIGHTING CIRCUITS FOR BUILDINGS OF ALL TYPES. BRITANNIC ELECTRIC CABLE AND CONSTRUCTION CO. LTD . IYER, BUCKS. Telephone : Telegrams : IVER 491 '* BRITANNIC, IVER. We Specialise in “CONTINENTAL TYPE” Accessories THE OVERSEAS ENGINEERING CO. LTD. C A BLES : MYCAMYN. 200 BISHOPSGATE, LO N D O N , E.C.2 PHONE : BIS 4810 & 6468 August 9, 1946 E l e c t r i c a l R e v i e w 41 t-And still the world*s nerve centre Verschnier's painting of the Fire of London, reproduced here by permission of Rischgitz Studios. I n 1666 London was devastated by accidental fire; and once again, in 1940, through enemy action, fire wrought destruction in the St. Paul s and Cheapside area, where, in Wood Street, stands one of the largest Automatic Exchanges, a nerve-centre of London’s telephone communi cations, and thus of the whole world. The fine new building suffered in the attack, but the Exchange now functions with unimpaired efficiency. No finer tribute could be paid to Alton quality and reliability than is done by the fact that two Alton batteries form part of this great engineering achievement. ALTON BATTERIES OF MERIT THE ALTON BATTERY COMPANY LTD., ALTON, HANTS Sole Suppliers of Fuller Stationary Batteries Telephone : Alton 2267 and 2268 Telegram s : ‘ Battery, Alton ’ A13/45 ^A ugust 9, 1946 E l e c t r i c a l R e v ie w WATERWORKS PUMPING PLANT he plant illustrated is installed In the Chertsey Pumping Station of the Woking W ater & Gas T Co., and typifies the outstanding qualities of Allen design of waterworks plant—compactness, accessibility and uniformity of design in respect of driving and driven units. The 12-hour rating of the 6-cylinder Diesel engine is 426 b.h.p. at 400 r.p.m., and the continuous day and night rating 385 b.h.p. at the same speed. The 3-stage double-suction pump has an output of from 3/l£ m.g.p.d. over a head range of from 365/301 feet »nd a speed range of from 350/1,040 r.p.m. A power take-off from the pump shaft drives a 50 kW . 230-volt direct-current generator which provides power for auxiliary plant, including a vertical river water pump having an output of 3 m.g.p.d. against a total head of 50 feet. The Engine, Pumps, Generator, Switchboard and Auxiliary motor-driven pumps are all of Allen construction. The main pump is particularly interesting as it is a multi-stage pump of the double-suction type which sets up no hydraulic end thrust and consequently an automatic balancing valve or thrust bearing is not necessary. The accessibility which the horizontal split on the pump casing gives is readily observed. Allen waterworks plant Is efficient, reliable in operation straightforward in design and simple to operate. Above all, it secures uniformity in standards of design and performance down to the smallest detail. August 9, 1946 E l e c t r i c a l R e v ie w 43 "I RECKON IT WILL PAY TWICE OVER A W ELL-PLANNED and executed LIGHTING A ll concern- lighting scheme pays dividends in two ADVI SORY ed with the C F R V I C E installatwn 5b K V I L b orrenewai of directions. Employees visibly respond to lighting are invited to com municate with our Lighting Advisory Service, Bridle better seeing conditions — suffer less Path, W atford. Telephone : W atford 7701-08 fatigue, work more accurately, more cheer fully. The sub-conscious effect on customers is reflected in increased sales. LAMPS IN FITTINGS The British Thomson-Houston Co. Ltd. Crown House, Aldwych, London, W.C.2. August 9, 1946 44 E l e c t r i c a l R e v ie w L e w c o J ^ INSULATED WIRES & STRIPS have preserved their sixty-six years’ reputation forextreme accuracy over the whole range of winding w ire sizes, regardless of changes in insulations THE LONDON ELECTRIC WIRE COMPANY AND SMITHS LIM ITED, LEYTON, LONDON, E.10 August 9, 1946 E l e c t r i c a l R e v ie w 45 n o w DISTRENE foil Radar, one of the most epoch-making inventions of this century, would not have been possible without the help of a material possessing a very low power factor, a high resistance to moisture and great dimensional stability. D ISTR EN E Regd. (Polystyrene) was the material that completely met these needs. Power Factor Now, in the change over from war to peace, you have your problems of high-frequency radio and 0-0002-O'0004 electrical insulation. D ISTREN E FOIL can help Tensile Strength you to surmount them. 10,000 lbs/sq.in. In DISTRENE FOIL (Orientated Polystyrene Thickness Film) the molecules are specially arranged during 0-001" to 0-008" manipulation so that the tensile strength is in creased by 3 times and the flexibility by io times. ★ ★ ★ BX PLASTICS LTD LARKSWOOD WORKS * LONDON • E.4 Telephone: Larkswood 4491 Branches: King Street Buildings, I Ridgefield, Manchester, 2. Telephone: Manchester Blackfriars 0258 42 Wellington Street, Sheffield. Telephone: Sheffield 25517 Works : London, Manningtree and Dundee TATI.OR GG5 E l e c t r i c a l R e v ie w August 9, 1946 When you look into the pattern of switchgear development at Crompton Parkinson, Ltd., you find that design and experiment are closely interwoven at every stage. Every important design decision is based on practical data from research in the full scale testing station. As members of the Association of Short-Circuit Testing Authorities the Company carries out official proving tests. But with Crompton switchgear the early use of the test facilities has made the result already certain. CROMPTON SWITCHGEAR DESIGN BEGINS IN THE TEST STATION CRomPTon pnRKinson L I M I T E D EtECTRA HOUSE VICTORIA EMBANKMENT, LONDON W.C.2? August 9, 1946 E l e c t r i c a l R e v ie w 47 W H ICH i s W HICH t You KNOW. but do your customers know ? To follow the “ Safety First ” recommendation, make sure your electrical leads, whether to Domestic Appliances or to Machine Tools, etc., are clearly defined. “ Viskrings” simply slipped over the core-wires and/or the outer casing of the leads do the job and put an end to confusion or doubt. • No Tools required • No rubber used • Impervious to oil and petrol • Indelibly printed • Supplied in all colours as well as white • Self-fixing • Do not increase diameter of lead for PERMANENT IDENTIFICATION OF ELECTRIC LEADS VISCOSE DEVELOPMENT CO. LTD. Woldham Road, Bromley, Kent. | ’Phone: Ravensbourne 2641 August 9, 1946 48 E l e c t r i c a l R e v ie w m s § » B c n o » r Unit-Type Metaiclad Distribution-Gear S i m p l e f o e t o e c i a t t d e x & n d REYROLLE HEBBURN-ON-TYNE ENGLAND A u g u st 9, 1946 E l e c t r i c a l R e v ie w 49 W ith J & P Boxes, of course ! JOHNSON & PHILLIPS LTD. .CHARLTON ^ LONDON S. E.7 Iks M Jik tkd MLCMÎ ikd IM l m C tliifi QucJdu,------August 9, 1946 50 E l e c t r i c a l R e v ie w Adaptability and ease of fitting are two of the outstanding features of the Consumer’s Service Unit. The supply intake, main switch and consumer’s fuse chambers are in one compact assembly and can be arranged to suit all conditions ; this also makes the work of supply authorities and contractors much easier by eliminating a diversity of apparatus and tortuous wiring. Full details are contained in our publication N0.204B. CONSUMER S e r v i c e BRITISH INSULATED CALLENDER’S CABLES LIMITED NORFOLK HOUSE, NORFOLK STREET. LONDON W.C.2 August 9, 1946 E l e c t r i c a l R e v ie w 51 S M A L L E R - lighter - more versatile than ever - with a choice of 100 different speeds between 90 r.p.m. and 5 revs, per hour; three- phase, D.C., and Universal motors ; all without change n n f l d l J y i e c o of dimensions. 1/8 h.p. at the final shaft G E A R E D I 1 1 0 T 0 R at 26 to 90 r.p.m., and 25 lbs. ft. at lower speeds. Oil- A, ^ immersed silent spur gears ; oil-sealed gear box ; ball ^ bearing famous NECOmotor. Unfortunately delivery °> takes time, but it’s worth a * small delay. NORMAND electrical company ltd. North Street, Clapham Common, London, S.W.4 Telephone: MACaulay 3211-4 August 9, 1946 52 The production o f a slip ring mounting and base for a potentiometer. Two silver wires 0.02 diam. are brought out from the silver slip rings to the side of the mounting. The base incorporates six »5 s w.g. tinned copper connecting leads brought out to the side. (See X-ray photograph.) ------ Slip ring and base mouldings were developed and produced by P. X. Fox Ltd., Horsforth, in bakelite Material X .11055. — solved by moulding in BAKELITE MATERIAL Here is a job that is obviously one for plastics. To build up the potentiometer from machined components would not only be an extremely difficult task but the result would not be comparable with that obtained by the use of b a k e l i t e Plastics. Plastics should be used only on the right jobs, but even more important is the choice of the right plastics. TREFOIL BAKELITE EDITORIAL, ADVERTISING & PUBLISHING OFFICES : Dorset House, Stamford St., London, S.E.I Telegraphic Address : “ Elecrev, Sedist, London.” Code : ABC. Telephone No. : Waterloo 3333 (50 lines). Registered at G.P.O. as a Newspaper and Canadian Magazine rate of postage. Entered as Second Class Matter at the New York, U.S.A., Post Office. Annual Subscription, post free : Great Britain and elsewhere (except Canada), £2 7s. 8d. ; Canada, £2 3s. 4d. Cheques and Postal Orders (on Chief Office, London) to be made payable to ELECTRICAL REVIEW LTD., and crossed ” Lloyds Bank.” K n n c D 'S' TYPE ELECTRIC HAMMER The lighter ttammer I(tr the Lighter fc The new 'S ' Type Kango Electric Hammer has been introduced to fill an essential need fo r a light yet powerful hammer designed to stand up to hard and continuous wear. The most im portant feature is that because of its light weight it can be used for all ceiling w ork where the larger and heavier hammers may be too cumbersome for the workman to operate. For the electrician and maintenance engineer this hammer is particularly useful for all Rawlplug and sim ilar w ork, its speed in drilling is phenomenal having regard to its light weight. The hammer can also be used for light cutting away, hacking, brick raking and boiler scaling, etc. Knnco flee trie ttam m ers L t d . MORDEN FACTORY ESTATE, LOMBARD ROAD, LONDON, S.W.I9. Agents throughout the United Kingdom 54 Electrical Review August 9, ^ ° Portable “ OMNI-RANGE ” CURRENT TRANSFORMERS Universally Applicable Current Transformers 0 Currents from \ amp. to 2,400 amps, can be measured on a single transformer. % Complies fully with B.S.8I for any desired class. % Test voltages of 10 o r 20 kV and secondary currents of 5 or I amp. are standard. 0 A secondary short-circuiting switch is fitted to all models. Dwarf Omni-Range Transformer 0 A compact multi-range transformer for general testing, giving the following eight ranges : 0.5, 2.5, 10, 25, 40, 50, 100 and 200 Amperes. Write for Catalogue Sheets 417 and 439 Manufacturers of all kinds of indi cating and recording electrical instruments. Photometry experts. EVERETT EDGCUMBE COLINDALE WORKS LONDON, N.W.9 Telephone: COLINDALE 6045 f . ssjwlJT E l e c t r ic a l R e v ie w t h e OLDEST ELECTRICAL PAPER - ESTABLISHED 1872 Vol. CXXXIX. No. 3585. AUGUST 9, 1946 9d. WEEKLY r Technical Colleges ECHNIKsj Research by Teaching Staffs ECR.UITMENT of men in all walks sultants in a letter to The Times appear K of life of the high type required by the to have inferred that subsidized research electrical industry has been for some years would be undertaken for the sole benefit a major preoccupation of its leaders. of a single firm, whereas the results of Hence the amount of thought and attention research at educational establishments that is being given to the education and should be freely available to industry as a training of entrants into its ranks. whole. If results exclusive to any par A prime need is for teachers of the right ticular body are desired, recourse should calibre. That means more than the surely be had to independent consultants, holding of high academic qualifications, whose vitalizing function was never more more even than a gift for imparting important than it is to-day with the information. In technical colleges more prevalent tendency to large-scale organiza especially it implies possession not only of tion. Some safeguard of their position is a capacity to form clear ideas as to the to be found in the proviso of the circular manner in which their instruction is that members of teaching staffs acting as eventually to be applied but also of the consultants shall be competent to do so. power to instil confidence into engineering students (who usually have a practical bent) Lack of Practical Knowledge that their mentors have this aptitude. The average teacher, the signatories This would of itself give justification stated, generally lacks the practical enough for the valuable exercise gained in knowledge of industry, especially in its the carrying out at colleges of applied economic aspects, which is an essential research along avenues that seem likely to qualification of a technical consultant. lead somewhere. Industrialists concerned largely with pro duction efficiency may be expected to be Teachers as Consultants alive to this requisite and public bodies are Some such considerations may be well advised to give full scope to a form of assumed to have influenced a recent circular private enterprise to which there is of the Ministry of Education recom probably no doctrinaire objection. mending that the teaching staffs of technical It seems to us doubtful whether the colleges should engage in research at the independent consultants’ case was fully instance of industry. The Ministry went answered by an admirable statement of on to suggest that fees payable should be the views of the Institution of Electrical allocated by pre-arrangement between the Engineers which appeared over the signature individual and the college authorities and of its secretary, Mr. W. K. Brasher, in a also that staffs should be encouraged to subsequent letter to the same journal. This act as consultants to industry. statement concluded by advocating the re In taking exception to the last recom muneration of teaching staffs for research mendation, a group of independent con carried on outside their teaching hours— August 9, 1946 206 E l e c t r i c a l R e v ie w instead of erecting an entirely new a proposal that calls for amplification in Details of the scheme are given i detail before its merits can be appraised issue and from these it w ill be seen th but the question of acting as consultants to is hoped to have the first of two 60,00ui industry was not touched upon. Care would sets in operation in less than two> and be necessary lest the incentive of seeing half years, whereas it would be four year some useful line of applied research put before a new station could be go. 8om£ into production presented greater attrac The two new sets w ill cost £2* m i ion tions to teachers than the casting ot seed while a new station would cost £4 million upon the oft-seeming stony ground o and in this way the Edinburgh undertaking s students’ minds. Research undertaken m consumers will be saved an expenditure technical colleges should have as is of as much as £200,000 per annum for primary long-term object the training o twenty years. engineers, its value to industry being merely a commendable by-product. Q u o t i n g from “ Meteor- Space-heating ological History and the S e v e n t e e n years have Calculations Space Heating Machine, Electricity’ elapsed since the Electricity Calcuiatio ^ r Grierson (Institution Tariffs Commissioners appointed the last committee on elec of Mechanical Engineers, 2 s 9d. postTree): “ Warmed buildings should no longer tricity charges and tariffs, under the chair regarded as receptacles for unknown manship of Mr. A. C. Cramb; there had been an earlier one in 1925. Now the quantities of valuable heat „ appointment of a further committee is is due to the author, as M r. R . A b. announced with Sir John Dalton as chair Thwaites pointed out at the l.M.t.A. man. The keynote of the terms of reference Convention last month, that heat require of the 1929 committee was uniformity; ments can now be calculated on a scientific this time uniformity and development are basis. The practical aspects o f the degree- the considerations. A link between the day method as demonstrated on the North- last committee and the present one is met system have been described by Mr. provided in the person of Mr. H. Bentham Grierson in our columns. The new docu who again represents the Provincial Electric ment, which contains a considerable amount of hitherto unpublished basic Supply Association. data relating to extremes of temperatures U n d e r the 1926 Act, in addition to average values for a long Central by which it was term survey, is commended to the favour Board established, the Central able attention of electrical space-heating Electricity Board was em Finance engineers. powered to borrow up to £33£ million and by 1941 the limit had A t the time o f the been raised to £70 million. Now approval B.E.A.M.A. advertisement for a suc- has been given to a Special O rder by v/hich Directorship cessor to Mr. Victor Wat- the Board’s borrowing powers are increased lington as director o f the to £100 million, thus trebling the original British and Allied Manufacturers Associa amount. At the end of 1945 the Board tion, we mentioned that the post was one had about £3 million of unexercised requiring very high qualifications and borrowing powers so that with the sanc experience. In selecting Mr. B. H. Leeson, tioned increase it will have £33 millions of Reyrolles, for the position the Council to play with. Estimates for the period of B.E.A.M.A. has undoubtedly chosen ending with 1950 show that £26-6 million well, for Mr. Leeson (better known as will be required, mainly for extensions of Colonel Leeson) has had long service in the grid but also for the Board’s station at the industry and although his principal Earley and other purposes. w ork has been in connection with high- Considerable econo voltage switchgear he has been prominent Portobello mies in time and money in a company with varied interests which has given him a good all-round experience Extensions w ill be achieved by the decision arrived at by the of electrical manufacture. Apart from being technically equipped, he has an Edinburgh Electricity Department to clear excellent administrative record both within out old plant in the Portobello power the industry and in wider circles. station and install modern generating sets August 9, 1946 E l e c t r i c a l R e v ie w 207 Evaporated Milk New Processing and Canning Factory W M 7 IT H the threatened reduc- ■ ■ tion in fresh milk sup plies next winter, condensed and dried milk are again likely to play an important part in our diet. To meet the situation, factories all over the country are now busily engaged on pre serving large quantities of milk. At a new works at Whitland, near Carmarthen, Wilts United Dairies, Ltd., are producing as many as 80,000 16-oz tins of unsweetened evaporated milk a day, and in addition the com pany distributes a large quantity of fresh milk daily. The milk is collected in churns by lorry from about 3,000 far^is situated within a radius of fifty miles, on an average Condensing plant at the W hitland, Carmarthen, factory of W ilts United Dairies, Ltd. and automatically weighed. The empty churns continue their way on another chain conveyor (2-H.P., 940-r.p.m. motor) to two tunnel washers (10-H.P., 1,440-r.p.m. motors) where they are washed, steam sterilized and dried at a rate of 600 an hour on each of the machines. From the re ceiving tanks the milk is taken by This 100-H.P. com means of an 8,000 pressor employed gal per hour pump, for milk cooling is shortly to be dupli with a 9-H.P., cate d 1,440-r.p.m. motor, through a brine 53,000 gallons be cooler (operated by ing handled daily. f Unloaded from Fluorescent lamps the lorries, the are used to light the four stacking rooms, churns are carried each one of which on a chain con hold s 330,000 tin s veyor, which is driven by a 6-H.P. 950-r.p.m. Lancashire a brine circulating pump with a 6-H.P., 1,440- Dynamo totally enclosed motor with E.A.C. r.p.m. motor), which reduces its temperature starter, to the receiving tank where it is tipped to approximately 40 deg F, ready either for August 9, 1946 208 E l e c t r i c a l R e v ie w dispatch in 3,000-gal glass-lined railway steel collecting vessel at the tanks, for storage in two 3,000-gal tanks J ° " s jn the evaporator are extracted while awaiting dispatch or straight to the ^ ofa pearn dry vacuum pump driven condensery for treatment. In the cond®"*e^ ¡ 15. H.P., 715-r.p.m. slip-ring induction the milk goes from the cooler to six 3,000-ga y ^ a Worthingt0n Simpson surface storage tanks, where the cream is prevented from separating out by means of agitators con ens . coilectjng vessel the milk is (4-H.P., 1,440-r.p.m. motors) «ht.lii t o » « „ Z r n o j m t « * » continuously through the milk. From the gra y storage tanks, the milk is pumped with the aid of 3-H.P. 1,440-r.p.m. motors to recirculating tanks, where it is pumped (20-H.P., 1,436-r.p.m. motor) through a Peebles stainless steel steam heater. A n automatic float switch which is incorporated ensures that the recirculating tanks are kept full. Leaving the heater, the milk passes to the “ hot well ” and is then delivered to the . Peebles continuous* Tins are filled an^h^e^led^au^U>rnaticaUy ^th^e° evaporator working X eL T 0r which h is capable of dealing are operated through reduction g ^ a r ^from with 33 000 lb of liquid milk per hour, is of 32-H.P. motors running a , ,he - double effec, ” type, .he milk being In i.s fina! form coolers, which reduce its tem perature to 40 deg F , to four 3,000 gal storage vessels. These are kept agitated by means of impellers. Inspection lamps are provided to enable the operator to keep an eye on the product at all stages of manufacture. These storage vessels, incidentally, are of glass enamelled steel construction. Finally the finished product is passed to the filling machines. Though two of these machines are provided only one is used at a time, the other being kept as a standby. Each machine is capable of automatically filling . . , and soldering tins at a rate Before canning, the milk passes through homogenizers to ensure that the cream is distributed equally Oí 136 a minute, tO give an output of 80,000 tins a day. distributed in a thin film passing downwards • Leaving the filler, the tins áre carried along a throneh the calandria tubes, and from the conveyor to a testing bath where imperfectly evaporator the product passes to a stainless soldered ones show bubbles and where only August 9, 1946 E l e c t r i c a l R e v ie w ¿09 ing machines are pro vided, as well as a box wiring machine. A final belt conveyor carries the filled boxes up to the dispatch department. When the condens ing plant is in opera tion and steam is required for process work a 250 - k W Lancashire Dynamo alternator driven by a Beiliss & Morcom steam e n g in e is After sealing, the tins go to the sterilizer partly filled ones float. Steam is used to dry the tops of tins ready to receive the batch number before they continue on another con veyor en route for sterilization. The filler and conveyor operate as a single unit and are i driven by a 3-H.P., 715-r.p.m. motor. The sterilization process is carried out by means of a continuous machine (Mather & Platt) consisting of three cylindrical units, a bringing-up unit, sterilizing unit, and cooling unit. The tins are carried around each unit by a slowly rotating spiral trackway and are there processed under counter pressure. An inclined conveyor takes the tins leaving the cooler up to the stores where further horizontal cable conveyors feed four compartments pro Us viding accommoda tion between them for 1,320,000 tins. A fluorescent light ing installation over Us the storage space Automatic nailing facilitates stacking. machine for putting From store the tins the lids on the can be speedily fed packing cases Éi to the labelling brought into ser Ü® machines which can vice, and to provide handle 250 tins a additional steam isedi minute, and they and generating cap are then packed by acity two further line 85-kW sets are now fill being i n s t a l l e d . Labelling the tins is undertaken at Steam is ini the rate of 250 a to dri m in u te fin monia ngi for the ecti hand into cartons or wooden boxes holding there is in addition an electrically oil! forty-eight tins each. Box making and nail- (with a 100-H.P. motor) which A u g u st 9, 1946 E lectrical Review nu& ¿ 10 L t d . supplied by the City Electric^ e of Lanca- be duplicated. The boiler plant comprises Practically all the motors used tion with two super economic units equipped with shire Dynamo & Crypto cons p c o n di- 15-H P and 7-H.P. motors driving the induced E.A.C. starters. In view of th has been draught fans and 1-H.P. motors driving the tions prevailing all the wi * ;nSulated s to k e r s . . carried out with Pyrotenax miner When the process steam is not required cables. . wilts United for condensing purposes, the electricity We should like to th ^ wor|cs supply is taken from the West Cambrian Dairies for permitting us to ager of the Power Co., Ltd., the two supplies being and also Mr. L. C o le m » ™ ” | in K ,, f „ connected in parallel. The maximum demand works, and Mr. G. on the power company’s supply is about their help in preparing this 220 kW. The substation switch-house was New ltK. t.n.A. Director Appointment of Mr. B. H.. Leeson At the close of the 1914-18^war M rL^son Electrical and EMAHE Council of the British had been transferred to the Tyne Electrical Allied Manufacturers' Association nas Engineers, which unit he commanded when war aDDointed Mr. Bruce H. Leeson, O.B.E., broke out in 1939, and he assisted in planning M I E E to be Director of the Association as the A.A. defences of the district. Early in 1940 from October 1st, 1946, in succession to Mr. he was released from military duties to take up the position of general manager of Reyrolle s. V Mr^Leeson, who was born in Surrey, served When Mr. Norbert Merz, chairman of the an apprenticeship as a premium pupi company, retired early in 1945 and Mr. George eained the City and Guilds honours grade W ansbrough took his place, Mr. Leeson became certificatein electrical engineering at Battersea managing director. In the following year he Polytechnic. He then joined the board of the Consett Iron Co., Ltd. joined Siemens Bros. H e is a lso a d ire c to r o f E .R .A . P aten ts, Ltd., Dynamo Works, Ltd., and Morphy-Richards, Ltd. and took part in high- Mr. Leeson has been responsible for many voltage switchgear p ap ers an d lectu res g iv en o n en gin eerin g subjects development. here and abroad, and he has been very active in In 1914 Mr. Leeson connection with various societies linked with was called up as a Terri the industry— among them the North-East Coast torial and served in the Institution of Engineers and Shipbuilders and Divisional Engineers of the Institution of Electrical Engineers (he was the Royal Naval Divi chairman of the North-Eastern Centre in sion, a unit sponsored by 1930). He has just been elected to the l.t.t. the I.E.E. In 1919 he C o u n c il. , accepted an invitation His administrative ability is equally demon f r o m M r. H . W . C lo th ie r Mr. B. H. Leeson strated by his varied advisory positions and to join A. Reyrolle directorships. He is actively connected with & Co Ltd and he formed a technical and organizations engaged in converting the North- research department for the company He was East Coast from a “ depressed area ” into a intimately connected with the establishment of “ Development Area ” for industry. the first short-circuit testing station in Great In addition to all this technical and adminis Rritain in 1929, and subsequently with the trative work, Mr. Leeson finds time to enter standardization of switchgear performance into many social forms of service; these are not which enabled certificates of rating t°.be .,**ue‘j; limited to— the— ------normal recreative’ '-'•‘ '-auve a affairs n a irs 01 of mshis This involved concurrent standardization of company, for he is on the Council of the Tyne ,11-hreakers bv the B.S.I. and the I.E.C., side Council of Social Service. n.~ . ____ and Mr. Leeson represented this country at awarded the O.B.E. in 1940 the meetings which resulted in the I.E.C. Pub , V " 1‘ "7U> ar>d later was appointed honorary colonel of the Tyne Electrical r „ No 56 in 1937 and B.S. 116. He was Engineers, a position which he still holds Catso closely deesAandChe is a director of the British Short- Glasgow Engineering Exhibition A.n exhibition embracing all C i n U ittheeStrentire m e n tn o f M r. C lo th ie r fro m engineering components relating to ®sPects of On the ret ;n 10^7 M r L e e s c n electrical, optical, scientific and T,echanical, struments and tools is to be held in ,?r*ne in‘ Hall, Glasgow, from November 1 5 t h . K elvin to 27th. A u g u st 9, 1946 E l e c t r i c a l R e v ie w 211 i i in the circuit have a much higher impedance at ripple frequencies than at 50 cycles, whereas KI liipple Control capacities of cables and power factor correcting WI 4 CENTRALIZED control of distant street condensers have a reduced impedance at audio a i or shop lighting, off-peak water heating frequencies. The ripple voltage distribution tat and tariff changing for two-part metering is therefore tends to vary somewhat depending on sik described in some detail in a G.E.C. brochure the variations of the 50-cycle load, but is super which illustrates the valve amplifying and imposed over this 50-cycle voltage and any relaying equipment and explains the general I)® appliance connected to the mains acts as a load principles of the system with the aid of circuit K » also on the ripple amplifiers. In the ripple diagrams. Pilot wires are not needed ; instead relay there is a filter circuit which has a high SSi: a.c. ripples of musical frequencies (between impedance to 50 cycles and a low impedance at 9W, 300 and 800 c/s) are injected into the mains ripple frequency. network for actuating tuned relays at the distant switching points. The G.E.C. system is suitable for both a.c. and d.c. networks; the signals can be injected I.M.E.A. and the Register If into either the low or high voltage side of an ■7INGINEER representatives of members of a.c. network; the same type of signal is used the Incorporated Municipal Electrical throughout; more frequencies can be added Association have been sent copies of a report without any alteration of or additions to relays w1h.li prepared by Mr. E. A. Mills (Hackney) and already installed; the receiving relays cannot Irak Mr. R. Birt (Ealing) dealing with the present get out of step; the system is independent'of Qüïkiît position of the National Register of Electrical the strength and duration of the signalling M it Installation Contractors and the steps which current between very wide limits; it is also ici là i they consider to be necessary to strengthen the independent of the state of the neutral organization and thereby assist in improving conductor insulation. the general level of installation work throughout Demonstration equipment at Magnet Elouse the country. includes a six-frequency master unit comprising The report reviews the history of the Register 45 süàMi.G the control push-button set and oscillator; and recounts recent events, including the Mi.te two 150-W amplifiers and injection transformers ; decision of the Electrical Contractors’ Associa Î foftoiTK? and various types of ripple relays for the tion to advise members to withdraw from the asenIsnCi six frequencies. The master unit in the show Register and the rejection by the Ministers of LRAte room in the basement is arranged to transmit Works and of Fuel and Power of suggestions audio-frequency signals to an injection trans that legislation instituting compulsory registra rspossbkH former and amplifier connected to a special tion should be introduced. fflfiffisasi- showroom display, or alternatively to another This leads up to proposals for securing the as fcaw!s transformer and amplifier installed in the support of I.M.E.A. members for the Register iûàefefe Magnet House substation. and the following recommendations are made :— aibeMfc (1) That when advertising for tenders for isdS# Area System in Miniature installation work, a clause should be inserted The showroom display simulates conditions stating that tenders are invited from contractors in a small area fed by a power feeder and who are on the Register. indicates in model form the simplicity with (2) That when inquiries are made in writing which signalling may be carried out. Connected or in the showrooms for advice with regard to ilifej 6 S' to the model are relays tuned to various fre electrical contractors, registered contractors quencies to operate lamps and all operations are ad*5 *- should be recommended. iiaVil) S6 visible to the observer. A simple change-over (3) That where lists of electrical contractors convent} circuit enables the output from the master are kept in showrooms for handing out to 'ressec 3 unit to be transmitted to the amplifier in the consumers, they should include only registered Magnet House substation and the signals are industr contractors. ■hnicil is- then radiated over the whole of the 50-cycle (4) That where the authorities themselves mains network and may be picked up in any fifldj ws carry out installation work, they should apply nice; ite office of the building. for registration. A portable relay is available for detecting ’T/Ve afe The I.M.E.A. Council strongly commends the signal by connection to an ordinary power mciloIk these suggestions to the favourable consideration point The relay will receive the ripple signal Mr. La of members. and las of a few milliwatts without being disturbed by a Ty/reft the parallel connection of an appliance con 77/AoMi suming more than a 1,000 W. The explanation Mobile Canteen Helps E.I.B.A. is that the ripple power injected into the mains In 1941, the electrical industry of Leeds is calculated to produce a few volts on the presented to the A.R.P. authorities in the city hibitioi total impedance of the power network, which i mobile trailer canteen. This has -nnw heen aspects calculation must take into account the different .old and the committee responsib'" mechm impedance of consumers’ apparatus at ripple he proceeds amounting to £128 Tiarine frequency. For example, coils, machines, etc., Electrical Industries Benevolent the Kil to 27th August 9, 1946 212 E l e c t r i c a l R e v ie w Views on the Views Reflections on Current Topics , ^as a reputation ■ N interesting, but belated, echo of the Middlesbrough, 1.am to in th r strikes at at Barking Barking and and Littlebrook Littlebrook for supplying decision in favour of in NM l a yv appearsappears in in the July July ElectricalElectrical Power Power country,” so that.thet dec noteworthy 1 in May appear in f 0 mwt;no electricity is Pa“ lcu‘,nL on the subject Engineer in the form of a report of a meeting confess to » m e met seem tQ of the Combined London Sections of the Electrical Power Engineers’ Association he c of gas charges few P P although quite in June From this I gather that the National know what they P y tr:r;fV charges. The Executive Council of the E .P .E .A . instructed au fa it with their e e ]jtrlating at Middles- 3 - 51 d. per therm for street lgnung members to carry out their own duties and brough, however, is obvious y responsibilities only during the dispute which was described as ‘ unofficial. Ihe meeting, by a large majority, passed a Electrical enthusiasm in the young is to resolution “ deploringdeploring” tnethe cuiuituCouncils > action febe encouraged,encouraged,, butbut. in a case wh.chwmv.. has as its effect was to place the members con- cQme gnotice six Wolverhampton boys cerned “ in a position where loyalty to he haye overstepped the mark. They Association and the higher loyalty to the sajd to haye se(. up ^mature power national interests could not be reconciled. stations ” in the ■ - -i~j sheds— of r their homes with A further motion condemned all unofficial equipment (valued at £100) stolen mainly strikes, the opinion being expressed that it from Wolverhampton Corporation Electricity should be incumbent upon every member to Department. Apart from the reprehensible do his utmost, either by voluntary assistance, manner by which the equipment was ob or by supervision of such assistance, to tained, the danger from electric shock of maintain electricity supplies.” such experiments is obvious and might well * * * have involved others besides the boys themselves. It is to be hoped that the A few weeks ago I referred to the germicidal fine of £2 which was imposed on each of the qualities of ultra-violet rays. Now 1 hear boys will have the effect of guiding their from America of another electrical develop youthful enthusiasm for electrical experiment ment which will form a valuable accessory into more legitimate channels. to installers and users of u.v. apparatus tor * * * this purpose. This is a portable electrostatic air sampler for counting disease-spreading Stories appeared in the daily press last airborne bacteria. Armed with this device, week of a thatcher who threw a metal-bound which weighs about 12 lb, it is possible not tape over a haystack on to an 11-kV line in only to check the effectiveness of germicidal the course of his duties. Tie received a shock lamp installations but also to compute but was pulled aw ay w ith no further injury reasonably accurately the amounts of u.v. than burns. He is stated to have said that energy needed to keep airborne bacteria the experience seemed to have improved his reduced to the minimum. asthma. “ Kill or cure ” certainly appears * * * to be appropriate to a remedy of this kind. I am glad to learn from the August From Australia comes a report that two Electrical Contractor that the E.C .A . Melbourne m edical students have . been Technical Committee has reminded electrical working on an “ electric anaesthetic.” A contractors of the part which they can play doctor who took part in a test is alleged to in reducing radio interference when con have remarked that “ while the current was sidering the installation of wiring and on patients were put to sleep, from which onnliances The Committee suggests the they awoke without ill effects when the screening of wiring systems in blocks of flats. current was switched off.” I aw ait further Generally, anti-interference measures will be details before my next visit to the dentist. annlied to apparatus and this will usually * * * be the responsibility of manufacturers. A news message from New York ic Leaded “ General Mills to Make Home AnnLnres” The picture thus suggested of a gallant officer *»»>tl“ 'elX c n’st«M f e g Uf» beating his sword into an electric v J t t t l k Ye, •» dispelled by the text of the note 5 • that an American food products SlOWin^ is to use its wartime plant for the nrC0,rnP an^ S,ia„eT / f S , bio n S= of electrical and other domestic an°ructlon in mSst cases there is a P rrt, nces. d e f l e c t o r . 213 A u g u st 9, 1946 E l e c t r i c a l R e v ie w Power-Factor Correction Calculations for Ascertaining Values for Induction Motors By H. Neale H E N considering power-factor correc The wattless k V A at three-quarter load = tion by static condensers on individual full load efficiency , motors, it is frequently useful to examine0 /5 K x three-quarter load efficiency W In the majority of cases, the three-quarter load three conditions by calculation, instead of employing the graphical method of solution, efficiency is the same as the full load efficiency; at Mia especially when dealing with vectors of small hence for simplicity the above may be i k value. A high degree of accuracy can be written: Wattless k V A at three-quarter load = attained with six-figure trigonometrical tables. 0-75 K tan fa .'. 0-75 K tan — K (tan 4> - The three cases are :— tan fa ) = wattless kV A at corrected p.f. = A. To ascertain the corrected p.f. at frac 0-75 K tan A R E P O R T published By W. D. Kennedy, B.Sc.Tech. obtained from English dairying counties is justi - c A . for the Ministry of and G. O. M cLe an , M.Eng. Agriculture and Fisheries fied, so that the truth may (H .M . Stationery Office) entitled “ M ilk in be made known to our own industry and the North America ” was issued almost at the Ministry of Agriculture, which must bear same time as editorial comment (July 26th) responsibility for the false implications in was made on the facts brought out by the report. Mr. C. W . Kellogg in his presidential address The report quotes an extract from “ A to the Edison Electric Institute about rural Guide for Members of R.E.A. Co-opera electricity in America. The report is the tives ” and sets out the charges to be made to result of the visit of a British mission, led a farmer member for a month’s consumption by Mr. J. L. Davies of the Milk Marketing of electricity totalling 296 kWh. The total Board, to study American and Canadian monthly cost is given as £2 13s. 6d., an methods of milk production and marketing. average cost of 2-2d. per kW h. The tariff The editorial note quotes M r. Kellogg’s is, of course, a block tariff, commencing statement about Government propaganda with a block of 40 kW h per month at a making rural electrification the subject of minimum charge of 16s., an equivalent of controversy between the Rural Electrifica 4-8d. per kW h. The next 40 kW h are tion Administration (R .E .A .) and the elec tric companies and, \l by implication, be \v I \ littling what the com I v panies have done. The \ \ \ \ British mission appears \ \ to have swallowed the \ \ / propaganda hook, line / f and sinker, as it de / votes an appendix of ------TY PICAL R.E .A. TARIF four pages to the BR ITISH TARIFF (FROM 100 FARMS) R .E .A . and one of the official recom mendations (No. 6) is that “ Special efforts k W h PER ANNUM (THOUSANDS) should be made to provide the dairy farms Comparison of British and American prices for the supply with an adequate and of electricity to farms cheap supply of elec tricity.” The implication surely is that sold at 3d., the next 120 at lid ., all over America has a cheap and abundant supply 200 k W h per month at lid . per kW h. and this country has not, and that in America As it is difficult to make direct comparisons the R .E .A . has been the means of providing between a block tariff and the normal two- it. The report states that “ There is no part tariff used in this country, the American doubt but that the service in the United figures have been put into graphical form, as States and Canada gives satisfaction. It is shown in the figure. The consumption and cheap, and as far as we could gather, it is revenue figures for fifty farms in the Shrop not subsidised apart from loan capital.” shire Company’s area and fifty farms in the W hile leaving M r. Kellogg, or his successor, Wessex Company’s area (these include the M r G r o v e r C . Neff, to defend the company dairying counties of Hereford and Wilts) interests a g a in s t the R .E .A . insinuations were available to the authors and the hundred and infiltrations, we feel that a comparison results were plotted, each as a dot, on the between R .E .A . rates of charge, as outlined same curve as that showing the R .E .A . tariff. by Mr. Davies’ mission, and some figures) Because of the different fixed charges and A u g u st 9, 1946 216 E l e c t r i c a l R e v ie w varying consumption up to 25,000 kWh in a energy, his average price would be reduced year, the dots were scattered so a smooth to 1-91 d. which is still considerably higher curve has been drawn to give the nearest than the English farmer pays fit. It is below the R .E .A . curve all the The report concludes with an example way. an REA. Co-operative Association, and It may be more convincing to mention the the rates given for this Association are position of the dots with regard to the slightly different from the figures quoted b> R .E .A . line. O f the hundred English farms the R .E .A . in its guide. The minimum no fewer than 87 would have paid more if charge is higher, at £1 for the first 40 kW h they had been billed on the R .E .A . tariff per month, but the final block rate is lower, and only thirteen would have paid slightly at id . As is well-known, a Co-operative less. A typical farmer, whose monthly bill Association borrows money from the R.E.A. is detailed in the M inistry’s report, is asked in order to pay for the lines which give the to pay 2-2d. per kWh in America, but the supply in its area, and the 2,541 members average price for the fifty farmers in Wessex of this Association had to find £103 per is l-56d. and for the fifty in Shropshire member. l-48d. To meet the total expenditure, the average As the report points out, steam sterilizing price per k W h to the members is not less is not used to the same extent in America than 2-75d. Despite the low final rate of as in England and therefore the English id . the average consumption for this farmers’ consumption of electricity is higher. Co-operative Association is only 1,824 kWh Instead of the typical American farm figure per annum. The conclusion must therefore of 3,500 k W h per annum, the average for be drawn that not only are British farmers the hundred farms considered was 5,000 kW h making much more use of electricity than per annum. Since the American farmer their American cousins, but also that they are would pay lid. per kWh for the additional obtaining supplies more cheaply. Commissioners’ Tariff Committee W T was reported some time ago that the Elec- Supply Association (who has been elected -*• tricity Commissioners intended to set up a chairman) ; Mr. Leslie Gordon, representing the committee to examine methods of charging for Conference of Joint Electricity Authorities and electricity. They have now announced the Joint Boards; Mr. F. Newey, representing the appointment of this committee which is “ to British Electrical Development Association ; and review in the light of present circumstances the Miss Caroline Haslett, representing the Electrical various methods of Association for Women. The secretary is charge and tariffs offered Mr. H. S. Lanphier. by authorized electricity undertakers in connec tion with the supply of Analysis of Cast-iron electricity for purposes ''HE method employed in the Staveley/Bradley- other than bulk supplies T 1Foster Research Department at Darlaston to other undertakers and for the rapid routine spectrographic analysis of to make recommenda cast-iron is described by D r s . J. E . H u r s t and tions as to forms of R . V . R il e y in a paper submitted to the Iron tariffs or methods of and Steel Institute. charge which would be The authors stress the importance, for the best adapted to promote attainment of accuracy, of suitable laboratory uniformity and develop lay-out, selection of representative analytical Sir John Dalton is m en t.” samples and rigid standardization of procedure. chairman _ of the The members of the Com m issioners* s!nsle and multi-spot methods of sparking committee are as Tariff Com m ittee tiuumination) are compared while considerations follows: Messrs. J. S. ng •choice of excitation and the Pickles and R. A. S. Thwaites, representing the u t\ce .? ^lr blast at the analysis gap on Incorporated Municipal Electrical Association, The etectrica? 011 °f r6SultS are deal‘ with. Mr. L. Howies and Lt.-Col. E. H. E. Woodward, Ihe electrical consumption of the comrilete representing the Incorporated Association of spectrographic outfit is small, the spark Electric Power Companies; Messrs. H. Bentham generator itself being rated at 0-25 kVA. The and W. Fennell, representing the Provincial laboratory was, however, purposely wired with Electric Supply Association; Col. Sir John Dalton, representing the London Electricity Z S S g ? for"" ‘"‘rpo“ °f A u g u st 9, 1946 E l e c t r i c a l R e v ie w 217 CORRESPONDENCE Letters should bear the writers' names and addresses, not necessarily for publication. Responsibility cannot be accepted for correspondents' opinions. Unsafe Installations means easy, the Technical Committee set to work and I have seen unofficially a prototype D. H. B R A ID expounds the views of JIR as a result of its work which to my mind is a number of supply engineers, but excellent. while such views are logical they appear to Some engineers have the impression that be unworkable. The sooner the useless all the present variety of plugs in use should arguments as to who is responsible for be swept away and consumers put to the unsafe installations stop, the better it will be expense of renewing throughout their pre for the whole industry. Surely Mr. Braid mises. This is not so. Some of us would does not imply that if all people engaged on like to see legislation which would make it installation work were members of the compulsory for all new installations to be E.C.A. or voluntarily registered all would be well. in line with the accepted standard, but all existing installations should be allowed to Having, unfortunately, been in the installa serve throughout their useful life. W ith the tion side of electrical engineering for very knowledge that we have now an agreed many years, I am satisfied that if all existing standard, surely it is high time to sink our installations had to comply with the I.E.E . differences and to accept the new standard Rules, there would be sufficient work for and let the consumers at large know that a skilled electricians for the next fifteen years standard is coming, although I will agree in putting them right. with some of your correspondents that it is There is only one solution for the elimina taking rather a long time. tion of unsafe installations but having “ Plain Engineer ” will have noticed in his mentioned this so often in these columns, I forty years’ career in the industry that 57 will leave it at that. or more varieties have grown up. Surely Glasgow. Alex. Milne, Senr. he can wait a few more months and see an agreed standard for all purposes. “ A Universal Plug—Now” H a lifa x . A. G. C o n n e ll, W RO M “ Plain Engineer’s ” remarks in Engineer and Manager. your issue of July 12th and the subse quent letters it would appear that there is Domestic Water Heating still some confusion with regard to the plug rM^HE article in your issue of July 26th and socket situation and I think it is as well dealing with this subject is not com to consider what are the facts of the case ; pletely accurate. It states that the circulator they are these :— must extend to the bottom of the cylinder, For several years the Electrical Industry and goes on to say that “ the large majority Committee of the B.S.I. considered the of complaints of insufficient bulk heating of desirability of one universal standard. D ur circulators arises from neglect on this point.” ing the period concerned it listened to Your correspondent is in error: the trouble opinions and views and finally came to the is not due to lack of length of the circulator decision that one universal plug and socket but to lack of length of the thermostat outlet for all domestic purposes was desirable provided with it. The longest thermostat and essential. A Technical Committee of supplied (but rarely) with a standard equip the B .S.I. was then appointed, whose scope ment is 18 in. and the normal length is 12 in., and terms of reference were approximately so that irrespective of the length of the in line with the Appendix to Post W ar Build circulator, the maximum depth of really hot ings Studies No. 11 and it was expected to water is either 18 in. or 12 in. produce the best possible type of unit, The only solution is to provide a longer whether the pins were flat, round or any thermostat or, alternatively, a circulator other shape. without a thermostat and a separately- Now, having obtained general agreement mounted thermostat fixed in the tank near from the var'ous sections of the industry, the bottom of the circulator unit. a n d it will be realised that this was by no Manchester. W . H a r t le y . ct 218 E l e c t r i c a l R e v ie w A u g u st 9, 1946 PARLIAMENTARY NEWS By Our Special Reporter Reinforced Concrete Poles objection had been lodged against the Order, either with the Commissioners or the Minister. N the House of Commons, on July 30th The Order was approved and it has also Mr. Vane asked the Minister of Fuel and I received the approval of the House of Lords... :- Power if he would clarify the Government’s policy on the use of reinforced concrete poles Water-Heater Prices for the supply of electricity in rural areas. On August 1st Mr. Driberg asked the Minister Mr. Shinwell said that to supply rural areas of Supply if he was aware that, since the with with electricity at the earliest possible date the drawal of purchase tax on electric geysers, their Government was encouraging the use of concrete price had been raised so that they cost the same poles wherever practicable. A technical com to the public as when purchase tax was levied: mittee was studying the possibility of reducing and if he would take steps to stop this exploita the cost of concrete poles which was higher than tion of the public. the cost of wooden poles. Mr. A. Woodburn said he was aware that in Wooden-Pole Shortage certain cases the prices of electric geysers had been increased since the withdrawal of the Colonel Gomme-Duncan asked the President purchase tax. Steps had been taken with a of the Board of Trade whether he was aware view to carrying out a cost investigation in that the shortage of wooden poles was still order to ensure that electric water heaters were delaying the building of light rural electricity sold to the public at a fair and reasonable lines in Scotland; and what steps were being price. taken to secure the necessary material from ab ro ad . Deaths from Faulty Wiring Mr. Marquand, who replied, said that there Mr. Skeffington-Lodge asked the Minister of was a general shortage of wooden poles for Works whether he was aware that some fifty electricity and other purposes. All practicable persons per year were killed as a result of the steps were being taken to obtain as many as inefficient electrical wiring of domestic premises; possible both from our own resources and from and whether he would consider the introduction countries overseas. of such wiring regulations as would prevent this C.E.B.’s Borrowing Powers loss of life. Mr. Wilson said he was not aware of the On July 31st Mr. Gaitskell, the Parliamentary number of fatal accidents resulting from Secretary to the Ministry of Fuel and Power, inefficient electrical wiring but he believed these moved the approval of the Central Electricity Board (Increase of Borrowing Powers) Special accidents were generally due to the use of Order, 1946, dated July 9th, 1946, made by the portable instruments or interference with an installation rather than to the installation itself. Electricity Commissioners and confirmed by the Ministry of Fuel and Power under the It was the general practice for electricity under Electricity (Supply) Act, 1919. He explained takings to supply current only when installations that the Electricity Supply Act, 1926, empowered complied with the rules of the Institution of the Central Electricity Board to borrow up to Electrical Engineers. It would not be practic a maximum of £33,500,000. But the Act also able to enforce regulations prohibiting the provided that the maximum could be increased improper use of installations. by Special Orders made by the Electricity S. G. Brown, Ltd. Commissioners, confirmed by the Minister of Fuel and Power, originally the Minister of In a written reply to a question the Financial Transport, and with Parliamentary approval. Secretary to the Admiralty (Mr. S. Dugdale) In fact, Special Orders of this kind were made says that it has been decided that the business in 1930, 1933 and 1941, bringing the total of S. G. Brown, Ltd. (which was taken over by amount which the Board could borrow up to the Admiralty in 1942) shall remain in public £70,000,000. The Order he was now asking ow n ersh ip . the House to approve raised the figure to £ 100,000,000. It was necessary because the Electricity Commissioners had already Belgian Congo Scheme sanctioned the borrowing of sums amounting N order to meet increasing demands fo to £69,875,000. I power supply, the Société Générale des Force The increased borrowing was needed for Hydro-Electriques du Katanga, -Sogefor’ has recently decided to establish a new hydro certain extensions of the grid system which electric power station of approximately 40,00 would become necessary, and also included the H.P. on the River Lufira to utilize the Kor acquisition of the war grid reinforcement lines Falls, about six miles below the plant at th and some extension of generating stations. No Cornet Falls on the same river at Madingusha August 9, 1946 E l e c t r i c a l R e v ie w 219 I’l ltSOW L and SOCIAL News of Men and Women of the Industry WT is announced that Mr. H. C. Spence, winning times. Two outstanding events were A.M.I.E.E., deputy borough electrical the Essex county championships for the ladies' engineer and manager at Croydon, has been high jump and 100 yards. Miss D. M. Endruweit appointed borough electrical engineer and of Ekco Athletic Club, with a jump of 5 ft 1 in., manager at Wimbledon in succession to Mr. N. took first place, with Miss D. G. Manley, of R. Elliott, who, as we have already reported, is Essex Ladies’ A.C., second. Miss J. C. E. taking up the appointment of general manager Shepherd won the 100 yards in 11-3 seconds. and chief engineer of the London and Home The prizes, including many cups, were Counties J.E.A. presented by Mrs. E. K. Cole. The Croydon Electricity Department is Mr. M. S. Thaker, B.Sc., M.I.E.E., of the advertising for a successor to Mr. Spence at a Calcutta Electric Supply Corporation, Ltd., is salary of £1,350 plus bonus (at present £60) and in London until the middle of October, when a special temporary payment of £400 per he returns to India. annum . Letters should be Prof. G. W. O. Howe is retiring from the addressed to him c/o James Watt Chair of Electrical Engineering at Grindlay & Co., Ltd., Glasgow University at the end of the present 54, Parliament Street, session and arrangements are being made to S.W .l. make a presentation to him to mark the occasion. Alderman Harry There must be many old students and other Leason, J.P., chairman friends of Prof. Howe who would like to par of the N.W. Midlands ticipate in the presentation, and contributions J.E.A., has been should be sent to Dr. A. J. Small, Electrical selected for the Lord Engineering Department, the University, Mayoralty of Stoke- Glasgow, 2. on-Trent for next year. Mr. C. Culmer Hodges, M.I.E.E., His brother, Mr. W. T. A.M .I.M ech.E., who has occupied the position Mr. M. S. Thaker Leason, has been Lord of chief engineer and manager to the St. Austell Mayor of the city and & District Electric Lighting & Power Co. since his father was Mayor of the old borough of 1930, is retiring on pension at the end of this Stoke-upon-Trent. year for reasons of health. Commencing as an Mr. J. A. Wykes has relinquished his post as articled pupil with the Bournemouth & Poole secretary of Hoover, Ltd., and has been Electricity Supply Co. in 1904, he was later appointed deputy managing director. He has with the Dover Corporation and the Dawlish been a director of the company since 1928. Co. before going to St. Austell. Mr. Hodges is Mr. F. H. Bunn, general sales manager, has been a past chairman of the Western Centre and also appointed a director and Mr. H. G. Meads, the of the Devon & Cornwall Sub-Centre of the assistant secretary, has been appointed secretary. Institution of Electrical Engineers. Mr. K. R. Plowright, A.M.I. Mech. E., has Mr. F. Bull, who has been acting manager of resigned from Hope's Heating & Lighting, Ltd., the Nottingham Branch of W. T. Henley s and joined Musgrave & Co., Ltd., Belfast, as Telegraph Works Co., Ltd., has been appointed manager in charge of air conditioning and manager cf that branch. Mr. W. L. Willey, ventilation. Messrs. J. W. Shepard and H. D. acting manager of Henley’s Hull Branch has Mains, who were formerly with Davidson & Co., also been confirmed in his position. Mr. S. L Crafford has been appointed Henley’s local Ltd., have been appointed to the board of representative at Colchester and will be in Musgrave & Co. charge of the Colchester Branch under the New appointments have been announced control of Mr. J. A. Newton, Norwich Branch by Brookhirst Switchgear, Ltd., following the m an ager. return of members from war service. Mr. H. Sir William Griffiths, chairman and managing R. Renfree, who has returned to the company, director of the M o n d Nickel Co Ltd., has been has been appointed assistant to Mr. F. A. nominated as a representative of that organiza Leonard, district manager of the Manchester tion to the C o u n c il of the Copper Development office; Mr. A. S. Verity, back from Europe, joins the Leeds office as assistant to Mr. K. N. Association. cnite 0f unsettled weather the annual sports Swash, district manager; and Mr. E. L. Wilson, who during the war was Control Gear Advisor meeting of E. K. Cole, Ltd., held on July 27th « very well attended. Numerous entries in to the Directorate of Industrial Electrical The open events from many athletic clubs made Equipment, has been appointed deputy to Mr. H. W. M. Parker at the London office. competition keen and resulted in some fine 220 E l e c t r i c a l R e v ie w August 9, 1946 Mr. C. A. Phillips has been transferred from the to succeed Mr. R. K. Jenkins who was recently Chester works to the Birmingham office as appointed borough electrical engineer of assistant to Mr. J. G. Frater, district manager. Workington. Mr. W. E. Knox has been elected president Mr. H. S. Smith, assistant secretary, Southern and general manager of the Westinghouse Area, has been appointed assistant general Electric International Co. He succeeds Mr. J. W. secretary of the Electrical Power Engineers’ White, who has resigned to become director Association. general of Industria Electrica de Mexico. Mr. F. Hampton has resigned from the lamp Mr. Knox has been vice-president of the sales department of Philips Lamps, Ltd., which International Company since March, 1944, and he had represented in Sussex and southern before that was assistant general manager. Surrey, in order to take up the position of Mr. W. J. Vine, F.I.E.S., has joined the managing director of Heene Electrical Products, Illuminating Engineering Department of Thorn Ltd., Worthing. Electrical Industries, Ltd., as a lighting engineer. Mr. J. Bailey, electrical engineer to the Mr. Vine has held a similar appointment with Barnoldswick, Lancs, U.D.C., has resigned to Holophane, Ltd., since 1937, dealing with take up a position with a private concern at street, flood, industrial, and commercial light Foulridge. The staff of the Electricity Depart ing, and he served from 1944 to 1945 in the ment presented him with a barometer. Royal Navy Electrical Branch. Mr. H. Peace, deputy electrical engineer and Mr. E. H. McConneil, the manager in Northern manager at Scunthorpe, has been appointed Ireland for George Cohen, Sons & Co., Ltd., has electrical engineer and manager in succession to been awarded the M.B.E. He played an Mr. A. L. Boyle, who is retiring in October. important part in organizing the export from On his retirement from the position of Northern Ireland of scrap for use in the war borough electrical engineer of Southend, Mr. A. effort, and also organized the Red Cross C. Johnson was the guest of honour at a dinner salvage scheme in conjunction with the Ministry when he was presented with a radio set by Mr. of Commerce for Northern Ireland. J. Linton, deputy electrical engineer, on behalf Edinburgh Corporation has approved the of the staff. appointment of Mr. W. M. Little as deputy transport manager. Mr. R. J. Hall has been elected to the board of British Insulated Callender’s Cables, Ltd. Mr. A. R. Shapley, deputy electrical engineer at Bath Corporation electricity works, has been Mr. G. N. Smibert has been appointed an appointed consulting engineer for three years. additional director of Richardsons, Westgarth He has been with the Department for 47 years. & Co., Ltd. Sheffield Corporation Electricity Committee Mr. C. A. Cross, A.M.I.E.E., of Oldham recommends the appointment of Mr. A. Hadcock, Corporation Electricity Department, has been distribution engineer, as distribution and sales appointed mains superintendent with Nuneaton manager at a salary of £1,050 per annum ; Corporation Electricity Department. - Mr. W. E. B. Nettleton, deputy distribution Warrington Corporation Electricity Com engineer, as chief distribution engineer at mittee has appointed Mr. F. J. Brown, technical £794 per annum; Mr. H. Price, station super assistant, as mains superintendent. intendent, Neepsend, as station superintendent, Blackburn Meadows, at £895 per annum; and Obituary Mr. D. McFarland, contracts engineer, as station superintendent, Neepsend, at £785 Mr. H. V. Carlisle.— The death occurred p er an n u m . recently while on a business visit to London of Mr. J. Bell, A.M.I.E.E., of Warrington, has Mr. Harold Vincent Carlisle, managing director been appointed assistant mains engineer with of the Carlisle Electrical Manufacturing Co. the Stockton-on-Tees Corporation Electricity The employees of the Chester Corporation Department, to fill the vacancy caused by the Electricity Department have been given per resignation of Mr. R. W. McOwen, A.M .I.E.E. mission to place a plaque on the wall of the Mr. W. Sinclair has been promoted from hydro-electric works in memory of Mr. S. E. shift charge engineer at Portishead power Britton, city electrical engineer for forty-two station of Bristol Corporation Electricity years, who died in June. Department to be assistant station super intendent at the Feeder Road generating station. Mr. C. Cripps, formerly shift charge A.S.E.E. Meeting engineer, has been appointed efficiency engineer 1WIHE next meeting of the West London Branch at Portishead generating station. Mr. D. H. of the Association of Supervising Electrical Keeling, shift charge engineer, Portishead, has Engineers will be held on August 15th retired after twenty-six years’ service. (7.30 p.m.) at the Oddfellows’ Hall, Hammer smith, S.W., when Mr. L. S. Meeks will speak Mr. W. E. Redmayne, of Finchley, has been on “ Electrical Pyrometry ” and “ Resistance appointed borough electrical engineer of Redcar Thermometry.” A u g u st 9, 1946 E l e c t r i c a l R e v ie w 221 Induction-Motor Starters Characteristics of Types in General Use IN C E the type of starting By “ Rotor ” such as the double-cage design. gear used with an a.c. motor A second disadvantage of the considerably influences starting conditions, direct-on-line starter is that, in order that it the requirements of the drive must be con may carry the starting current without tripping, sidered in each case before deciding which the overload releases may need a high setting, pattern to employ. The main requirements thus reducing the protection when running. are:— To start the motor as often as necessary This defect can be overcome in most cases by without dangerous overheating; to limit start using a slightly more complicated type of ing current to the value required by the user or starter in which the overload trips are cut supply authority; to carry full-load current out at starting, during which period the for the required periods without overheating; motor is protected by fuses or circuit breaker to be simple in construction and operation; of higher rating on the supply side of the to interrupt fault current automatically starter. without damage to itself; and, in certain Another point is that the mechanical cases, to vary the motor speed. power transmission medium coupled to the The initial starting torque of a squirrel- motor has to deal with the peak torque of cagS motor is practically proportional to the motor during acceleration. A squirrel- the square of the applied voltage and, in cage motor with direct-on-line starter may order to accelerate the motor against the develop in the region of three times its load resistance, sufficient voltage must be normal full-load torque at about 83 per applied to the stator windings in the starting cent of synchronous speed, this maximum position. The torque when switched direct on to the line V a r ia t io n o f S t a r t in g C o n d it io n s o f T h r e e - p h a s e S q u ir r e l - c a g e I n d u c t io n M o t o r f o r D if f e r e n t T y p e s o f S t a r t e r s may be 100 to 150 per cent of full-load value, increasing as the Direct Line Auto- Star- Starting Method on Re Trans Delta rriotor accelerates to about 83 Line sistance form er per cent of synchronous speed, Per cent of mains voltage applied then falling with further rise of to motor at starting 100 33 33 58 speed. The rate of acceleration Motor starting current, per cent will depend on the amount by of direct-on-line starting which the motor torque exceeds current 100 33 33 58 the load torque during this Motor starting current, per cent period and also on the inertia of full-load current 600 200 200 346 of the rotor and coupled load. Line-starting current, per cent of These factors determine the full-load current 600 200 67 200 length of the starting period. Starting torque, per cent of The direct-on-line starter is direct-on-line starting torque 100 11 11 33 the simplest to install, use and Starting torque, per cent of full- maintain and makes available load torque 150 17 17 50 during acceleration the maxi mum starting torque of the motor. It has torque usually being somewhat less in a the disadvantage that the initial current from double-cage motor. The safety factor of the mains is very high, usually about six the transmission medium is often sufficient times the full-load value, so that in order to deal with a brief overload of this nature, to prevent a momentary fall of mains voltage but trouble is sometimes experienced when and interference with connected lighting, driving a heavy load or load of high inertia the supply authority stipulates a maximum such as a large fan, which requires consider horse-power for motors started in this way. able power to accelerate to full speed. A The limitation on the H .P. of the motor, driving belt may slip off its pulley during not on peak starting current, is a disadvan prolonged peak torque. Possible remedies tage, as in some cases starting current are to use a larger belt or a motor having a could be reduced without loss of starting lower peak torque or a type of starter which torque by using a particular type of motor, reduces the starting torque. A u g u st I l l E l e c t r i c a l R e v ie w 9, 1946 To reduce the starting current of a given applied voltage, the stator current havi squirrel-cage motor, a type of starter can be similar proportion. used which lowers the initial voltage applied After acceleration has ceased the mo or to the stator windings. Such starters are, in speed will depend entirely on the load, the general, rather less simple than the plain slip being such that the motor automatically direct-on-line starter and reduce the starting takes just sufficient current to produce a torque, which may often be undesirable. torque equal to the load torque at that speed. The torque of an induction motor is pro It is important to realize that if the motor is portional to the peak magnetic stator flux operated with reduced flux when running at produced per cycle, the rotor current and reduced voltage, increased rotor and stator the rotor power factor. Since the induced currents will be required to create a given stator voltage is proportional to the strength torque, so that overheating may occur with of magnetic flux linked with the windings, full-load torque. a reduction of applied voltage automatically W hen a stator-resistance starter is used to V reduces the stator flux, the stator magnetizing reduce the voltage from V to the starting current falling in almost the same proportion, T provided the magnetic circuit is not highly torque will be reduced from T to ^ - 2, but the saturated. The voltage induced in the rotor starting current will be reduced only from I to }, approximately j^ee A table). This method is uneconomical, as power is wasted in heating the starting resistance, but it is suitable for certain small motor drives where smooth starting is required, as any number of steps of starting current and torque can be pro vided. A star-delta starter can be used with motors having stator windings delta - con nected for running; both ends of each winding are brought out to terminals and six cables are required to connect the motor to its starter. Fig. 1 shows the connections of a typical drum type hand - operated star- delta starter having overload trips (O) and no-volt trip (N ) and conductors is proportional to the rate of fixed (F ) and moving (M ) contacts. The cutting by the stator flux; at a given speed no-volt coil is not energized until the the rotor voltage and rotor current are thus starter handle reaches the running position. proportional to the stator flux. It follows The stator windings are connected in star that the motor torque at each speed is in the first position, each phase then receiving practically proportional to the square of the 58 per cent of full-line voltage to give starting A u g u st 9, 1946 E l e c t r i c a l R e v ie w 223 torque and current values one-third of those also a motor which normally starts up obtained with direct-on-line switching. unloaded may trip on load and have to be The effect of star-delta starting applied to restarted under bad conditions. The motor a motor coupled to a centrifugal pump, the may then have to be assisted to start by load torque of which increases with the pulling the belts or by moving the starter speed, is shown in Fig. 2. The motor will to the full-on position whilst at a standstill or turning at low speed. When a motor is required to run for a considerable period on low loads a star-delta starter can be used to run it in star, reducing the magnetizing current and iron losses and increasing power factor and efficiency (Fig. 3). When using a starter in this way protection against overload must be provided by setting the trips at about 60 per cent of normal. Auto-transformer Starters Auto-transformer starters can be used with motors having either star- or delta- connected stators and both ends of each 80 100 phase of the stator windings need not be PER CENT OF SYNCHRONOUS SPEED available. W hile somewhat similar to the star-delta starter in the arrangement of the Fig. 2.—Star-delta starting of motor coupled contacts and in operation it is more expensive to centrifugal pump since it incorporates an auto-transformer to give reduced voltage at starting (Fig. 4). accelerate to about 90 per cent of synchronous Most starters of this type, however, are speed with the switch in the starting position, more flexible than star-delta starters as the at which speed the line current reaches about auto-transformer often has three sets of 80 per cent of full-load current. As soon tappings, which may give 50, 60 or 75 per as this steady speed has been reached the cent of line voltage to give starting torques starter should be thrown swiftly to the delta of 25, 36, or 56 per cent of the direct-on-line position, in which the stator windings receive values, which are adequate for most drives full mains voltage. The line current then without causing excessive starting currents. increases to approximately 240 per cent When the load needs a high proportion of and the torque to 220 per cent of full-load full-load torque at all speeds, the ordinary values. The increased torque causes rapid squirrel-cage motor may not develop sufficient acceleration to full speed, in this case 97 per cent of synchronous speed. B y this means current and maximum applied torque are reduced and the period of high torque is limited. If the starting handle is moved to the delta position before the ^ motor has accelerated to a steady speed in star, the torque and current will be increased. Limited Starting Torque W ith this type of starter the starting torque is limited, but it is suitable for drives where the motor starts against up to 3C to 40 per cent of full-load torque. A slightly higher starting torque may be obtained by using a double-cage motor, which may develop about 75 per cent of full-load torque in star. The possibility of occasional alteration of starting Fig. 3.—Power factor of three-phase m otor in star conditions should be borne in mind The and in delta starting load may be increased after prolonged stoppage owing to stiff belts or to the oil torque to start the load direct without having d ra in s from the bearing surfaces; employing a type of starter which would A u g u st 224 E l e c t r i c a l R e v ie w 9, 1946 take an excessive starting current. In some length of the high-current period during cases the load can be applied after the motor starting. The friction shoes can be spring- has been started by a reduced-voltage starter. loaded, preventing their operation until the Fig. 2 shows that once the full voltage has motor has reached a pre-determined speed. been applied and the motor is running at A clutch of the latter type with a two-position speed, the maximum torque is available for starter must be arranged to operate at the accelerating a load, without taking a very correct speed. A t too low a speed the load high line current. If the motor is started may be applied before the motor torque has unloaded and then coupled to the load the reached a high enough value to accelerate speed will fall slightly and the motor torque will increase to a high value to ensure acceleration to normal speed once more. This method of starting may entail the use of fast-and-loose pulleys or some form of clutch. Centrifugal Clutch A centrifugal clutch on the motor shaft may act as a belt pulley if required. A t low motor speeds the portion of the clutch coupled to the motor is free to revolve inside the portion coupled to the load, so the motor can start up light. Friction shoes carried by the motor portion of the clutch are thrown out by centrifugal force as the motor speed the load, and the motor and clutch may tend STARTER to “ hunt ” or the clutch may slip when the motor speed rises and peak torque is de veloped. If the clutch operates at too high a speed it may tend to slip on heavy loads when the speed falls slightly. High current peaks may result from the clutch functioning too soon or too suddenly. Transient Currents Whilst the handle of a star-delta or auto transformer starter is being moved from the starting to the running position, the motor is disconnected from the supply and continues to run under its own momentum and that of any coupled load, acting as a generator with a falling voltage. The motor voltage may then be out of phase with the mains voltage when reconnected to the supply in the running position of the starter, and this may result in a momentary rush of high current through the windings. Such transient surges are avoided in a modified type of star-delta starter which has three starting positions. This starter is slightly more complex than the standard pattern as it incorporates resistance units; but it has the advantages that the maximum F ig. 4.—Connections of auto-transformer starter with overload and no-volt trips line current is only 50 per cent of that usually obtained with a star-delta starter and the increases, and exert an increasing force on transient currents are practically eliminated, the load poition so the load is taken up as the motor remains connected to the supply gradually. Fig. 5 shows the reduction in the during the whole starting period. i n a August 9, 1946 E l e c t r i c a l R e v ie w 225 modified type of auto-transformer starter the number of starts in rapid succession the windings of the auto-transformer act as cooling period may be inadequate. The choke coils during the transition period to purchaser should, therefore, advise the limit the current. suppliers of the control gear of the starting Where the speed of a large motor has to frequency, especially if this exceeds about be controlled independently of the load, a five per hour. slip-ring motor is generally used with a rotor When a rotor starter controls the running resistance starter to regulate the rotor current speed of the motor it should be designed and power factor in order to govern the mechanically so that the handle can be left stator current and motor torque and to in intermediate positions and thermally so enable any torque up to full-load to be that the resistance units are large enough to developed at any speed within the range of carry the current continuously without over the motor and starter. Greater flexibility is heating. As the waste of power caused by thus obtained, but the motor and control heat generated in the starter has to be gear in this case are more expensive and less supplied by the mains, this method of speed simple. control is principally used when short runs Heat is generated in the rotor starter at a at reduced speed are required. A liquid rate which is proportional to resistance x rotor starter can give an infinitely variable current2, and a type of starter should be used speed up to full speed, but fairly rapid which gives sufficient torque to accelerate the evaporation of the liquid may occur at motor to full speed in a reasonable time in reduced speeds. A liquid starter should order to reduce the heating period. The have metal-to-metal contacts which are generated heat is normally dissipated when closed in the full-on position, to reduce the motor is running on load, so that for a losses and evaporation. An X.ll.l). Cooker r j’O meet the urgent needs of the Ministry embossed runners. Thermostatically controlled * of Supply in connection with the National plug-in type elements (2 kW) are located Housing Drive, Parnall (Yate), Ltd., Yate, behind these pressed walls, louvres in the loose near Bristol, is now producing an electric box interior favouring good circulation and cooker employing light alloy die-castings even heat distribution. An aperture low down extensively instead of the usual cast-iron and in the back of the oven takes care of ventilation sheet steel. Both from the installation and the and steam is ultimately discharged through cleaning aspect aluminium has advantages. grilles in the low Instead of having the customary vitreous hollow splash-plate enamel finish, with its proneness to chipping and which surmounts to abrasion, the hob (for which patents have th e hob. been applied) presents a surface of lightly In general ap fluted design on the bare metal, any wear falling pearance modern wholly on the tops of the ribs and cleaning cabinet lines have becoming a simple matter. Moreover the been followed and hob plate may be lifted bodily out of its sur the whole body of rounding frame without screws or other attach the cooker sur ments for washing in the sink, if desired. The mounts a plinth of general exterior finish of the cooker is of grey sheet steel which mottled synthetic enamel which is claimed to includes the stan be more resistant to damage than vitreous dard toe recess. enamel because of the greater yielding power of Overall dimensions the aluminium base. excluding 4 - in. The under-hob construction facilitates plate splash-plate are 21 adjustment and cleaning. The back stretcher in. wide by 19^ in. bar carries the standard live and earth plug by 36 in. high, sockets for grill-boiler and boiling plate con while the hot cup nections, together w ith a fuse unit in a central board is 17 in. position and th e main terminals and hob Parnall N.H.D. cooker wide, 14-^- in. deep sw itch es below, the whole forming an extremely an d 6 i in. high. sim ple wiring layout. The switches are coupled The 10i-in. by 8-in. grill boiler and the 8-in. to the white bakelite knobs on the cooker front boiling plate have loadings of 2 kW and 1,800 W b y rem ote c o n tr o l rod s. respectively. Simmering control is provided as The removable sheet-alumimum oven has an extra. A u g u st 9, 1946 226 E l e c t r i c a l R e v ie w South African Ira # General Decline in Imports in 1944 were the United Kingdom and the United States. WkETAILS of the external trade of the During the war a remarkable increase took Union of South Africa during 1944 have place in the export of South African cable and recently been published in Pretoria. The wire It totalled in value £750,600 in 1944 and values of the imports of electrical goods in that went mainly to India. Electrical machinery year are shown in the accompanying table was exported in that year to the value of £68,500, together with a note of increase or decrease with Egypt and Southern Rhodesia leading compared with 1939. It will be seen that the customers; and other material valued at trade declined steeply and increases were £55,000 with India a good customer. negligible. The chief of the supplying countries 1944 Inc. or 1944 Inc. or Class £ dec. or Class £ dec. on (000) 1939 (000) 1939 3 - 82 7 42 Vacuum cleaners— B a tteries , prim ary — From United States 3 - 3 From United Kingdom 1 20 9 - 16 6 19 Elec. hand lamps— „ United States From United States 8 - 3 106 110 20 Batteries, secondary — Elec. lamp bulbs— 209 - From United Kingdom 55 6 165 + 9 2 From United Kingdom . . „ C anada 5 „ United States 33 + 14 46 97 ,, United States Shades and reflectors— 4 - 36 P a rts fo r ba tteries— 28 From United Kingdom . . 3 - 13 From United Kingdom 15 Self-contained elec. lighting outfits 4 - 36 „ United States 12 From United Kingdom 2 - 10 „ Brazil 1 „ United States 2 - 24 8 * Dynamos and generators— 14 Elec. meters— 11 54 From United Kingdom . . 6 From United Kingdom 1 „ United States 3 13 „ Switzerland . . • • - Radio apparatus for ships, aircraft and M o to rs — 204 187 * 93 public radio services— 18 From United Kingdom 175 12 29 26 From United Kingdom „ United States „ United States 6 Transformers— 86 226 12 * 129 R a d io sets — 1 From United Kingdom 81 From United Kingdom . . „ United States 5 40 10 ,, United States * Other electrical machinery — 768 1,072 Radio valves— 18 From United Kingdom 579 827 From United Kingdom 6 ,, United States 188 38 „ United States 12 - 654 Cable and wire— 107 - 775 Radio apparatus and accessories — 24 From United Kingdom 65 684 From United Kingdom 5 - 75 „ C anada 1 1 „ United States 18 - 361 ,, United States 41 29 Instruments and appliances for radio — 13 - 7 Stoves and parts— 48 telegraphy and telephones 32 From United Kingdom 12 - 5 From Canada - 10 „ United States 8 In su lators, p o rcela in — 26 13 - 1 Other heating and cooking apparatus- 26 305 From United Kingdom 20 73 „ C anada 11 — From United Kingdom 1 - 5 ,, C anada 2 150 ,, U nited States * Comparative figures not available. L.C.C. Housing Schemes A R G E schemes for providing housing accom munity centres, etc., leaving about 329 acres L modation for Londoners were submitted available for housing development. to the L.C.C. for approval at its meeting With these proposals the Committee sub last week by the Housing and Public Health mitted a report as to seven new types of dwellings Committee. The most important provide for for future erection on the Council’s housing the purchase of sites at Borehamwood, East estates, designed to give effect to the Minister of Tilbury and at Oxhey. The three sites at Health's suggestion for increasing the area of Borehamwood total about 1,200 acres and three-bedroom houses and for providing three- accommodation could be provided for from bedroom and larger houses. All the proposed 25,000 to 30,000 persons. The site at East new types are planned with standard kitchen Tiibury has an area of 832 acres, and the fittings. Constant hot water will be provided ultimate population envisaged is 20,000 p erson s. from a heating unit in the living room, which It is proposed to reserve 120 acres for industry. will also afford background heating to the two The Committee submitted an estimate of larger bedrooms by means of ducts. An £5 690 750 for the development of the Council's electric immersion heater or gas heating element housing site of about 925 acres at Oxhey. will be provided for summer water-heating, and About 390 acres of woodland and open space electric fires or gas fires will be provided in the would be preserved, whilst provision is made for main bedrooms and there will be points for electric fires in other bedrooms. educational purposes, shops, churches, com 111 August 9, 1946 E l e c t r i c a l R e v ie w COMMERCE and INDUSTRY Municipalities and Nationalization. Large Overseas Contracts. vacuum cleaners and parts, torch and high- I.M.E.A. and Nationalization tension batteries and sparking plugs. Applica T the annual meeting of the Incorporated tions for import licences must be accompanied A Municipal Electrical Association at Black by a certificate from the Belgian Office Centrale pool it was announced that an extraordinary des Contingents et des Licences to be obtained meeting was to be called to devise steps to by the Belgian manufacturers or their agents. protect the interests of municipal electricity undertakings in the reorganization of the Control of Aluminium and Light Alloys industry. This meeting is to be held at Caxton Government wartime control of the purchase Hall, Westminster, S.W.l, next Thursday, of aluminium and light alloys is removed with August 15th, at 10 a.m. effect from August 1st under two Orders made by the Ministry of Supply, namely, the Control of Trade Mission to China Aluminium (No. 7) Order of 1946 and the The Government has announced its intention Light Metals and Alloys Fabrication (No. 2) of sending a trade mission to China, probably (Revocation) Order, 1946 (S.R. & O. 1946 about the middle of September, to study methods No. 1269 and No. 1270, Stationery Office, price of developing trade between China and the Id. each). As the Ministry has made a contract United Kingdom. The leader will be Sir for the supply of 215,000 metric tons of virgin Leslie Boyce, chairman of the Gloucester aluminium from Canada during the years 1946- Carriage & Wagon Co., Ltd., and the members 1947, it will continue to be the sole buyer and include Mr. D. Maxwell Buist, who was recently seller of virgin aluminium. given charge of the new B.E.A.M.A. Export The Ministry is also cancelling directions Section and will represent heavy electrical previously issued to the light alloy industry industry, and Mr. A. H. Carmichael, repre requiring the segregation of light alloy scrap into various categories, and the making ot senting light engineering. statistical returns. Arrangements have been made for statistics to be furnished on a volun Employment in May tary basis by the industry, and totals will be T h e J u ly Ministry of Labour Gazette sh ow s issued monthly by the Ministry of Supply. that there was a small general decline in the numbers employed in the electrical industries Royal Norfolk Show during May. A total of 152,000 is shown for the electrical engineering industry, including A feature of the Royal Norfolk Show held 48,400 women, as compared with 152,800 lor at Crown Point, Norwich, on June 20th was a April (50,100 women) and 133,900 formid-1939 (28,000 women). For electrical wiring and contracting the total for May was 46,400 (5,400 women), against 46,200 (5,400 women) in April and 41,700 (2,800 women) in mid-1939. For the electrical appar atus, cables, etc., group the total was 235,900 (116,800 women), against 236,100 (118,900 women) in April and 195,900 (79,500 women) at mid- 1939. Unemployment figures for the United Kingdom were as follows. Norwich Electricity Departm ent’s display at the Royal Norfolk Show Electrical engineering, and contracting, comprehensive display of farming equipment 2 981' electrical wiring and domestic electrical appliances, arranged by L036; electrical apparatus, cables, etc., 3,591 the Norwich Corporation Electricity Depart ment, under the supervision of Mr. J. A. Token Imports from Belgium Sumner, the city electrical engineer. The » have recently been made for electrical apparatus shown on the stand included electric tools, welding plant, farm sterilizing, „ Ar an® Snorts fr°m the United States and steam raising and milking plant, pumps and n Ba at the rate of 20 per cent annually by w of the pre-war imports of the manu- corn grinding equipment. The domestic value of the P Thg arrangement has apparatus included refrigerators, water heaters, facturers cone ^ Belgium andj as before, clocks, fires, etc., while other exhibits were nt7 Bet carbon electrodes, industrial porcelain two electric vehicles. Visitors to the Show took particular interest in insulators, cooking and heating appliances, 228 E l e c t r i c a l R e v ie w A u g u st 9, 1946 the electric clock tower, which is appropriately mining switchgear, including a complete range shown in the accompanying picture between the of fully flameproof and explosion-proof air- Thorpe power station and a transmission line insulated switchgear and a complete range of tower in the background. flit-plug cable-coupling boxes. The range of air-insulated panels defined as Large Portuguese Contract the type GA range, from GA1 to GA9, meets mining requirements for the distribution and A British group consisting of the English control of electrical energy at working-places Electric Export and Trading Co. and the with modern mechanical working. Particular Metropolitan-Vickers Electrical Export Co. attention was given at the exhibition to the has negotiated a contract, valued at one million ty p e G A 8 and type GA9 panels, which have been sterling, covering the equipment of a 200,000- developed for use in room and pillar workings H.P. hydro-electric power station, which is to be where head-room is restricted and mobility is constructed to the order of the recently formed essential. The flit-plug cable-boxes were hydro-electric company, the Hidro-Electrica do another interesting feature. They are available Zezere of Lisbon. The power from this station for joining cables together or for connecting will be used, via the national grid, to ensure cables to switchgear and transformers, and are ample electrical supplies to Central Portugal, more largely used than before, since the latest and will play a great part in the augmentation mining methods require more frequent move of Portugal’s industrial resources. The station ment of underground machinery. will be situated at Castelo do Bode, 100 km north west of Lisbon, on the Zezere River, a tributary of the Tagus. Scroll Light Bed Lamp E. Dawson (Lamp Factors), Ltd., 10, Grays Brazil Railway Electrification Inn Road, London, W .C. 1, are joint distributors An important contract for Brazil has just with Underwood (Electric), Ltd., of this lamp been placed by the San Paulo Railway with the which was described in our last issue. English Electric Export and Trading Co. It covers the electrification of the San Paulo House Wiring Contracts Railway from Jundiahy to Mooca, and includes The Alpha Manufacturing & Electrical the provision of electric locomotives, rolling Co., Ltd., has received the contract for the stock, substations and associated distribution internal wiring of 810 B.I.S.F. houses in Ayles eq u ip m en t. bury, Nuneaton, Cheltenham, Bournemouth Works Magazines and Wantage. In April last a conference on works magazines Works Visit was organized by the Industrial Welfare Society, The Yorkshire North-West Branch of the 14, Hobart Place, Westminster, S.W .l. The Association of Mining Electrical & Mechanical Society has now issued a 32-page report (2s.) Engineers is visiting the Hydra Steel Works on the conference reproducing the opening at Ecclesfield, Sheffield, of Hall & Pickles, Ltd., address by Mr. George Isaacs, Minister of on August 21st. Labour, the three papers and the discussion. Three appendices give sample costs, notes on Peruvian Electrical Imports current practice and a list of works magazines. According to the Board of Trade Journal, Australian Electrical Imports imports of electrical apparatus into Peru during 1945 were valued at 16,932,000 soles (about The Australian Bureau of Statistics has £650,000) as compared with 14,036,000 soles issued preliminary figures of the overseas trade (about £540,000) in the preceding year. of the Commonwealth for the nine months ended March last. Imports of electrical appliances and equipment were valued as follows ; the Fatal Shock from Cleaner comparative figures for 1944-45 are given :— “ One wonders if compulsory expert examina tion of these machines should be adopted to July-td arch prove their safety; otherwise, the housewife Class 1944-45 1945-46 £000 £000 is carrying out her duties in a state of peril,” commented the coroner, recording a verdict of Batteries and accumulators 121 64 “ Death by Misadventure ” at Clayton-le- Cable and wire, covered 557 360 Moors on July 16th, on Mrs. May Gregson (42), Dynamo-electric machines 668 815 who was killed while using an electric cleaner in Lamps, filament 85 136 her scullery. It was stated that a flex from the Telegraph and telephone instru motor was bare and in contact with a metal ments, etc. 861 862 Other electrical appliances 2,331 1,845 sleeve so that the whole machine was alive. International Flanders Fair Mining Equipment Exhibition The first International Fair of Flanders will A mining exhibition was organized by the be held at Ghent, Belgium, from September 6th Ministry of Fuel and Power (Recruitment to September 21st. Exhibits will embrace Branch) and held at Swallownest Miners’ practically the whole of Belgium’s industry Welfare Ground, near Sheffield, on August 3rd including mechanical equipment, electrical at the. fete and gala arranged by the National supplies, textiles, agricultural machinery Union of Mineworkers, Waleswood Branch. building and construction, instruments and Various manufacturers of mining equipment chemicals. Very complete arrangements have were represented, and A. Reyrolle & Co., Ltd., been made for publicity and it is hoped that of Hebburn-on-Tyne, exhibited some of their many buyers from other countries in Europe August 9, 1946 E l e c t r i c a l R e v ie w 229 w attend the Fair. British manufacturers who on formal consent to the construction of the are interested in exporting to the Continent power station, and the necessary borrowing can obtain full details from the United Kingdom powers, being received. agents, the Anglo Continental Market Develop ment Co., 57, Fetter Lane, London, E.C.4. Fluorescent Lighting on a Dairy Farm The dairy farm of Mr. C. D. Notley at Coal to Fuel Oil Conversion Firethorn Farm, Ewhurst, has recently been In a written answer to a Parliamentary modernized by the erection of new cowsheds question the Chancellor of the Exchequer for his T.T. and attested Jersey cows, and a stated on August 1st that after consultation dairy by S. L. Hill, Ltd. An interesting feature with the Minister of Fuel and Power he had is the lighting by “ Atlas ” fluorescent tubes, decided to propose in next year’s Finance Bill made by Thorn Electrical Industries, Ltd. In that the import duty of Id. per gallon should the cowsheds six 80-W fluorescent tubes have be removed from heavy fuel oil and gas oil. been installed, while in the dairy the installation In the meantime, from October 1st, until the date when the import duty is removed, a subsidy of £1 per ton would be paid to consumers in this country of such oils, whether imported or home- produced. It was hoped that these arrangements would result in conversions from coal to oil to the maximum extent possible. The Ministry of Fuel and Power states that steps are being taken to encourage conversion of plant tempor arily from coal burning to oil fuel burning where it is clear that this may be done with advantage to relieve the present and prospective pressure on coal supplies. Every assistance will be given to industrialists desiring to make the change and arrangements have been made for ordering in bulk the necessary equipment and oil-burning appliances so that the change, where applicable, may be made as speedily as possible. Regional Officers of the Ministry of Fuel and Power are now consulting industrial undertakings where plant Atlas” fluorescent lighting in the dairy of Firethorn conditions are suitable for conversions Farm, Ewhurst to oil and discussions in this connection are taking place with the gas and electricity includes two 80-W tubes in a new plastic fitting supply industries and the railway companies. which is unaffected by moisture and steam. The electric milk cooling equipment installed at the Cable for New Houses farm is by Frigidaire. Commenting on the position as regards the German Patents supply of underground lead-covered cable for new houses, Alderman J. Canon Bardsley told A conference to consider the question of the Warrington Town Council, at its July meeting, future treatment of German-owned patents in that sufficient cable had been received to cope Allied countries took place in London from with all applications made for individual July 15th to 27th. Delegates attended from connections and there was sufficient cable in Australia, Belgium, Canada, Czechoslovakia, hand to allow the Corporation to meet a certain Denmark, France, Luxembourg, Netherlands, number of demands. Alderman D. Phnston Norway, Union of South Africa, the United said he had it on good authority that there Kingdom and the United States of America. would not be any delay in the completion of The chairman of the conference was Sir Harold houses for the want of cable. Saunders, Comptroller of Patents in the United K in g d o m . At the conference the representatives of Leeds Power Station Contracts France, the Netherlands, the United Kingdom In connection with the projected new power and the United States of America signed an station to be built by Leeds Corporation at accord which will have the effect of making all Skelton Grange, a sub-committee has recom patents of former German ownership now mended that, subject to the C.E.B. agreeing controlled by their Governments, and in which that in the special circumstances it is undesir there is no non-German ownership now con able to invite tenders, the quotation of Inter trolled by their Governments, and in which national Combustion, Ltd., for supplying and there was no non-German interest existing on erecting boiler plant at a cost of £1,782,936 be August 1st, 1946, available within their respective acceffied It is further recommended that the territories to all nationals of the countries party tender of C. A. Parsons & Co., Ltd., for the to the accord without payment of royalties or suDtdv and erection of two turbo-alternator without any requirement to manufacture sets two condensing plants and auxiliaries, for within the country where the patents exist. £798 728 should be accepted, both conditional The representatives of Australia, Canada, If August % 1946 2 3 0 E l e c t r i c a l R e v ie w Czechoslovakia, and the Union of South Hours and Wages Africa agreed to recommend to their respective Governments that they should also sign the HlJb E Ministry of01 wLabour u»“* aIi¡n d n_ u , irv;,.3 tl°in n to tan ac co rd . T Service conducted another^.^ The accord remains open for signature by s and wages in in ^.y, nts out of other members of the United Nations and by last Ahnut 52 400 establishments out or neutral countries until January 1st, 1947. It last. About oz, returns suitable will come into force as soon as it has been for53,600 tabulation; fPProac^ these dseree^ empioycu toyed over five million signed by three further countries provided they people. The results are set out in the July sign before the end of 1946. M i n i s t r y of Labour Gazette. workers in Reports on German Industry The returns covered ‘22>234 woncers in the electrical engineering industry of whom Among further reports on German industry 68,350 were men (21 and over), *4.448 youths now available are the following:— C.I.O.S. an d b o y s 36,498 women (18 and over) and X X X 1-43, “ Tube-making Plants : Mannesmann Rohrenwerke " (2s. 6d.); B.I.O.S. 408, “ Con 2 938 girls Their average hours with earnings tact Rectifier for Heavy Currents: Siemens- (in p aren theses) in th e la st w e e k o f Janu ary were Schuckert, Berlin” (2s.); B.I.O.S. 528, as follows:— Men 47-4 (122s. 5d.); youths and “ Reports on Dams and Hydro-Electric Schemes b o y s 43-9 (39s. 4 d .) ; w o m en , exclu d in g part- in South-West Germ any” (8s.); B.I.O.S. 533, time workers, 41-8 (62s. Id.); girls 41-9 “ Electric Furnace Design, Manufacture and Application in Germ any” (9s. 6d.); B.I.O.S. (34s. 7d.); all workers 45-2 (92s. 6d.). 551, “ German Wireless Communication: In the electrical apparatus, cables, lamps, etc., Mainly with reference to Cm, Dm and Pulse group there were 48,502 men, 6,090 youths and Technique” (2s.); B.I.O.S. 564, “ Industrial boys, 48,976 women and 4,130 girls whose Electronic Measuring Equipment ” (2s.). ; hours and earnings were as follows:— Men F.I.A.T. 573, “ German Air-Conditioning and 48-9 (120s. Id .); youths and boys 43-5 (40s. 3d.); Refrigeration Industry ” (3s. 6d.) ; B.I.O.S. women 42-1 (63s. 2d.); girls 42-5 (35s. 1 Od.); 413, “ Primary Cells,” by Professor A. Schmid (6d.); B.I.O.S. 500, “ Ljungstrom all workers 45-4 (86s. 6d.). Turbines in Germany” (9s.); F.I.A.T. Returns from the electrical contracting 514, “ Report on High-Voltage Switchgear ” industry included 4.464 men, 2,384 youths and (3s. 6d.); and F.I.A.T. 801, Industrial boys, 68 women and 36 girls. Hours and Safety in Germany ” (13s. 6d.). A few copies earnings were as follow s:— Men 49-8 (125s. 9d.); are available from the Stationery Office at the youths and boys 47-2 (35s. 5d.); all workers prices shown and the reports may also be seen 48-8 (93s. 9d.). No particulars were available at the leading libraries. for women and girls. Change of Address Of 68,984 people dealt with in the case of the electricity supply industry 61,559 were The Mining Association of Great Britain men, 4,342 youths and boys, 2,899 women and has removed its offices to Bolton House, 61, 184 girls. Their hours and wages were:— Curzon Street, London, W.l (telephone: Grosvenor 4801-5). Men 49-4 (110s. 7d.); youths and boys 45-3 (35s. 7d.); women 41-8 (70s.); all workers Trade Announcement 48-8 (104s.). No particulars are given for girls. The General Cable Co., Ltd., has opened a new depot at 54a, Newton Street, Manchester, Average hourly earnings for adult male under the management of Mr. Douglas Baker. workers were as follow s:— Electrical engineer ing 31 d.; electrical apparatus, etc., 29-5d.; electrical contracting 30-3d.; and electricity supply 26.9d. TRADE MARKS PPLICATIONS have been made for the Export Inquiries A registration of the following trade marks. Objections may be entered within one \\ have received the undermentioned month from July 31st:— inquiries from firms and individuals W e ld co n . N o . 640,603, C la ss 7. W e ld in g o verseas w h o w ish to secu re ag e n cie s fo r British machines and parts thereof not included in other electrical equipment and appliances or to import classes.— Welding Controls, Ltd., la and 24, Into the>r territories. We shall be glad to High Street, Kempston, Beds. p ass on to th em rep lies re c e ive d fro m readers Westrex Standard. N o . 640,491, C la ss 9. Sound reproducing installations, instruments nnnL Sbould be addressed to the Editors, and apparatus.— Western Electric Export Cor- quoting the number given in parentheses We noration, New York. Address tor service: cannot vouch for the standing of i Z ^ s anc c/o F. C. Tomlins, 5, Mormngton Road, manufacturers replying to them will no doubi require the usual references :— WFi5o-M ^ icenNoSS641,159, Class 9. Electric India — Manufacturing firm require th » storage batteries and covers therefor. Firestone phase furnaces for the production kr u Tire & Rubber Co., Akron. Ohio. Address plates and brushes. It also wishes t 03 foi service: c/o Stevens, Langner, Parry & Rollinson, 5-9, Quality Court, Chancery Lane, carbon products, radio sets, refr° ImP°r accumulators and dry batteries, etc ?®erators W .C .2. (X .16 2 .) August 9, 1946 E l e c t r i c a l R e v ie w 231 1 VT| t Edinburgfli Extensions > ^ » m Intensive Development in Existing Station si : kflj R IE F reference was made in our last further investigation showed that a cross H issue to the new plant which is to be compound machine with similar cylinders installed in the Portobello station of theside by side could easily be accommodated. ' K The proposed new machine will therefore Edinburgh Corporation Electricity Depart ment. Mr. J. F. Field, the engineer and be about 45 ft long overall and will be M,. placed athwart the turbine room similar ind manager of the Department, has now sent us some further information on the to the machine it displaces, and since the 60-M W unit comes comfortably ‘OtJuEr subject. within two gantry column centres of ä | sc It is pointed out that the Porto bello station is extremely well placed for 42 ft no fewer than ten of these machines the supply of coal and condensing water with a total capacity of at least 600,000 and although the same advantages would k W could be accommodated. The last be available to a station built anywhere few stages of the low pressure end will near the coalfields on the Forth F.stuary probably be quadruple flow into a single the erection of this and th e duplication of auxiliary services already available at Portobello would be costly. It is estimated that a new station with two 50,000- kW sets and services would cost at least £4^ million. Careful examination was made of the possi bilities of the present site. • Suitable adjacent land is The Portobello power station, Edinburgh already occupied and could not be taken over, it is stated, condenser shell, one half of which can be cleaned while on full load at slightly reduced without great discomfort to the people con cerned. The question therefore arose as to vacuum. Actually this design of cross-compound the possibility of accommodating new plant -Bscs i in the existing building. The possibility machine need only be a foot or two longer when designed for capacities up to 100,000 was encouraged by the fact that the original kW , the difference being almost entirely in plant, installed in 1922, has reached the end the length of the 3,000 r.p.m. generators. of its useful life and is in a poor state of The blading would be somewhat longer, repair and grossly inefficient, even compared making the steam casings only slightly more with new plant at the same steam pressure bulky in diameter, and both from the electrical ■feZ at the other end of the building. There was and steam points of view such an arrange and Z accordingly much to be said for scrapping ment should be easy to build, only com this old plant and installing new plant with paratively small parts and forgings being the most modern steam conditions, provided necessary for the steam and electrical ends. that this resulted in a substantial increase in While it is comparatively easy with suitable * 6 designs to get much larger plant capacities The turbine room is about 460 tt long and a/W into existing turbine houses it is generally a 57 ft wide with gantry columns at 21-tt nqiiff much more difficult problem with boiler centres. Consideration was first given to steeple plant. Indeed, it would be impossible to compound machines of the (Ford) River make any substantial improvement in space Rouge type with two standard 30-M W gener utilisation without adopting the unit boiler- ators one on top of the other, both running turbine layout. The Portobello boiler house at 3 000 r.p.m. with h.p. and l.p. steam is about 89 ft wide, excluding annexe, by cylinder heat drops arranged to suit, but 2 32 E l e c t r i c a l R e v ie w A u g u st 9, 1946 440 ft long, and it was found that a maximum 900-lb plant would be of the order of 4-5 per of eight 540,000 lb per hr pulverized fuel cent and if equal reliability could be achieved boilers could be accommodated in this it was certainly well worth having. space at 54-ft centres, which is admitted to It was finally decided therefore to go ahead be fairly close spacing for the size of unit with the 1,350 lb 950 deg initial condition, considered. This arrangement would have but to ensure availability by the device of admitted of the installation of about 480 M W deliberately catering for removal of blading or so in the existing building. The main in a prearranged manner so that the turbine chimney flue and 360 ft chimney are of just could give its full output at 900 lb 900 deg F about sufficient size at the thermal efficiency with substantially reduced feed water heating envisaged to accommodate the gas from this temperature, thus enabling the turbine to number of boilers, admittedly with rather pass the required weight of steam without high draught losses at maximum rating. any prejudice to its efficiency at the design Eventually, however, it was agreed with conditions of 1,350 lb with 450 deg F feed the Central Electricity Board that the water. Temporary alteration to the boiler best development would be six 60-M W sets, for such a change in steam conditions is a the first two boilers to be at 68-ft centres, rather more difficult problem, particularly and this is the arrangement now to be in the balance of latent heat to superheat adopted. No alteration whatsoever is under the two separate conditions, and also required in the turbine room, apart from in the problem of taking away the much removing the foundation block of the larger volume of steam involved at the lower existing machine, but the roof of the boiler- pressure, but it is felt that this problem will house will have to be raised by about 40 ft. also be successfully overcome. It is not intended that the efficiency ratio Choice of Steam Conditions of the plant should be quite as good at the In choosing the steam conditions, it was reduced pressure of 900 lb since the need for essential to consider availability first and to operation at reduced pressure will probably go only so far in the search for thermal only be of a temporary character, if indeed efficiency as this main consideration would it is required at all. The provision of permit. The unit boiler arrangement with reduced pressure operation has been made pulverized fuel firing has already shown, because the plant situation in the country is particularly in the United States, about so acute that no hold-up or restriction in equal availability as between the boiler and the output capacity on account of “ teething turbine it serves, thus justifying the unit troubles ” with high steam conditions could arrangement. Furthermore, American and be tolerated for any length of time. British experience has indicated that there The cost of the first part of the new plant is no inherent disadvantage in very high is put at £1,250,000, the second set will cost pressures as such. The problems are almost the same, giving a total of £2j- million entirely a matter of inlet steam temperature. against the estimated cost of £4^ million for The cost and complication of reheating, a new station with an initial installation of however, and particularly the governing two 50-MW sets. The annual saving is difficulties which might ensue in Scotland calculated at nearly £200,000 per annum for when operating in parallel with hydro twenty years. It is hoped that the first set electric plant and possibly isolated from the will be in operation in two and a half years; remainder of the grid are such that this the building of a new station would require type of plant could not be seriously con about four years. The consulting engineers sidered at present. The question therefore are Kennedy & Donkin. was how far to go with a standard steam cycle. Pressure of 900 lb at 900 deg F was Bailie Memorial Prize considered absolutely safe with present A N annual prize of two guineas is to be technique, but it was felt that recent progress -‘r*- awarded to the reader of the most both in the United States and in this country meritorious paper (not otherwise awarded a justified taking the further step of 1,350 lb Council premium) at the North Midland at the throttle with 950 deg F total tempera Students’ Section of the I.E.E. It is to be ture, with feed heating at 450 deg F at known as the Bailie Memorial Prize and will be provided from a fund created for the purpose maximum rating and with the highest some years ago in memory of the late Mr. J. vacuum consistently possible, namely 29-1 in. D. Bailie, a former hon. secretary of the Leeds Hg. The improvement in fuel rate over the C en tre. August 9, 1946 E l e c t r i c a l R e v ie w 233 ELECTRICITY SUPPLY Tidal Power Scheme. Finchley Rate Relief Explanation. B ed fo rd .— New Switch-house.— The founda in all new Council houses and supplied on the tion stone of a new switch-house at Austin same basis for new property erected and wired Canons was recently laid by Alderman W. E. by private contractors, provided that consumers Sowter, M .B.E. He said that it had been decided agree to take, in addition to a supply for lighting, to take a supply at 33 kV from the switch-house etc., at least two of the following power services : and to interconnect with the Prebend Street power plugs, cooker, washboiler or water heater. generating station by three 33-kV underground Consumers not taking the minimum power feeders through three 15,000-kVA 33/11-kV supply must pay a proportionate part of the transformers. Later, substations would be cost of the service unit. installed at other strategic points, to reinforce F in ch ley.—Rate Relief “ Because of Un the existing high-voltage network. The rate of certainty.” — From the net profit of £23,234 on the increase in consumption was such that the past year’s working of the Electricity sales were doubling every nine years, without Department, £5,731 is being contributed to rate taking into consideration the special loads relief. The chairman of the Electricity Com anticipated in the future (such as the Thurleigh mittee (Councillor P. Lawrence) said that it aviation research station and the Cranfield would not be possible to reduce tariffs owing to Aeronautical College). the increased cost of labour and materials. He Berkshire. — New Cables and Lines. — deplored the delay which was taking place in The Highways and Bridges Committee of the the announcement of definite proposals regard County Council has received particulars of ing the terms upon which undertakings would proposals by electricity undertakings to erect be acquired, and said that it was because of this 26 overhead lines and lay three underground uncertainty that the Committee decided to cables. recommend to the Council that a portion of the Blackburn.— Factory Supply.— T h e E lec past year’s profit should be used for rate aid. tricity Committee has authorized the provision It was not known whether the acquiring authority would be empowered to take over liquid of a supply of electricity to J. H. Haydock & Sons’ Eclipse Mill, Feniscowles. The cost will balances, and there seemed to be no purpose in building up their reserve fund to an unneces be £ 3,172. sarily high level. Bournemouth.—Cooking at Sanatorium.—. The Corporation Health Committee is to provide Friern Barnet.—Electric Water Heating electric cooking facilities at a cost of £237 at Recommended.— Owing to the high capital the sanatorium. cost of gas water heating installations in flats on the Alexandra Road estate, the difficult B righ ton .— Domestic Appliances.— T h e E le c position with regard to the supply of such tricity Committee is seeking sanction to borrow heaters and bearing in mind that 60 per cent £25,000 for domestic electrical apparatus. of people have asked for electric cookers, the B u sh ey.—Street Lighting.— The U.D.C. has Housing Committee has considered the question arranged for the W atford Corporation Electricity of installing electric water heaters. The North- Department to erect 50 street lamps on the met Power Co. has offered favourable rates for Hall Farm estate. electricity consumed, on the basis of the Council Cheltenham.— Electricity for Estate.— T h e paying a fixed charge for the whole of the flats, Electricity Committee is to provide a supply to which can be reclaimed in the rents, the occupiers the New Barn estate, Prestbury, at a cost of paying direct for the electricity consumed. In £4,777. view of the benefits to the tenants under this scheme the Committee recommends its adoption. C oven try.—Higher Charges Proposed.— The Electricity Committee recommends increas G o u ro ck .—Sodium Lighting.— T h e T o w n ing electricity tariffs by 20 per cent. Council has adopted the sodium system of electric street lighting which is at present in use Croydon.— Loans Sanctioned.— The Electri in parts of the neighbouring burgh of Greenock. city Committee has obtained sanction to borrow £2,000,000 for the new power station, £15,000 G u ildford .—Hire of Apparatus.— A t a m eet for mains and services and £5,000 for sub ing of the Electricity Committee the electrical station s. engineer reported that moderate supplies of Dalton-in-Furness.— T id a l Po w er P la n .—- electrical domestic apparatus would be available in the course of the next three months and the A £6 500 000 scheme for a hydro-electric tidal Committee decided to put the hire and hire- power station and causeway over the Duddon estuary from Askam-imFurness, N.W. Lancs, purchase schemes into operation the moment apparatus can be obtained. to Hodbarrow, West Cumberland, has been put forward by Mr. C. Frobisher, surveyor and Lichfield.— Electricity Charges.— A s there engineer to the Dalton-in-Furness Council, and was a loss of £1,969 on the past year’s working snhmitted to the Government and Lancashire of the undertaking and it is anticipated that Cou^tv Council. The plan provides for a 50 ft there will be a deficit this year of about £5,731 w u le h ig h w a y and double track railway linking if prices are not adjusted, the Electricity Com mittee recommends an increase of 10 per cent, the two counties. Eccles — Service U n its.— On the recom- which is estimated to yield £3,898 in a year. mir.dation o f the electrical engineer the Elec- London.— Electric Pumping Plant. — T h e trin?tv Committee has decided that standard Metropolitan Water Board is to remodel the h ou se service units shall be in stalled free of cost Cricklewood pumping station and install / 2 3 4 Electrical Review A u g u st 9, 1946 electric pumping plant at a cost of £21,190. The than independent operation costs plus 2 i p er Board also proposes to install electrical plant cent, the capital cost of the cables, switchgear, at the Crayford pumping station at a cost of etc., to be paid by the firm. £13,500. Coal Handling.— The Electricity Committee has obtained sanction to borrow £193,430 tor Reading. — Increase in Tariff. — T h e the coal handling scheme. Electricity Department has issued notices to consumers stating that, in consequence of the W a tfo rd .— Ban on Erection of Kiosks heavy increase in the cost of coal and other R elax ed .— After the Town Planning Com expenses, the tariff will be increased after the mittee had refused to allow the Electricity third quarter of 1946, subject to the concurrence Department to place kiosks in Horseshoe Lane of the Ministry of Fuel and Power. The and St. Albans Road the electrical engineer published scales show that under the domestic made representations as to the difficulties that two-part tariff it is proposed to increase the would arise if permission were not granted. standing charge by 50 per cent, the running The Committee has now agreed to sanction the charge being 0-75d. where an electric cooker or kiosks as a temporary measure only so that thermostatically controlled water heater is electricity may be made available to new used, or "otherwise 0-95d. housing estates. St. Pancras.— Refrigerators.— Recently the Electricity Committee authorized the purchase Overseas of 500 built-in domestic type refrigerators for E g y p t.— Assuan Dam Scheme.— E g y p t use in connection with rehousing schemes. plans to widen the Assuan Dam considerably After considering whether the cost of installa so that it will produce electric power for the tion should be met by adding a charge to the neighbouring iron mines. In addition a large rent, the Committee has agreed with the Hous power station is to be erected in the northern ing Committee that a hiring charge would be a part of the country which lacks waterfalls. more suitable method of meeting the cost as This was announced by the president of the each refrigerator will be installed in a cupboard Egyptian Hydro-Electric Commission on his and can be removed if not wanted. arrival at Stockholm after concluding an Revision of Charges.— The Electricity inspection tour of Swedish power stations. Committee recommends various tariff revisions The president said that an agreement had estimated to yield additional revenue of £17,666 already been concluded and the first two turbines for the financial year. from Sweden were to be delivered to Egypt in Salford.— H.v. System Reorganization.— September. When completed the power station The Light Heat & Power Committee is to at Assuan will develop 350,000 kW .— Reuter. reorganize the 33-kV network system at a cost of £225,570. E ire .— Peat Power Station.— The construc tion of the Electricity Supply Board’s peat Staffo rd .— Estate Development.— A su b power station at Portarlington, which is expected station, mains and services costing £15,000 are to to be ready for working towards the end of be provided on a new housing estate at Rising 1948, has now begun. The building contract B ro o k . has been obtained by the Irish Engineering & Stockton-on-Tees.— Fluorescent Lighting.— Harbour Construction Co., Ltd., Dublin. At the July meeting of the Town Council a Contracts were previously placed in England report was submitted by the general manager for two 12,500-kW turbo-generators, three and engineer of the Electricity Department boilers, transformers and switchgear. The (Mr. N. Hunter), on the advantages of fluores question of building further turf-burning cent lighting, particularly the new types of tubes stations is being studied. and fittings, and it was resolved that arrange Start on Rural Scheme.— It is re ments should be made for a demonstration of all ported that the Electricity Supply Board is types of fluorescent fittings at the showrooms. starting work shortly, north of Finglas, Co. Supply to Housing Estates.— The general Dublin, on the first area under the rural elec manager reported that to afford a supply of trification scheme. Similar areas of 20 to 25 electricity to the Fairfield and Newham Grange sq miles in other counties are being examined housing estates it would be necessary to extend with a view to a start being made next year. from the 11-kV system, and to install two new substations, at a total estimated cost of £8,095 and £9,060 respectively. It was decided to apply TRANSPORT to the Electricity Commissioners for the neces sary sanction. Bournemouth.—Trolley-bus Route Exten sions.— The Transport Committee is to make Twickenham.— Immersion H eaters.— A t a preparations for the extension of trolley-bus meeting of the Corporation Health Committee rou tes. a marked increase in the consumption of electricity was reported. It was felt that the B righ to n .— Year’s Surplus.—The Corpora increase was partly due to the considerable use tion Transport Committee reports a net surplus of immersion water heaters and the Committee on the trolley vehicles of £31,499 and on the decided to make inquiries as to the advisability motor buses of £9,982. of supplying a new and more economical type of Southend-on-Sea.—Extension of Time.— T h e immersion heater. Minister of Transport has made the Southend- Warrington.—Supply to New Works.— on-Sea Corporation (Trolley Vehicles) (Ex Terms have been arranged by the Electricity tension of Time) Order, 1946 (S.R. & O. 1946 Committee with Lamportes for a 1,400-kVA No. 1220). This extends for three years the supply to their new works with a consumption time for the operation of trolley vehicles upon of 11 000,000 kWh per annum, subject to the the whole of the route authorized by Section 4 cost of the supply being not less at any time of the Corporation’s Order of 1934. August 9, 1946 E l e c t r i c a l R e v ie w 235 RECENT INTRODUCTIONS Notes on New Electrical and Allied Products Room-Drill-Switch So long as both pilot and earth connections are continuous the operation of the switch on ^IIN CE the introduction of their flameproof the drill closes the main contactor. The latter room-switch for coal conveyors in mines, can then be opened by the release of the switch A . R e y r o lle & C o ., L td ., Hebburn-on-Tyne, on the drill, by the operation of the over have produced a similar room-drill-switch of current or earth-fault equipment, by opening 1-75 kVA at 615/125 V three-phase for separate the isolator, or by any attempt to disconnect the plugs and sockets connecting the trailing- cable to the panel or machine. Standard detachable cable boxes may be jointed and compounded, if required, away from the switchgear, which can be added to or removed very quickly. Grinding Dry Battery Carbons The productive capacity of a centreless grinding machine upon such work as the finishing of carbon sticks for dry batteries has hitherto been limited to a very considerable extent by the ability of the operator to keep the machine supplied with work. The process is materially speeded up by a new type of auto matic feeding hopper recently developed by Mining room-drill-switch Arthur Scrivener, Ltd., Tyburn Road, Birmingham; the illustration shows the hopper single circuits, or for forming part of a multi working in conjunction with a centreless grinder. panel board controlling conveyor, loader and By means of this combination standard carbon drill circuits. Within the skid-mounted welded sticks of 6 mm diameter by 54 mm long are steel main enclosure are two entirely separate flameproof compartments. The upper accom modates three 300-A air-insulated copper busbars, which terminate at each end of the panel in flameproof bushing-type terminals, and a triple-pole air-break reversing isolator capable of breaking full load current and fully interlocked so that it must be in the “ off ” position before the lower compartment becomes accessible. All connections from the busbar enclosure to the lower compartment are taken through flameproof bushes, which are near the front of the panel to allow easy access. The lower compartment contains a three- phase main transformer of 1-75 kVA and a ratio of 625, 600, 550, 500 or 440 to 125 V; a single-phase auxiliary transformer for the control-circuit with primary taps as for the main Automatic feeding hopper and centreless transformer and a 25-V secondary; a triple grinder for dry battery carbons pole main cartridge fuse-board to protect the primary circuit against short circuits; a triple ground to a tolerance of 0 001 in. at the rate pole electrically-operated contactor in the of 30,000 per hour, which is probably from primary circuit, the operating coil acting as an twelve to fifteen times the rate obtainable by under-voltage release; earth-fault protective hand. equipment for the 125-V circuit and to open and lock out the primary contactor on the Domestic Appliances occurrence of an earth fault; and a three-pole thermal time-lag over-current relay, which also To the range of household appliances offered has an electromagnetic action giving instan by British Diamix, Ltd., Metrum Works, taneous short-circuit protection, connected in Beatty Street, Camden Town, London, N.W .l, the secondary circuit but arranged to open the has been added a “ Streamline ” clothes iron which is nickel plated or enamelled in various primary contactor. 2 3 6 E l e c t r i c a l R e v ie w August 9 , 1946 pastel shades of colour. An improved version and mechanism, which is mounted on the end of the open type boiling ring, loaded to 750 or of the cubicle after removing the current 500 W, has a mottled enamel top-plate and control hand wheel. The latter is later fitted coloured base. There is also a double-ring to the spindle of the automatic device so that model of similar loading with a switch mounted control can also be carried out by hand if centrally in the base for separately controlling d esired . one of the two elements. By short circuiting the electrode holder with “ earth ” the current is reduced. If it is Laminated Insulating Material required to increase the current the electrode As a result of the activities of the research holder is momentarily short circuited with department of the New Insulation Co., Ltd., “ earth,” broken and immediately short Bristol Road, Gloucester, a number of new uses circuited again, which is the equivalent of a have been found for “ Permali ” which is an “ dash ” for lowering and a “ dot ” and “ dash ” for raising current. Reflector Fires The range of movable radiant fires being manufactured by Ferranti, Ltd., Hollinwood, Lancs, includes the “ Minera ” models with loadings of 750 W, and 1, 1-5 and 2 kW, which are made in two sizes embodying 10 and 14 in. elements. A useful feature is that they can be adjusted to any angle by means of spring feet. The reflector is made of polished chromium, but a“ Solium ” alternative is expected in the near future. The 2-kW “ Corona ” is a decorative type intended to be set into the opening of a tiled surround. Large diameter end cover in fabricated P e r m a li A flame coloured glow from the impregnated laminated densified wood with base floods the whole reflector and surround; high dielectric and mechanical strength. It it can be switched on independently of the is being used for components of transformers, heating element. Although designed in 1939, low-voltage distribution and fuse gear, and this model is not yet being made in bulk, but railway signalling track circuit joints, as well will soon become available fitted with chromium as for high-voltage switchgear. oxy-silver and “ Solium ” oxy-copper reflectors In electrical machines “ Permali ” has been in addition to the new “ Ambronze ” finish. used for rotor and stator packing blocks and slip-ring barriers, and the illustration shows an Wash Boiler alternator end cover which has been produced. The sole Mid This large-scale fabrication in a non-metallic lands distributors material eliminates eddy-current losses. The of the “ Verona ” curved panels are moulded to shape in the wash boiler for pressing operation and all joints are completely home laundry pur airtig h t. p oses a te F r a n k Many of the company's products are a com Wf.sterman bination of “ Permali ” with bakelized paper (Wholesale) Ltd., tubes, as for instance such assemblies as busbar 94, Dale End, Bir spout insulators, through type terminal boards mingham, 4. The and similar insulators. tinned copper in terior tank is of 10 Welding Current Control gallons capacity, An automatic method of adjusting welding loaded to 3 kW ; current from a distance without the operator two switches re having to leave his work to attend to the cessed into the machine is announced by Murex Welding right-hand side Three-heat clothes wash b o ile r Processes, Ltd., Waltham Cross, Herts. provide three-heat Additional cables are not needed since adjust control while the draw-off tap is semi-recessed. ment is effected by the short circuiting of the The square body of the wash boiler, gal electrode holder to the work. vanized steel or vitreous enamelled, is 30~in. The device can be fitted to standard a.c./d.c. high. The aluminium top, 19-f in. square, is motor-generator equipment and comprises a fitted with a hinged lid which is recessed to small steel box containing relays, electric motor form a flat top. A u g u st 9, 1946 E l e c t r i c a l R e v ie w 55 c a n t w C &Cip-xing motoxi p t a m Oil immersed combined rotor and stator starter with or without isolator up to 90 H.P. 400/440 V. Oil immersed rotor and stator control panel for motors up to 250 H.P. 400/440 V. WORKS: ASTON, BIRMINGHAM 6 Sales Headquarters: BRETTENHAM HOUSE, LANCASTER PLACE. W.C.2 A u g u st 9, 1946 56 BUPD£TT£E l e c t r i c a l R e v ie w STONHOUSE WORKS, CLAPHAM LONDON, S.W.4 DAY and NIGHT 4 I I i FOR RELIABLE SERVICE STATOR OF AUTO-SYNCHRONOUS MOTOR REWOUND AT OUR WORKS WE REPAIR • REWIND • REDESIGN A.C. and D.C. MOTORS ■ ALTERNATORS ■ ROTARY CONVERTERS CONTROLLERS NOTHING TOO SMALL — NOTHING TOO LARGE W E COLLECT AND DELIVER Established over 35 years A u g u st 9, 1946 E l e c t r i c a l R e v ie w 237 FINANCIAL, SECTION Company News. Stock Exchange Activities. tion of Aberdare Cables of South Africa, Ltd., Reports and Dividends was impending. A site had been acquired at C. A. Parsons & Co., Ltd.— The annual meeting Port Elizabeth and a new factory would shortly was held recently when Sir Claude Gibb (chair be in course of erection. In addition to cables, man and managing director) said that they other electrical devices developed by their had always relied on export orders to maintain subsidiary company, South Wales Switchgear, a steady works load factor. Total orders Ltd., would be manufactured at the Port received last year exceeded £3,000,000 in value, Elizabeth works. and the export orders received for turbo- The volume of business, both for the home alternators were greater in value than home orders and export markets, continued to rise and they for similar equipment. During the year plant were re-establishing their pre-war connections had been shipped to Australia, Canada, India, with a number of countries, substantial orders Russia and South Africa, while at home still having been received from Finland, Norway and another 50,000 kW turbo-alternator had been many other countries. During the war a section started up at Hams Hall “ B,” Birmingham, and of the works was engaged on the manufacture another 40,000 kW unit at Earley, near Reading. of drawn copper wire for the G.P.O. to whom With the falling off in searchlight mirror orders they supplied over 10,000 tons. With the there had been a marked increase in cine cessation of hostilities they had to find other matograph mirror inquiries and they had decided markets and substantial orders from many to install special plant to cope with the territories had been received. The shortage of anticipated demand for such mirrors. steel tape for armouring cables, and of lead and They had decided to bring their works up to other materials hindered the flow of production, the necessary maximum efficiency by spending and they had many miles of cable partly finished £1,000.000 at Heaton and Walkergate works. due to the lack of some material or other. The effect of this improved plant would be They were now engaged in entering new felt partly during 1946 and would make possible fields, the factory space for which had been the large output to which they were committed allocated and plant was being installed. The in 1947. Their research staff had been aug new factory at Blackwood of South Wales mented and greatly strengthened. Careful Switchgear, Ltd., was in operation and was attention had been given to the internal com engaged in the production of wash boilers, bustion or gas turbine for many years, and the electric cookers and immersion heaters. The commercial size experimental unit, now under Treforest factory was fully extended in the test, was shaping well and teaching their de manufacture of switchgear and transformers. signers a great deal. In association with Ultra Electric (Holdings), Ltd.— In the course A. Reyrolle & Co., Ltd., who designed and of his speech at the annual meeting held on built the manoeuvring and control gear, Heaton July 24th Mr. E. E. Rosen (chairman) said works designed and built the turbo-alternators that their radio products were on the market and large synchronous motors for the turbo again before the end of 1945, and they had electric propulsion of the four new Canadian continued production at a rate which compared Pacific " Beaver ” boats. favourably with the rest of the industry. During The Revo Electric Co., Ltd.— In his speech the war they expanded their activities in the at the recent annual meeting of the company, development and production of both radio Mr. B. Silcock (chairman) said that practically location and electronic equipment of a the whole of the production area of their specialized technique. It was their intention factory, formerly occupied by redundant to continue in this new branch and development Government plant, was now iiyailable for work in association with the Government and peacetime production. A new building had leading aircraft manufacturers was proceeding. been erected to augment the housing fitments Their electrical and radio communications programme, and other extensions were con apparatus was already being fitted in the latest templated in the iron foundry and fittings and most up-to-date British civil aircraft in sections In addition new plant for specialized this country and overseas. production had been installed with mechanical The British Vacuum Cleaner & Engineering tracks for the assembly of domestic cookers, Co., Ltd., reports a net profit for the year and the tool room equipped to meet the demands ended September 30th last of £44,752, as of mass production technique. They were compared with £83,954 for 1943-44. The final heavfiy engaged on the production of electric ordinary dividend is 13f per cent (against cookers 1 v. switchgear and other products for 17} per cent), making 20 per cent for the the national housing programme, and they n9w year (against 30 per cent). had in full production a new consumers service unit They also looked forward to increasing The London Electric Supply Corporation, Ltd., demands for their street lighting equipment and has declared an interim ordinary dividend of iheTr fluorescent lighting equipment. 2 per cent, less tax. No interim dividend was paid last year, the final payment being 3 per j rahles Ltd.— Expansion of the com- cent, together with a further 3 per cent drawn Ab-£r business and its entry into new fields from reserve. pany pfprred to by Sir George Usher (chairman) werenre /nnual meeting held recently. The Richardsons, Westgarth & Co., Ltd., report a atn M^fv Aberdare Cables (Overseas), Ltd., net profit for the year to March 31st, after had*been voluntarily wound up, and the forma providing for tax, of £87,333, as compared 238 E l e c t r i c a l R e v ie w A u g u st 9, 1946 with £62,880 for the preceding year. The tractor carried on by Albert Baker at Malcolm ordinary distribution for the year is raised Road, Shirley, Warwickshire. Directors : from 8 per cent to 12 per cent by a bonus of A. Baker, 43, Malcolm Road, Shirley, W arwick 4 per cent. shire, and C. L. Hadgkiss, 39, Malcolm Road, Shirley. Registered office: 159, York Road, report that the net trading A. C. Cossor, Ltd., Hall Green, Birmingham. profit for 1945-46 was £225,054, against £335,691 in the preceding year. To this is added £55,000 P. A . Ridgers, Ltd.— Private company. Regis representing one year’s dividend from the tered July 5th. Capital, £5,000. Objects: To Sterling Cable C o.; last year £90,000 (three acquire the business of electrical and radio years’ dividend) was received from this source. engineering carried on by P. A. Ridgers at The net profit was reduced from £179,430 to Electric House, Bracknell, Berks. P. A. Ridgers, £129,001. The ordinary dividend is main Chaddlesworth, Church Road, Bracknell, is tained at 12£ per cent free of tax and the balance permanent governing director. Secretary: Mrs. carried forward is raised by £51,501 to £162,826. Florence E. Ridgers. Registered office: Electric Last year £110,000 was written off goodwill. House, High Street, Bracknell. P y e , Ltd., report net profits of £120,077 for Dawn Electric Construction Co., Ltd.— P rivate 1945-46, an increase of £4,270, after providing company. Registered July 4th. Capital, £1,000. for E.P.T. and deferred repairs. To meet other Objects: To cariy on the business of electricians, taxation £65,000 is set aisde and £5,000 is put mechanical engineers, etc. Solicitors: Lipton to staff pension fund. No allocation is made & Jefferies, Princess House, 39, Jermyn Street, to general reserve (£33,766 last year from S .W .l. reserves no longer required in respect of sub Press & Head (Electrical Contractors), Ltd.— sidiaries). The 8 per cent, cumulative partici Private company. Registered June 27th. pating preferred ordinary stock again receives Capital, £100. Objects: To carry on business 10 per cent, and the deferred ordinary dividend as indicated by the title. Directors: C. E. is maintained at 25 per cent. The balance Press, 18, Highbury Place, Ely, Cardiff, and carried forward is raised from £129,583 to three others. Registered office: 15, Dumfries £ 142,076. Place, Cardiff. Calcutta Tramways Co., Ltd.— It is reported thaj the Bengal Government is to introduce a Permelectric, Ltd.— Private company. Regis new Bill (in the place of the previous one which tered June 28th. Capital, £500. Objects: has lapsed) to enable the Calcutta Corporation To carry on business as electrical manufacturing to raise a loan for the acquisition of the com and mechanical engineers, etc. Directors: pany’s undertaking. C. V. Stead, 8, Grove Street, Didsbury, Man chester, and two others. Secretary: W. M. Gabriel, Wade & English, Ltd., are m a in Ashton. Registered office: 8, Grove Street, taining their dividend at 10 per cent (including Didsbury, Manchester, 20. 4 per cent bonus). The net profit was £99,341 (against £94,701). B . French (Eire), Ltd.— Private company. Registered in Dublin June 26 th. Capital, The City of London Electric Lighting Co., Ltd., £4,500. Objects: To carry on the business of is again paying an interim ordinary dividend of electricians and electrical contractors, electrical, 2 i p e r cent. mechanical and general engineers, etc. B. New Companies French, of Kidderminster, is the first director. Standard Electric Co., Ltd.— Private company. London Electric Firm, Ltd.— Private company. Registered June 28th. Capital, £2,000. Objects: Registered July 24th. Capital, £50,005. Objects: To acquire the business of a dealer in electrical To acquire the business carried on as the London equipment carried on by John M. Beaumont at Electric Firm and to carry on the business of Standard Buildings, Huddersfield, as Standard manufacturers of, and dealers in, searchlight Electric Company. Secretary: Ida Maynard. projectors, floodlights, spotlights, headlights, etc. Directors: Elsie V. Elughes, 99, Purley Epsom Electrical Equipment Co., Ltd.— P rivate Downs Road, Purley, Surrey; and Gwen. S. company. Registered June 24th. Capital, Smith, 97, Eyre Court, St. John’s Wood, N.W . £2,000. Objects: To carry on the business of Registered office: Brighton Road, South electricians, etc. Directors: T. A. Purdom, C ro y d o n . 146, Stonecot Hill, Sutton, Surrey, and two Ariel Electric Co., Ltd.— Private company. others. Registered office: 66, ’ Buttesland Registered July 11th. Capital, £100. Objects: Street, N .I. To carry on business as indicated by the title. Directors: D. Singer and Mrs. Daphne Singer, Liquidations b o th of 57, Queen’s Drive, N.4. Secretary: H. Whitaker. Registered office: 11 Argyll United Electric Tramways Co. of Caracas, Ltd. Street, W .l . — Winding up voluntarily. Liquidator, Mr. Fluorescent Lighting Equipment Co., Ltd.— J. D. Barber, 117, Old Broad Street, London, E .C .2 . Private company. Registered July 23rd. Capital, £100. Objects: To carry on the business of manufacturers and repairers of, and dealers Bankruptcies in, fluorescent fighting equipment, electric and A. W . Schofield and D. Tanner, fo rm erly quartz lamps, reflectors, etc. Registered office: trading together in co-partnership at 673, Man 168, Victoria Street, S.W .l. chester Road, Denton, under the style of Baker & Hadgkiss, Ltd.— Private company. Schofield & Tanner, electrical and radio en Registered June 28th. Capital, £500. Objects: gin eers.— S u p p le m e n ta l d iv id e n d o f 4s 6J-d in To acquire the business of an electrical, radio the £ Payable August 23rd at the Official and mechanical engineer and electrical con Receiver’s Office, 20, Byrom Street, Manchester A u g u st 9, 1946 E l e c t r i c a l R e v ie w 239 company with the intention of writing up its STOCKS AND SHARES capital to a figure more in keeping with the S T° CK: EXCHANGE markets are dull and assets and earnings position, if and when the prices somewhat depressed. Cessation of ban on such transactions is relaxed. E.M.I. are uymg on the one hand, and a mild selling easier at 32s. 6d. pressure on the other, are the chief, if humdrum, explanations for a fairly general decline in prices. Fluctuations in Prices Holiday influences and the conflicting currents Home electricity supply shares have held their that have appeared at the Peace Conference are ground with conspicuous firmness. County of factors in the situation, to which must be added London are better at 42s. 6d. and Newcastle the competition, already mentioned here, of Electrics gained Is. at 31s. Southern Areas new issues. Business has fallen off to a con went back to 21s. 9d. The equipment and siderable extent. The award made to the coal manufacturing list shows a good many falls. companies caused an improvement in their Amongst others are British Insulated 45s. 6d., share quotations. Associated British Engineering 55s., Brush The Central Electricity Board has obtained a 10s. 6d., Revo 54s. 6d., Ever Ready 47s., Special Order authorizing it to raise another Cromptons 32s. 6d., De la Rue 12, and Walsall £30 million, mainly for extension work. The Conduits 57s. Thorn Electrics are 30s. ex money will be spent by degrees, of course, and rights. Hopkinsons are jg up at 5 and as opportunity offers. Its expenditure will give Heatrae hardened to 8s. H. J. Baldwins much employment to companies engaged in the recovered to 12s. 9d. British Vacuum Cleaner type of work required by the Central Board, fell 2s. 6d. to 25s. on reduction of the dividend but the programme is at present too nebulous from 30 to 20 per cent. for share prices to be affected. Company Meetings Cables and Transport In the dull state of markets, General Electrics Cable & Wireless ordinary at 1091 is 4 points have slipped back to 98s. 9d. This is 11s. 3d. and the preference at 1111 is 2 points lower on below the recent best, and brings the yield on the failure— so far— of the opposition to defeat the last dividend to £3 11s. per cent. .Sir Harry the Bill for the nationalization of the operating Railing’s address at the annual meeting left company. The chairman told the House of impressions of the financial strength of the Lords Select Committee that the future policy undertaking, the breadth of the business, the of the holding company had received no con great present demand for the products and sideration whatever, the board having been the difficulty of supplying it because of shortages “ wholly engaged on dealing with the situation in men and materials. On the subject of at present before us.” nationalization, the chairman urged that the Globe Telegraph ordinary are Is. 6d. down practical matter of production should have first at 42s. 6d. British Electric Traction deferred consideration. The report of the Chloride has fallen 20 points, to 1105, and the 8 per cent Electrical Storage annual meeting gives another preferred 4, to 178, on nationalization possi indication that shortage of materials is among bilities. Thomas Tilling are easier at 52s. and the chief obstacles to a large expansion of Home Railway stocks, allowing for ex-dividend production in the electrical equipment field. markings, are also lower, Transport “ C ” at At the Revo Electric meeting, the chairman 56i and Southern 5 per cent preferred at 69J. stressed the fact that the present seller’s market The Indian disturbances led to a drop of 5s. to would not last indefinitely. 70s. in Calcutta Trams, and of 4s. to £3 in New Capital Calcutta Electrics. Madras Electrics at 40s. are down a florin and Cawnpore Electrics 3s. British Thermostat has announced a proposal to double the present authorized capital of to 56s. 3d. £150,000 and to offer 100,000 new 4^ per cent Radio Shares preference shares to ordinary shareholders at Tn a weak radio share market, A. C. Cossor 21s. in the ratio of one for every six ordinary have declined further to 35s. since the declara held. British Rola directors have cleared up a tion of the final dividend and bonus, which misapprehension about the respective dividend again bring the total for the year up to 12± per rights of the old and the newly-issued ordinary cent tax-free. The price is ex-dividend and shares. No dividend, other than the 15 per ex rights to the new shares, which are changing cent already declared, will be recommended for hands at Is. 6d. premium. Profits for the year the year ended in March. As soon as the old ended last March are down, according to the shares are quoted ex-dividend, the new will preliminary statement, from £179,000 to rank equally with them for all dividends to £129 000 but the former figure included three come. New shares recently issued at 27s. 6d. vears’ dividends from the Sterling Cables by Thorn Electrical Industries are quoted at interest against one for the last period. Decca Is. 3d. premium. The new English Electric Is shares have moved against the tide with a 3f per cent preference, offered at 20s. and „renounced recovery to 3 k ; later, the price promptly subscribed, were quoted at Is. relapsed to 58s. 9d. Rumour credits the premium on the opening of the market in them. 240 Electrical Review A u g u st 9, 1946 IEW PATENTS Electrical Specifications Recently Published The numbers miller which the specifications will be Pitcher.— “ Manufacture of air-cooled vapour printed and abridged are given in parentheses. electric arc converters.” 7182. June 6th, Copies of any specification (Is. each) may be 1941. (579049.) obtained from the Patent Office, 25, Southampton General Electric Co., Ltd., and R. S. Rivlin.— Buildings, London, W.C.2. “ Mounting of piezo-electric crystals.” 13925. A KT.-GES. Brown, Boveri & Cie.— October 29th, 1941. (578955.) 4*- “ Protective device for ball and roller General Electric Co., Ltd., and J. W. Ryde.— bearings.” 13338/45. May 26th, 1944. (578989.) “ Wireless receiving apparatus.” 16833. G. B. Banks and N. Levin.—“ Electric November 23rd, 1940. (578952.) tuned oscillatory-circuit devices.” 6280. H. W. Hastings-Hodgkins and Kinetours, May 8th, 1942. (578877.) Ltd.— “ System for the electrical transmission British Insulated Cables, Ltd., and J. F. of correspondence control and torque.” 10523. Cowen.— “ Resinous lacquers or enamels and June 29th, 1943. (579056.) products therefrom.” 13963/43. January 8th, International Combustion, Ltd., and W. 1942. (Divided from 576384.) (578882.) F. Harlow.— “ Steam boiler plants and other British Insulated Cables, Ltd., R. Blackburn heat exchange apparatus.” 1 1788. June 21st, and C. H. M. Thorpe.— “ Terminal connectors 1944. (Addition to 566108.) (578935.) for electric cables.” 14441. July 28th, 1944. J. Lucas, Ltd., E. A. Watson and C. E. (578938.) Robinson.— “ Dynamo-electric machines.” British Thomson-Houston Co., Ltd., and 11223. June 12th, 1944. (578934.) T. H. Kinman.— “ Circuit arrangements for H. Newsam and Metropolitan-Vickers use at ultra high frequencies.” 51. January Electrical Co., Ltd.— “ Control systems for 1st, 1942. (578876.) power-driven apparatus.” 13417. October British Thomson-Houston Co., Ltd., and 17th, 1941. (579050.) H. W. C. Liddiard.— “ Protection of syn E. P. Newton (Baker & Co., Inc., and Ameri chronous electric motors.” 22325. Novem can Platinum Works).— “ Electrical contacts.” ber 13 th, 1944. (579026.) 12961. July 6th, 1944. (578936.) British Thomson-Houston Co., Ltd., and J. H. Runbaken.— “ Electrical testing instru K. J. R. Wilkinson.— “ System of charging ment.” 862. January 10th, 1945. (579065.) pulse shaping networks.” 15797. December Siemens Bros. & Co., Ltd., and D. P. Long.— 8th, 1941. (578875.) “ Automatic telephone systems.” 30. January British Thomson-Houston Co., Ltd., L. J. 1st, 1945. (578984.) Davies and H. K. Bourne.— “ Signalling Sperry Gyroscope Co., Inc.— “ Radio apparatus.” 16409. June 1st, 1938. (579034.) apparatus for measuring distance and direc “ Electric lamp signalling apparatus.” 30148. tion.” 3265/41. March 8th, 1940. (578953.) October 18th, 1938. (579038.) Standard Telephones & Cables, Ltd.— British Thomson-Houston Co., Ltd., H. K. “ Selection controlling circuits.” 6902/44. Bourne, L. J. Davies and H. R. Ruff.— “ Shutters May 6th, 1943. (579010.) “ Selection con for signalling and like lamps.” 35586. Decem trolling circuits.” 7236/44. May 6th, 1943. ber 6th, 1938. (579039.) (Addition to 579010.) (579011.) “ High fre Callender’s Cable & Construction Co., Ltd., quency oscillators.” 19668/43. October 8th, L. G. Brazier and D. T. Hollingsworth.— 1942. (579062.) “ Sealing ends for high voltage electric cables.” Standard Telephones & Cables, Ltd., and 15410. August 12th, 1944. (578902.) A. A. New.— “ Electric insulating materials.” Callender’s Cable & Construction Co., Ltd., Cognate applications 9206/42 and 10153/42. L. G. Brazier, R. M. Fairfield and D. T. July 3rd, 1942. (578915.) Hollingsworth.— “ Electric cables.” 14380. Standard Telephones & Cables, Ltd., C. W. July 27th, 1944. (579018.) Earp, I. R. J. James and R. F. Cleaver.— Eaton 'Manufacturing Co.— “ Thermo “ Radio direction finding equipments.” 2538. electric generators.” 5415/44. April 22nd, February 9th, 1940. (579042.) 1943. (578923.) Walsall Conduits, Ltd., and E. Gough.— Evershed & Vignoles, Ltd., and W. T. “ Electric plug-and-socket connectors.” Marchment.— “ Electrical control systems for 24780/45. February 21st, 1945. (Divided out aircraft.” 4925. March 16th, 1944. (578970.) of 575705.) (578949.) Ferranti, Ltd., and H. Easton.— “ Electric Wandsworth Electrical Manufacturing Co., rotary switches.” 24732. December 9th, 1944. Ltd., and T. Batchelor.— “ Electric plug connec (579028.) tors.” 15699. August 17th, 1944. (579019.) General Electric Co., Ltd., and A. Bloch.— Waymouth Gauges and Instruments, Ltd., “ Tracking arrangements for electrical circuits and H. Waymouth.— “ Electrical condensers of variable resonance.” 14899. October 23rd, for liquid volume indicators.” Cognate applica 1942. (578960.) tions 21867,43 and 2600/44. December 30th General Electric Co., Ltd., and D. C. Espley. 1943. (578886.) — “ Electrical apparatus adapted to operate M. P- Winther. ‘ Cooling of eddy-current at very high frequencies.” 10860. August apparatus. 13546/42. April 13th, 1942 26th, 1941. (578911.) (579053.) General Electric Co., Ltd., and E. Friedlandei. W. A. Woodeson, H. L. Thomas and Clarke — “ Generators of large pulses of electric Chapman & Co. Ltd.— “ Searchlights and lieht current.” 13317. July 12th, 1944. (578901.) beacons.’ 2987. December 13th 1930 General Electric Co., Ltd., and R. M. (579030.) J8' A ug u st 9, 1946 E l e c t r i c a l R e v ie w 241 CONTRACT INFORMATION Accepted Tenders and Prospective Electrical Work Middlesex. — Health Committee. Recom Contracts Open mended. Electrically heated food trolleys Where “ Contracts Open ” are advertised in our (£1,725).— Food Conveyors, Ltd. Official Notices ” section the date of issue St. Pancras.— Libraries Committee. Accepted. is given in parentheses. Sound film apparatus (£188).— B.T.H. Co. Adwick-le-Street.— August 23rd. Electricity Electricity Committee. Cables for three Department. Cables, switchgear and trans years.— Metropolitan Elec. Cable & Constrn. formers. (August 2nd.) Co.; Standard Telephones & Cables. Switch A ustralia.— October 17th. 15,000-kW steam board (£3,899).— A. Reyrolle & Co. Polyphase turbine and accessories. Spec. 412 (£22 first testing equipment: excluding N.P.L. test of copy, others 10s. 6d.). H. Baskerville, City instruments and current transformers, estimated Electric Light Co., Ltd., Boundary Street, at £93).— Foster Transformers & Switchgear. Brisbane. (Tenders). Salford.— Light, Heat and Power Committee. Accepted. Electricar vehicle (£329).— Crompton — August 16th. Borough Council. Bury. P a rk in so n . Electricity meters for one year. (August 2nd.) Transport Committee. Accepted. Electric D evizes.— August 19th. Rural District ally operated shutter gates at depot (£919).— Council. Electric lighting installation at Brow- Bolton Gate Co. fort House. P. R. Trapp, clerk, Maryport Southwark.— Electricity Committee. Recom C h am b ers. mended. Switchgear (£2,163) and erection Lerwick.— August 14 th. Town Council. (£151).— G.E.C. Electrical work for 82 houses to be erected at Todmorden.— Electricity Committee. Accepted. various sites. Alex. A. Foote, architect, 9, 600-kVA transformer (£500).— Yorkshire Elec York Place, Edinburgh, 1. tric Transformer Co. Manchester.— August 22nd. Electricity Depart Twickenham. — Housing Committee. Ac ment. Pipework, supports, valves, and four cepted. Electrical installation at Milton House motor driven pumps for Stuart Street power (£153).— R. Langston Jones & Co. station. Two 10,000-kVA transformers for Sale substation. (July 26th.) August 23rd. Public Health Department. Contracts in Prospect Electric pumps. (July 26th.) Particulars of new works and building schemes for August 14th. Town Council. Supply and the use of electrical installation contractors and erection of one 10-cwt passenger lift' at the traders. Publication in this section is no guarantee Central Library (deposit, £1 Is.). City architect, that electrical work is definitely included. Alleged T o w n H a ll. inaccuracies should be reported to the Editors. Morecambe and Heysham. — August 12th. Alnwick.— Houses (34), for the R.D.C.; Borough Council. Three 750-kVA transformers. J. G. Green & Son, builders, Warkworth. (A u gust 2nd.) Bangor.— Permanent houses (140), Coed Oldham.— August 31st. Electricity Depart Mawr housing estate; borough surveyor, ment. Cable, earthenware ducts and cable T o w n H all. covers. (August 2nd.) Bath.— Houses (42), at Whitchurch, near Portsmouth.— August 19th. City Council. Bristol for Bathavon R.D.C.; Grayson and Steel poles and fluorescent industrial type Goldsmith, Council’s architects, 7, Bridge Street. fittings. (See this issue.) B exley.— Three-storey flats (138), “ John Newton ” Court, High Street, Welling, and an Stoke Newington.—August 27th. Borough office block; G. A. Joy, borough engineer and Council. Conversion of radio apparatus on surveyor, Council Offices, Bexleyheath. consumers’ premises to d.c. (See this issue.) Bilston (Staffs.).— Permanent houses (66), Stoke-on-Trent.—August 15th. Town Stowlawn estate, section C ; borough architect, Council. Electric lamps for the six months 20, W ellin gto n R o ad . ending March 31st, 1947. City surveyor, Birkenhead.— Gymnasium and dining room; T o w n H all. B. Robinson, borough surveyor, Town Hall. W ilton.— August 31st. Town Council. Public Birmingham.— Houses (128), The Grove estate, lighting installation. Borough surveyor, Muni Harborne; H. J. Manzoni, engineer and cipal Offices, Fugglestone House. surveyor, Council House. Y eovil.— August 22nd. Borough Council. Houses (124), Chestnut estate (£134,817); Poles and electrical equipment in connection J. Simms, Sons & Cooke, Ltd., builders, Haydn with trunk road lighting. (July 26th.) Road, Sherwood, Nottingham. Boldon (Co. Durham).— H ou ses (14). B u rn Orders Placed ham Grove; E. S. Westcott, builder, Rudland Bradford — Electricity Committee. Accepted. Terrace, Sunderland. Air conditioning plant Valley power station Bolton.— Nursery School, Mere Hall; C. offices (£1 462).— Davidson & Co. 33-kV Herbert, borough surveyor, Town Hall. s w i t c h aear Dudley Hill and Four Lane Ends.— Bullingdon.— Houses (36), at Littlemore, Ewelme, Stanton St. John and Holton for M e t vfck 10,000-kVA transformer, Dudley „ _ C A Parsons. 7,500-kVA transformer, R.D.C.; H. W. Smith, Council’s architect, 29, Four Lane Ends.— English Electric. George Street, Oxford. 242 E l e c t r i c a l R e v ie w A u g u st 9, 1946 Bury.— Flats (16), and 34 bungalows, Huntley Sherborne (Dorset).— Houses (26), for U .D .C .; Mount estate: J. Chadwick, borough surveyor, P. O. Clark, deputy surveyor, Council Offices, Municipal Offices, 28, Bank Street. South Street. Coventry.— Houses (136), Monks Park estate South Shields.— Houses (50), Marsden Road ; (£139,220); city engineer. G. Bailey, Ltd., builders, King Street. Crook and Willlngton.— Houses (50), at Houses (56), for aged people, Quarry Lane; Willington for the U.D.C.; R. G. Finlay, borough engineer. builder, West Sunniside, Sunderland. Southwark.— Dwellings (71), St. Agnes Place Crosby (Lancs.).— Houses (24), Church Road area; borough engineer. housing site, Seaforth ; J. R. Fothergill, borough Stockton-on-Tees.— Additions to Egglescliffe engineer and surveyor, Town Hall, Waterloo, Foundry for Head, Wrightson & Co., Ltd. Liverpool, 22. (£160,000); direct labour. Dagenham .— Houses (44), Dagenham Road Sunderland.— Houses (372), Thorney C lose estate; borough engineer, Civic Centre. estate; borough engineer, Athenaeum Buildings, Deptford.— Prefabricated Council offices, New 27, Fawcett Street. Cross Road (£11,410); Greenaway & Son. Additions, Royal Infirmary; J. Huntley & Son, builders, Marion Street. Durham.— Houses (68), at Belmont; R.D.C. surveyor, Byland Lodge. Thorne.— Houses (40), Lands End Road housing site; Johnson & Crabtree, architects, G lasgow.— Houses (60), Cowden Street hous 20, Priory Place, Doncaster. ing scheme; Town Clerk’s Office. Thurrock.— Houses (40), and eight bungalows, Gosforth.— Permanent houses (100), in Broad Hall Road site, Aveley; G. F. Andrassy, way; Cussins (Contractors), Ltd., Jesmond, engineer and surveyor, Council Offices, White N e w ca stle . hall Lane, Grays. H ackney.— Primary school and small nursery Upholland (Lancs.).— Permanent houses (100), school, King’s Mead estate; L.C.C. architect. Hall Green estate; Gornall and Wainwright, Hexham-on-Tyne.— Electric lighting installa chartered architects, 8, Hardshaw Street, St. tions, Abbeygate House, for Ministry of Labour; H elen s. O. R. Porteous & Co. Winlaton (Co. Durham).— Houses (100), for H ull.— Offices, workshops and stores, Anlaby Blaydon U.D.C.; Stephen Easten, Ltd., West- Road and Wilberforce Street; Globe & Simpson. gate Grange, Newcastle-on-Tyne. Jarrow.— Municipal restaurant ; b o ro u g h en gin eer. . Ludlow.— Houses (24), at Cleobury M ortimer; Technical Information J. Brian Cooper, architect, 177, Corporation Need for Comprehensive Service Street, Birmingham. Manchester.— Flats (138), Ardwick (£180,382); rfkN E 'outcome of the recent Royal Society city architect. Empire Scientific Conference has been the Shops and flats (20), Baguley Hall estate preparation by Dr. B. J. A. Bard, secretary, (£88,350); city architect. Industrial Research Committee of the Federation Middleton.— School buildings, Durnford of British Industries, of a memorandum on the Street; W. Fearnley & Son (Salford), Ltd., dissemination of scientific and technical infor builders, Clarence Works, Eccles New Road. mation to industry in the United Kingdom and M offat.— Houses (24), for Town Council; the British Commonwealth. It deals with the town clerk. primary sources of new knowledge, the accumu Newcastle-on-Tyne.— Houses (24), Beaufront lation of working data within industrial Gardens; 50 houses, Harnham Gardens; establishments and the links (which form too 36 houses, Acomb Gardens; Dryden & Shaw, 6, M a rk e t Street. long a chain) between the supply, absorption Works extensions, Pressed Steel Co.,. Els- and application of fresh information. wick Road, Newcastle; C. Solomon, 187, No organization in Great Britain covers the Osborne Road. whole field and, moreover, the very numerous Northampton.— Houses (96), Delapre estate journals and other publications as well as the (£115,200); T. Wilson & Sons, Ltd., builders, compilation of abstracts and bibliographies, 65, Sheep Street. being for the most part not co-ordinated, Nottingham.— Partial completion, County Hall frequently overlap one another. There is much and offices (£40,000); county architect. room for improvement and rationalization in Oswestry (Salop).— Houses (102), Shrewsbury these respects, particularly in engineering Road site; S. Fox-Davies, architect, Memorial spheres. H all. Penrith.— Houses (80), Scaw housing site; Dr. Bard thinks there is scope for a compre R. E. Reay, builder, Wilson Row. hensive national technical information service Rochdale.— Branch library (£5,100) for to link (loosely) the various existing organiza libraries Committee; S. H. Morgan, borough tions, thus providing a recognized channel surveyor, Town Hall. through which the seeker after information can Rochford.— Houses (24), The Drive; A. N. speedily get into touch with whichever con Box, surveyor, Council Offices. stituent can best cater for his needs. Dr. Sevenoaks.— Houses (12), Bough Beech and Bard's ideas on how information should flow Four Elms; engineer and surveyor, Ingle is set out in diagrammatic form and fully wood, Oak Hill Road. explained in his memorandum. August 9, 1946 E l e c t r ic a l R e v ie w 57 FAMOUS HYDRO-ELECTRIC STATIONS. The Wheeler D am is the first o f the main river dams on the Tennessee River. It is nearly i \ miles long, 7 2 ft. high an d is o f gravity concrete structure. Altogether 7 0 0 ,0 0 0 barrels o f cement an d 7 0 0 ,5 0 0 cubic yards o f aggregate were used in its construction. This colossal dam has an output o f 348,060 h.p. MEASUREMENT LIMITED Electricity and Water Meters of Quality TERMINAL HOUSE, LOWER BELGRAVE STREET, LONDON, S.W.I cm 2 9 58 E l e c t r i c a l R e v ie w August 9, 1946 A new era of brightness in the home, office and factory! ; Brightness, cheerfulness, cleanliness, fresh air, health and good i are the order of the day, j Good lighting is a tonic- especially with Osram! Advt. of The General Electric Co. Ltd. Head Office : Magnet House, Kingsway, London, W .C .2 August 9, 1946 E l e c t r i c a l R e v ie w 59 c l a s s i f i e d advertisem ents ..... ADVERTISEMENTS for insertion in the following REPLIES TO advertisements published under a M andat 1StU£ are accePted up to First Post on Box Number if not to be delivered to any particular g £ * at Dorset House, Stamford Street, London, firm or individual should be accompanied by instruc THE CHARGE for advertisements in this section tions to this effect, addressed to the Manager of the r \ c c * (aPprox. 7 words) per insertion; ONLY ELECTRICAL REVIEW. Letters of applicants in such cases cannot be returned to them. The name ScMT,cL^ fi,D governm ent a n n o u n c e - • K ?xtt.CAN NOW BE DISPLAYED:— 30/- per of an advertiser using a Box Number will not be men. Where the advertisement includes a Box disclosed. All replies to Box Numbers should be 6r , 0011111:5 as six words and there is an addressed to the Box Number in the advertisement, ctT n lT»1'T>r^ar^e of 6d- ior postage of replies. c/o ELECTRICAL REVIEW, Dorset House, Stam SITUATIONS WANTED. — Three insertions ford Street, London, S.E.l. Cheques and Postal under this heading can be obtained for the price of Orders should be made payable to ELECTRICAL two if ordered and prepaid with the first insertion. REVIEW LTD. and crossed. Original testimonials should not be sent with applications for employment. OFFICIAL NOTICES, TENDERS, ETC. BOROUGH OF MAIDENHEAD ELECTRICITY DEPT. CITY OF PORTSMOUTH Appointment of Lady Demonstrator fTlENDERS are invited for the supply and delivery of the following: (1) 100 Steel Poles for public lighting and 50 Light Traction Type Steel Poles; (2) 12 Fluorescent A PPLICATIONS are invited for the above appointment Industrial Type Fittings, complete with Tubes. at a salary of £252 per annum, rising by annual Forms of tender may be obtained upon application to increments of £12 to £288 per annum, plus cost of living the Contracts and Supplies Section, City Treasurer’s Dept., bonus, at present £48 2s. The salary will be subject to adjustment to conform with any National Scale which may 48-51, Clarence Parade, Southsea, and tenders m ust be be introduced at a later date. delivered to the undersigned in the envelope provided not later than 10 a.m. on Monday, 19th August. 1946. The , Candidates must have had a good general education and envelope must not bear any name or mark indicating the .Diploma in Domestic Science and/or sender. the E.A.W. Electrical House-craft Diploma. They must V. BLANCHARD be competent to arrange and conduct lectures, demonstra City Council Chambers, Town Clerk. tions and exhibitions, and to advise consumers on the 1, Clarence Parade, Southsea. 2024 selection and use of electrical appliances of all types. The appointment will be subject to the provisions of METROPOLITAN BOROUGH OF STOKE NEWINGTON the Local Government Superannuation Act, 1937, and th t successful candidate will be required to pass a medical examination. fT^ENDERS are invited for the conversion to A.C. of D.C. wireless apparatus on consumers’ premises in the Applications, stating age, qualifications and full details Metropolitan Borough of Stoke Newington as the Council of experience, accompanied by copies of not more than proceeds with the change of its D.C. system to A.C. two recent testimonials, should be addressed to the under Tender forms and specification can be obtained from the signed not later than 24th August, 1946. Borough Electrical Engineer, Electricity Department. J. D. MARKLAND, Edwards Lane, Stoke Newington, N.16. Tenders must be Electricity Department, Borough Electrical delivered not later than Tuesday, 27th August, 1946, to Braywick Road. Engineer. the undersigned. Maidenhead. 1939 C. K EN T W RIGHT. Town Hall, Town Clerk. COUNTY BOROUGH OF BARNSLEY Stoke Newington Church St., N.16.______2019 ELECTRICITY DEPARTMENT SITUATIONS VACANT Mains Engineer COUNTY BOROUGH OF EASTBOURNE ELECTRICITY DEPARTMENT A PPLICATIONS are invited for the position of Mains Engineer, with charge of substations, in accordance Appointment of an Assistant Consumers’ Engineer with the National Joint Board Schedule of Salaries and Conditions, Grade 3, Class F, commencing £640 per annum. A PPLICATIONS are invited for the above position, with A car allowance on a mileage basis is paid. Corporate salary and conditions of employment in accordance membership of the Institution of Electrical Engineers, or with the N.J.B. Agreement, Class G, Grade 8b, at present equivalent, is considered a desirable qualification. £408 per annum. The appointment will be conditional upon the successful Applicants should have had a sound technical and prac applicant passing a medical examination for purposes of tical training in electrical engineering and be experienced the Local Government Superannuation Act, 1937. in the preparation of specifications and estimates for all Applications, stating age, details of education, training classes of wiring installations, and in the supervision of and experience, accompanied by copies of three testimonials, such work. Experience in the supervision of testing, should be delivered to the Borough Electrical Engineer inspecting and connecting consumers’ installations, includ and Manager. Queens Road, Barnsley, endorsed " Mains ing meter fixing, is necessary. A thorough knowledge of Engineer.” by Monday, 26th August, 1946. the Regulations of the Home Office, the Electricity Com A. E. GILFILLAN. missioners and the Institution of Electrical Engineers is Town Hall, Barnsley. Town Clerk. essential. Some experience of hiring schemes, maintenance 31st July, 1946. 2009 of domestic appliances, development of load and change over work is desirable. SWITCHBOARD ATTENDANTS Candidates must be at least Graduate Members of the Institution of Electrical Engineers, or possess equivalent qualifications. The appointment will be subject to the A PPLICATIONS are invited for the position of Switch- provisions of the Local Government Superannuation Act. board Attendant at the Nelson Corporation Power 1937, and the selected candidate will be required to pass Station. This station is a " selected ” station running in a medical examination. . parallel with the C.E.B. system. Preference will be given Forms of application may be obtained from the under to applicants who have had experience in parallel run signed. They should be completed in the candidate s own ning with the C.E.B. Applicants should have had a handwriting and returned in a plain sealed envelope, recognised training and experience in similar duties. endorsed "Assistant Consumers’ Engineer, so as to be Salary in accordance with National Joint Board Schedule. received not later than Monday. 2nd September. 1946. Class F. Apply, stating age. training, experience and N. BOYDELL. M.I.E.E.. A.M.I.Mech.E., present position, not later than Wednesday, 14th August. Electric House, Borough Electrical Engineer 1946, to T. Dawson Martin, A.M.I.E.E., Borough Elec Grove Ed., Eastbourne. and Manager trical Engineer and Manager, Electricity Works, Charles July. 1946. 1907 Street, Nelson, Lancs. 2014 60 E l e c t r i c a l R e v ie w August 9, 1946 CITY OF NOTTINGHAM CITY AND COUNTY OF THE CITY OF CHESTER Appointment of Chief Engineer and General Manager, Appointment of Electrical Engineer and Manager Electricity Undertaking PPLICATIONS are invited for the appointment of HE Nottingham City Council invite applications from A Engineer and Manager of the Council’s Electricity T qualified Electrical Engineers for the position of Chief Undertaking from persons experienced in the management Engineer and Manager of their Undertaking at a salary of and administration of such an undertaking. £2,250 per annum. The salary will be in accordance with the Agreement Applicants must be Members or Associate Members of made by the National Joint Committee of Local the Institution of Electrical Engineers. The person Authorities and Chief Electrical Engineers dated the 9th appointed will be responsible to the Electricity Committee July, 1941, but in pursuance of Clause 10 of this Agree and the City Council for the control and management of ment 85% of the salary will be paid in the first year and the Undertaking, and he will be required to devote his 92£% in the second year, the full salary being paid in whole tim e to the duties of the office, and will not be the third and subsequent years. On the present unit allowed to engage, either directly or indirectly, in private assessment of the undertaking this will be £1,323, £1,440 work of any kind. He will be expected to have, in addi and £1.557, respectively. tion to high technical qualifications, a considerable capacity Applicants must be corporate members of the Institution for ' business, and to show proof of an enterprising dis of Electrical Engineers. Recent experience in Electricity position. The appointment will be subject to the provisions Supply Undertakings is essential, and applicants must have of the Local Government Superannuation Act. 1937. and a thorough knowledge of design and operation of 33-kV, the person appointed will be required to pass a medical 6.6-kV .and L.T. underground and overhead Distribution examination. He must live within the City. Networks and Substations. Applicants must also be Applications, stating age. previous experience and thoroughly conversant with the management of Showrooms, present position, and accompanied by not more than three Hire and Hire Purchase. Assisted Wiring Schemes, and recent testimonials, and endorsed “ Chief Engineer and the general administration of an Electricity Department. General Manager. Electricity Department,” to be delivered The appointment will be terminable by three months’ to me not later than Saturday, the 14th day of September, notice in writing on either side, and will be subject to the 1946. Canvassing members of the Council, either directly Local Government Superannuation Act. 1937, and to a or indirectly, will be an absolute disqualification. satisfactory medical examination. J. E. RICHARDS. Applications, on forms to be obtained from the Town Guildhall, Nottingham. Town Clerk. Clerk, and accompanied by copies of three recent testi 23rd July. 1946. WOl monials, must be delivered to the undersigned not later than Monday, the 2nd September, 1946. Canvassing, TRINIDAD & TOBAGO ELECTRICITY COMMISSION, directly or indirectly, will disqualify, and any relationship TRINIDAD, B.W.I. to officers or members of the Council must be disclosed. G. B UR K IN SHAW, PPLICATIONS are invited for the post of Shift Town Hall. Town Clerk. A Engineer at the Commission’s Power Station in Port- Chester. of-Spain, which contains 15,000-kW of steam-driven and 27th July. 1946. ; *966 Diesel-driven generating plant. Applicants must be qualified mechanics, not more than 35 years of age, who BOROUGH OF HESTON & ISLEW0RTH have served an apprenticeship of at least four years in a ELECTRICITY DEPARTMENT recognised workshop and have had subsequent experience in the operation of steam plant, preferably with high Assistant Consumers’ Engineer pressure boilers and steam turbines. Applicants must be capable of taking charge of a Shift in the Commission’s PPLICATIONS are invited for the position of Assistant Power Station above-mentioned. A Consumers’ Engineer. The salary will be in accordance The commencing basic salary will be in the scale with the National Joint Board Schedule, Grade 9, Class G. $1,920.00 (£400) per annum, increasing by increments of at present £399 per annum. $ 120.00 (£25) per annum to $2,880.00 (£600) per annum The appointment is subject to the Local Government according to qualifications and experience, and having an Superannuation Act, 1937, and the selected candidate will efficiency bar at $2,400.00 (£500) per annum. In addi be required to pass a medical examination. Applicants tion to the basic salary there is a temporary cost of living must have had similar experience with municipal or supply bonus amounting to between $25.00 and $30.00 per month. companies and a thorough knowledge of the I.E.E. rules Applicants must suomit copies in the first instance of and regulations, including installation of all types of elec at least three testimonials. The selected candidate must trical apparatus and control of wiring and consumers’ pass a medical examination by the Commission’s Medical maintenance staff. Adviser for fitness to be admitted to the Commission’s Applications for the position must be made on a form service and must enter into a three-years’ contract with to be obtained from the Borough Electrical Engineer and the Commission. Manager. 11, Staines Road, Hounslow, and addressed to Applications must reach the undersigned not later than the undersigned endorsed "Assistant Consumers’ Engineer.” 12 noon on the 2nd September, 1946, and must be en accompanied by not more than three recent testimonials, dorsed on the upper left-hand corner of the envelope to be received not later than 12 noon, 31st August, 1946. ” Shift Engineer, Trinidad.”—Preece, Cardew & Rider. 8 , Queen Anne's Gate. Westminster. S.W.l. , 1974 HAROLD SWANN. Council House, Town Clerk. COUNTY BOROUGH OF HUDDERSFIELD Treaty Road, Hounslow. ’______1999 ELECTRICITY DEPARTMENT. CITY OF PORTSMOUTH ELECTRICITY SERVICE PPLICATIONS are invited for the position of Mains A (Substations) Assistant on the staff of the Mains PPLICATIONS are invited for the following positions: Department in accordance with the National Joint A (a) CIVIL ENGINEERING ASSISTANT at a salary Board Schedule. in accordance with Grade 8 . Class J, of the N.J.B1. Schedule, Candidates must have had experience in the design, at present £521 rising to £544 per annum in the 4th year. erection, maintenance and operation of E.H.T. and L.T. Applicants must have had a sound technical training and O/H and U/G cables and static substations and protec experience in the preparation of drawings, specifications tive systems, and be Graduates or Corporate Members of and bills of quantities, etc., and preferably hold qualifica the Institution of Electrical Engineers. tions admitting to membership of one of the professional The appointment will be subject to the provisions of Institutions. the Local Government Sup. Act, 1937, and the successful (b) ASSISTANT SHIFT ENGINEER at a salary in candidate will be required to pass a medical examination. accordance with Grade 8b. Class J. of the N.J.B. Schedule, The present grade is 8B/1, Class G, £408-£422. (It is at present £456 per annum. Applicants should be in anticipated the undertaking will be raised shortly to possession of technical qualifications admitting to corporate Class if -i. membership of a recognised professional Institution, have Applications endorsed " Mains (Substation) Assistant.” haj previous experience in a large modern generating should give age. education, details of training and ex station, and preferably have had manufacturing works perience and technical qualifications, and be accompanied experience. by copies of recent testimonials, and should be addressed Forms of application may be obtained from the Engineer to the undersigned not later than Monday. August 19th. and Manager. The latest date for the return of applications is the 27th September. 1946. Canvassing, either directly 1946' F. A. EELIS, M.I.Mech.E., M.I.E.E., M.Inst.F., or indirectly, will be a disqualification. Market Street. Borough Electrical Engineer R. H. COATES. Huddersfield. an(* Manager. Ill, High St., Portsmouth. Engineer and Manager. 194» July. 1946. 1392 August 9, 1946 E l e c t r i c a l R e v ie w 61 NORTH-WEST MIDLANDS JOINT ELECTRICITY ST. AUSTELL & DISTRICT ELECTRIC LIGHTING AUTHORITY & POWER CO. LTD. Mealord Generating Station Appointment ot Chief Engineer and Manager are invited for the following Technical APPLICATIONS are invited from suitably qualified TOh;n§^P+?PK>0 merits-at the Meaford Generating Station, -*-*• persons for this appointment. The salary will be on four^ 30.000-kWan m n Î t w >T Turbo-Alternators, niS ; 0f,ed early “ six1947 240,000 “ d lbs. contain per a similar basis to the scale set out in the Agreement, dated 9th July, 1941, made between the National Joint Council 3,000,000 galls. perful‘ hour Cooling Water Towers Tllbe Boners and two for Local Authorities and Chief Engineers. The supply of electricity dealt with by the company is p rim a rily taken (a) 0 n?oS orks Superintendent. Class J . Grade 3. £785- £821 per annum in bulk, and the “ unit assessment ’’ based on the year (b) One Assistant Works Superintendent, Class J. ended 31st December. 1945, is 10 millions. The m airim n m Grade 5, £651-£682 per annum. salary under the above Agreement would be £914 per (c) One Mechanical Maintenance Engineer, Class J annum, and the commencing salary will be between 85% Grade 6. £616-£644 per annum. of the full salary and that m a x im u m , according to the (d) One Electrical Maintenance Engineer, Class J, qualifications and experience of the successful candidate. A cost-of-living allowance will also be paid, together with Grade 7, £563-£589 per annum. a car allowance. ' (e) Four Shift Charge Engineers. Class J , Grade 7. £563-£589 per annum. Applicants should be corporate members of the Institu (f) Four Shift Efficiency Engineers, Class J, Grade 8. tion of Electrical Engineers and be not more than 45 years £521-£544 per annum. age' . Becent experience in electricity supply under The conditions of service and salary will be in accordance takings is essential, and applicants must have a thorough with the N.J.B. Schedule for the Electricity Supply In knowledge of design and operation of E.H.T. and L.T. dustry. Application forms, together with conditions of distribution networks and substations. Applicants must em ploient and list of duties, may be obtained from the also be thoroughly conversant with the management of undersigned, and must be returned not later than Monday. showrooms, hire and hire purchase, contracting depart August 26th, 1946. ment and the general administration of an electricity undertaking. The successful applicant will be required to F. FAVELL. M.I.E.E.. M.I.Mech.K. enter into a Service Agreement and to join the Company’s York Chambers, Chief Engineer and Manager. Contributory Pension Scheme. Kingsway, Stoke-on-Trent. Applications, stating age, experience and qualifications, 24th July. 1946.______1923 together with not more than three recent testimonials, BOROUGH OF SWINDON ELECTRICITY DEPT. should be addressed to the Company’s London Office at Balfour House, 119/125. Finsbury Pavement, London, Appointment of Stores Supervisor E.C.2, in an envelope endorsed “ Chief Engineer and Manager,” not later than 31st August. 1946. Canvassing. A PPLICATTONS are invited for the appointment of either directly or indirectly, will be a disqualification. 2018 Stores Supervisor in the above Department, at a COUNTY BOROUGH OF CROYDON salary in accordance with Grade I of the Miscellaneous ELECTRICITY DEPARTMENT Division of the National Scales (£255 to £300), plus such cost of living bonus as may from time to time be paid by the Corporation (at present £59 16s. per annum). Deputy Chief Engineer and Manager Preference will be given to applicants who have had experience in storekeeping, timekeeping, clerical work and A PPLICATTONS are invited for this appointment from supervision of staff in the stores department of an elec men not over 45 years of age who are Corporate tricity supply undertaking. The appointment, terminable Members of the Institution of Electrical Engineers experi by one month’s notice on either side, is subject to the enced in the management and administration of a large provisions of the Local Government Superannuation Act. electricity undertaking. 1937, and the successful applicant will be required to pass Salary £1.350 per annum, plus bonus (at present £59 16s. a medical examination. per annum). Subject to his executing an agreement with Applications, stating age, qualifications and experience, the Corporation for certain work connected with the pro with particulars of past and present employment, and posed new generating station, the person appointed will accompanied by copies of three recent testimonials, must also receive a payment—not subject to superannuation— be delivered to me not later than Saturday , 24th August. of approximately £400 per annum until December, 1949. 1946. in envelopes endorsed “ Stores Supervisor, Electricity Other payments may be made after that date as further Department.’’ Canvassing in any form will be deemed a sections of the new station are p ut in hand. disqualification and applicants must state whether to their Terms and conditions of appointment may be obtained knowledge they are related to any member of the Council from the Chief Engineer and General Manager, Electric or to any Senior Officer of th e Corporation. House. Wellesley Road, Croydon, and should be returned D. MURRAY JOHN. to him completed by Tuesday. September 10th, 1946. Civic Offices. Swindon. Town Clerk. Canvassing will disqualify. 23rd July. 1946. 1905 E. TABERNER, Town Hall, Croydon. Town Clerk. BOROUGH OF MAIDENHEAD ELECTRICTY DEPT. July, 1946.______2023 Appointment of Assistant Mains Engineer CROWN AGENTS FOR THE COLONIES A PPLICATIONS are invited for the above appointment Colonial Government Appointments at a salary in accordance with Grade 7, Class E. of the National Joint Board Schedule, at present £449 per A PPLICATIONS from qualified candidates are invited annnm for 2 years, £459 per annum for 3rd and 4th years for the following post: Meter Superintendent required and £469 per annnm after the 4th year. by the Nigerian Government Electricity Undertakings for Candidates must have passed the Graduateship examina one to u r of 18-24 months, with prospect of permanency. tion of the I.E.E. or hold equivalent qualification, and Salary £630 rising to £720. On salary of £630 there is had practical experience in the construction, maintenance a local allowance of £24 and for married men a separation and operation of overhead and underground 3-phase E.H.T. allowance of between £60 and £180 a year according to transmission systems; L.T. distribution, transformers, number of dependants. Free passages and quarters. Can switchgear and substations. Experience in rectifier sub didates. not over 35 years of age, must be fully conversant stations. and the change-over of supply networks from with the fixing, testing and maintenance of all types of D.C to A.C. would be an advantage. A.C. and D.C. (single and polyphase) meters, and with The appointment will be subject to the provisions of the protective systems and the testing and maintenance of Local Government Superannuation Act. 1937, and the operative and protective gear. They should also have had successful candidate will be required to pass a medical good general administrative experience. examination. . . . , . ... Apply at once by letter, stating age, whether married Applications, stating age. training and experience, with or single, and full particulars of qualifications and experi darii and accompanied by copies of not more than three ence. to the Crown Agents for the Colonies, 4, Millbank. recent testimonials should be addressed to the under- London. S.W .l. quoting M /N /16840. 2011 signed not later than 34th Angust.m f i . ^ ^ A PMATURE Winders and Improvers required, A.C. Electricity Department, Borough Electrical and D.C., top rates, good working conditions.— Braywick Road. Engineer. Electrical Power Repairs (Gillingham) Ltd., St rover Maidenhead. 1 9 3 8 Street. Gillingham. K ent. 9365 62 E l e c t r i c a l R e v ie w A ugust 9, 1946 N opportunity for an Electrical Engineer conversant f^lIVIL Service Commission. Applications are invitejj A with machinery installation, house and factory wiring, ^ posts at the Military College of Science, Shrivennam, estimating and control of work. Partnership offered to near Swindon, Wilts, of permanent and temporary prin suitable applicant. Must be a willing worker. Write, cipal Lecturers, Senior Lecturers and Lecturers. Vacancies stating age, experience and salary required.—Box 9373. in one or more of these grades exist in the following sun- jects: Ballistics, Chemistry, Applied Chemistry, Electrical c/o The Electrical Review. „ . Engineering, Heat Engines, Instruments, Machines, PPLICATIONS are invited for the position of Mains Materials and Structures, Mathematics, Mechanics, Metal A Foreman. Applicants must have experience of laying lurgy, Physics, Radar and Telecommunications. Applicants and jointing E.H.T. and L.T. cables, maintenance of dis must have a university degree in an appropriate scientific tribution systems and control of labour. Wages and con subject, with first or second class honours, or an equivalent ditions of employment will be in accordance with the qualification. Experience in research or design as applied Council’s grading scheme. Rate of wages at present to military needs would be an advantage. The inclusive £7 10s. per week, rising by five equal annual increments scales of salary are (Principal Lecturer) £840-£1.125, to £8 10s. per week. The successful applicant will be (Senior Lecturer) £610-£800, (Lecturer) £333-£560. Full subject to the provisions of the Local Government Super particulars of the posts, together with a statement of the annuation Act, 1937. Applications to be made in writing, conditions of service and the intentions of the War Office stating age, training and experience, together with copies regarding the Military College of Science, and a form of of not more than three recent testimonials, to the Borough application, may be obtained from the Secretary, Civil Electrical Engineer, 1, West Street, Bromley, Kent, and Service Commission, Burlington Gardens, London, W.l, to be received by him not later than Monday, August quoting No. 1575. Application forms must be returned 26th, 1946. . 2027 to him by 26th August, 1946. . 1988 RMATURE Winders required for steelworks m North IVIL Service Commission. Applications are mvited for A Lincolnshire, must be experienced in repairing and C the post of Bashforth Professor of Mathematical rewinding from 5-h.p. to 150-h.p. A.C. and D.C. machines. Physics at the Military College of Science. The post will Reply, with full particulars, to—Box 2026, c/o The Elec- be filled by competitive interview of suitable applicants at the Civil Service Commission on 16th September, 1946. RMATURE Winders wanted, experienced on A.C. and The College is at Shrivenham, near Swindon. Wilts. If, A D.C. repair work.—The Midland Electric Installation owing to the housing shortage, accommodation is unavail Co. Ltd., Cyprus Works, Upper Villiers Street, Wolver able, War Department quarters may be allotted at a fair ham pton. . rent until such time as other accommodation becomes SSISTANT Chief Engineer required for large iron and available. Applicants should be mathematicians of high A steel works in the North of England. Applicants standing with a good knowledge of Physics; the professor should have had extensive experience of mechanical and will be required to exercise general supervision over the electrical plant installation and maintenance, and prefer three branches, Mathematics, Physics and Gunnery and ably some design experience as applicable to iron and the theory of weapons. The salary offered is £1,500 X steel works practice. The duties will involve appreciable £50 to £1,700. Under present arrangements an additional responsibility, for which an adequate salary will be paid. payment of £120 attaches to the minimum of the scale. Please reply indicating previous experience, technical In the case of higher rates this addition is reduced by training and present salary to—Box 1786, c/o The Elec 12s. for each complete £1 by which the salary exceeds trical Review. £1,500. Full particulars of the post, together with a state SSISTANT Superintendent required for domestic ment of the conditions of service and the intentions of the A appliance repair shops at Burford, near Dorking. W ar Office regarding th e M ilitary College of Science, and a Commencing salary £8 per week inclusive. Applicants form of application, may be obtained from the Secretary, should have had workshop experience and have passed Civil Service Commission, Burlington Gardens, W.l, either Higher National or I.E.E. Graduate examinations quoting No. 1517. The envelope should be marked “M.C.S.” or equivalent standard. Full conditions of service and in the top left-hand corner. Application forms must be duties can be obtained on applicatiipn to^Area Officer returned to him by Monday, 19th August, 1946. 2004 (Consumers), London & Home Counties Joint Electricity /COMPETENT Shorthand-Typist required for electrical Authority. Burford. Dorking. Surrey. 9369 engineers’ office, Victoria St., S.W.l. Salary approx. RITISH Engine Boiler & Electrical Insurance Co. Ltd., £5; 5-day week. Apply, with full details, to—Box 2005, B 24, Fennel Street, Manchester, 4. The company .has c/o The Electrical Review. a number of vacancies for Electrical Plant Inspectors. COMMERCIAL Correspondent and Technical Estimator Permanent positions carrying progressive salary scale and required to take charge of office of factory com non-contributory pension. Candidates, age 30/35, with mencing manufacture of small motors in South Wales. apprenticeship and experience in the manufacture, repair Excellent opening for young energetic man. Previous and industrial use of electrical machinery and technical experience essential. Give full details of training and education at least Higher National Certificate standard, salary required.—Box 1873, c/o The Electrical Review. are invited to apply in own handwriting, stating age, qualifications and experience. 1979 CONSULTING engineers in the London area require an v-' Engineer with university degree capable of assisting in ABLE Sales Engineer Representatives required for the preparation of reports to clients on large-scale electric C North-West, Midlands, Yorkshire and North-East power generation and supply. Experience of the technical areas, to develop sales of rubber insulated cables, manu and economic aspects of steam power generation is neces factured by well-established independent rubber cable sary, but some electrical experience is desirable. Ability manufacturing company in North-West. Applicants must to prepare clear and logical drafts is essential. Salary have an intimate knowledge of rubber cable technique and £600/£900 p.a. according to qualifications. Applications in preferably a good connection with industrial, colliery and writing, stating age and experience, to—Merz & McLellan, municipal undertakings. Applications will be treated in strict confidence and should state age and salary required Milburn, Esher, Surrey. 2000 to—Box 1912, c/o The Electrical Review. CONTRACTORS require Assistant Engineer for overhead /CAMERAMAN. Large engineering firm in the Midlands ^ and underground electrification to eventually take ^ require experienced Industrial Photographer. Must control; knowledge of surveying desirable but not essen be capable of taking first-class photographs in the Com tial; good prospects. State age, salary required and ex pany’s works, and prepared to travel to different parts of perience.—Box 1986, c/o The Electrical Review. the country to take photographs of the Company’s plants EVELOPMENT Engineer required for electrical and and apparatus installed in all types of industrial under D mechanical engineering company in London area. takings. Experience of press work a considerable advan Good practical knowledge of F.H.P. motor production and tage. Full time services only considered. Write stating development with suitable technical education and quali age, full particulars of experience and salary expected to— fications essential. Post requires a man with initiative Box 1969. c/o The Electrical Review. and ability to pursue lines of development with energy HEMIST. A firm of electric lamp manufacturers require and determination. Write, stating age, qualifications and C for their factory a man aged 20 to 30 who possesses salary required.—Box 1853, c/o The Electrical Review. chemical training up to about B'.Sc. standard, and prefer OMESTIC appliance manufacturers require Commission ably some industrial experience. In addition to chemical D Representatives for the following areas: South Coast, work the selected applicant would be required to carry out East Coast, Northern Counties, South Wales, South-West other technical duties for which he would be trained. Give England, Midlands. .Full details to—Box 1925, c/o The full particulars by letter to—Cryselco Limited, Kempston Electrical Review. Works, Bedford. 1884 RAUGHTSMEN (Electrical and Jig and Tool): One i^lHIEF Electrical Engineer required by switchgear D Senior Electrical Draughtsman accustomed to design specialists in North-West. Must be familiar with of motors up to 5 h.p. and one Jig and Tool Designer- H.V. insulation practice. Progressive position for young Draughtsman. Salaries according to qualifications and engineer prepared to accept responsibility. Reply, stating experience, progressive posts. Full particulars to—Per age, experience, salary required, and include testimonials. sonnel Manager. Small Electric Motors Ltd., Churchflelds —Box 1962, c/o The Electrical Review. Road. Beckenham, Kent. 1993 August 9, 1946 E l e c t r i c a l R e v ie w 63 D*ESIGNER-Draughtsman required for work on test UNIOR Draughtsman for electrical and mechanical Jv?5X5i measuring instruments. Write, giving J engineers. North London. Expanding concern offering SSiiiSfwi i°i exPerience and salary required, to— good opportunity to young man keen to train on. State tti1 a t instrum ents L td., Slough, Bucks. 9324 age, experience and any technical qualifications.—Box 14 lviiiOiKiuAL Engineer required to take charge of test 1904, c /o The Electrical Review. room. Must have previous experience in testing all ABORATORY Assistant wanted. Inter B.Sc. standard, types of accurate moving coil instruments. Degree man L if possible with experience on small electrical and preferred, factory situated in Home Counties. State thermal mechanisms. S.W. London area.—Box 2029, c/o age, experience and salary required—Box 9311, c/o The Electrical Review. The Electrical Review. T^LECTRICAL Fitters, thoroughly experienced A.C./D.C. ARGE electrical firm in London area requires two motor repairs, 1 to 50 h.p., and attendance on break L experienced Radio Set Designers; 5 years’ experience down jobs. Also Chargehand for similar work and bench essential.—Box 2007, c/o The Electrical Review. hand, experienced manufacture and assembly motor IFT and Crane Inspectors. Applications invited from starters. North London district. Good wages and work L engineers, age 30/35, with sound training in lift or ing conditions. Give details experience to—Box 1989, c/o crane construction and having electrical and mechanical The Electrical Review. experience. Progressive salary scale and non-contributory T^LECTRICAL Research Engineer required by company pension. Candidates should apply in own handwriting, engaged on H.V. switchgear production. To be stating age, qualifications and experience, to — British capable of dealing with insulation problems relative to Engine Boiler & Electrical Insurance Co. Ltd., 24, Fennel air insulated and compound filled switchgear. up to Street, Manchester, 4. 1980 132 kV. References together with details of experience, LUMBER-Jointers and Overhead Linesmen required salary required and age, are required.—Box 1963, c/o The P in Berks and Wilts. Permanent employment. Wages Electrical Review. and working conditions in accordance with Joint Indus LECTRICAL Wiremen required for Brighton/Hove trial Council schedules. Apply—Wessex Electricity Co., E district. Apply—Troughton & Young Ltd., 6, Basil Oxford Road, Newbury. 1888 Street. Knightsbridge. S.W.3. 1806 RODUCTION Engineer for works in South Wales LECTRICIAN (Working) for electrical maintenance P manufacturing small electric motors. Knowledge of E contracts on all classes of A.C. and D.C. industrial planning and costing with experience of similar work motor installations in London area. Only men with previous essential. Full details of previous experience, salary experience on automatic control gear, lifts and similar required and when free to—Box 1872, c/o The Electrical equipment need apply. Permanency and good wages and Review. conditions to selected applicant. Write, stating age and URCHASING Manager required for important manu experience, to—Box 1987, c/o The Electrical Review. P facturing concern in Greater London area. Must be LECTRICIANS, experienced in first-class electrical fully experienced in controlling purchasing in light elec E installation work. District rate. Applications, trical engineering, radio, domestic appliances, etc. Know stating experience, etc., to — J. E. Goundry, Electric ledge of supplies and market prices, modern buying House, Reigate. 1998 methods and routine essential. Good salary and prospects. LECTRICIANS, good, used first-class work, installa Write, stating age, experience and salary required, to— E tions, jobbing, maintenance.—Oakes & Foster, 29, B'ox 1995, c /o The Electrical Review. St. John's Wood High St., N.W.8. Pri. 1786. 9372 ADIO Design Engineer required for domestic receivers. NGINEERS and Draughtsmen are invited to apply to R Applicants preferred with degree in engineering, E a large electrical engineering firm in the Midlands experience in home and export design and knowledge of which has vacancies in the switchgear department for production economics. Salary according to qualifications Technical Sales, Contract, Costing and Design Engineers; and experience. North London.—Box 1936, c /o The also experienced Technical Engineers capable of handling Electrical Review. large projects for generation, transmission and distribution. ADIO Engineer. Large radio firm in London area Vacancies also exist for Draughtsmen for circuit diagram R requires an engineer to act as deputy to the head and general work.—Box 69, c/o The Electrical Review. of its radio design section. The engineer concerned should STIMATING and Costing Clerk required for electrical have theoretical and practical experience of radio set E contracting. Apply in writing, stating previous design, preferably for the Services.—Box 2028, c/o The experience and salary required to—Giles (Electrical Electrical Review. Engineers) Ltd., 11, Victoria Colonnade, Southampton EPRESENTATIVES required to introduce new exclu row, London. W .C .l. 1968 R sive lines to corporations, wholesalers and retailers. STIMATING Electrical Engineer required by electrical Please state territory covered. Commission basis.—B'ox E contractor. Must be able to prepare own lighting and 2013, c/o The Electrical Review. power schemes and specifications. Responsible progressive EQUIRED, two fully experienced Supervising Engi position. Particulars and salary required to — Frank R neers and Estimators, fully conversant with estimating Burton. 266, Corporation Street, Birmingham, 4. 9329 and supervising internal wiring and power contracts, cables T?XPERIENCED Draughtsmen are required by large and switchgear. Applications together with copies of electrical firm in Midlands. Must be familiar with references and details of experience. Only first-class men mechanical design and construction of medium and large need apply.—T. Clarke & Co. L td., 129 Sloane Street, A.C. and D.C. machines. Reply with full particulars to— S.W .l. 9354 Box 289, 8. Serle Street, London, W.C.2. 1981 QOUTH Wales Switchgear Ltd.. Treforest, Glam., have "¡EXPERIENCED Fitter and Erector of electrical coil a vacancy for a Design Engineer for 33,000-volt winding machinery. Apply—Universal Winding Co., switchgear. Apply in writing, giving age, experience and Saville Street, Oxford Road, Winchester. 1924 salary required. 1863 "C^IRST-class Designer-Draughtsmen, interested in an opportunity to work in close touch with an up-to-date STOREKEEPER/Clerks, preferably familiar with small electrical and mechanical research dept, engaged on a wide ^ electrical or radio parts, raw material and small tools. range of interesting work, are required by—The English Good wages, canteen facilities, etc.—Taylor Electrical Electric Co. Ltd., Queens House. Kingsway. W.C.2. 1920 Instruments Ltd., 419, Montrose Avenue, Slough. 1789 7F1ECHNICAL and Sales Engineer. Experienced industrial OREMAN Armature Winder and two extra Winders.— J- electric motor sales and service, particularly repairs F Box 1992, c /o The Electrical Review. and rewinds, fractional to 50 h.p. To take charge, after OREMAN wanted to take charge of small factory, few months in London, of West England new branch of F Kingston area, producing light electrical and mechani well-known firm. State salary required. The appointment cal units Should have knowledge of press tools, all types presents a fine opportunity to the right m an.—Box 1887, of machining and be capable of controlling mixed staff. c / o The Electrical Review. Good prospects for experienced man Write, giving full URBINE Driver, experienced with Brush-Ljungstrom particulars and salary required, to—Box 1950, c/o The T turbines, required for shift duties in municipal power Electrical Review. , . station. Wages, D.J.I.C. rate, at present £6 6s. Id. for r 'i IRLS for clean light assembly work. Full pay during 48-hour week. Applications, in writing, to—A. W. Bar \JT training bonus after. Good conditions, welfare, ham, Chief Engineer and General Manager, Electricity nnntppn etc free lunches if under 17 years of age.— House, The Parade, Watford, Herts. 1990 TavW FlPrtrical lnstruments Ltd.. 419, Montrose Avenue. ANTED, assistance of Scientific Electrician to develop Drouth or 148a High Street. Slough. 1791 W incalculable invention.—Box 1926, c /o The Electrical t t t t a t t NG and Air Conditioning Controls. Young Tech- Review. H nician required _with degree^or^uivatenL .pretoab^ •4.U oSSpni’p in space and process automatic -control. TTLTOMEN or Girls with experience of radio wiring, good experit ▼ * wages and bonus. Clean light work, welfare, can wss^ »asiderable jaissftSsK ? gaisrSd as: teen. etc., facilities for free medical advice.—Taylor Elec in writing. * Watford Electric &" Mfg. ‘Co. L td.. Whippen- trical Instruments Ltd.. 419, Montrose Avenue, Slough, or 148a, High Street, Slough. 1790 dXs v M ir a Herts- c r - ...... -1959 64 E l e c t r i c a l R e v ie w August 9, 1946 rpH E Hong Kong Electric Co. Ltd. Applications are A DVERTISER (30) desires appointment with electrical -1- invited for the position of Shift Engineer in the above engineering organization as an Engineering Repre company's power station at Hong Kong. Applicants should sentative or Manager. Familiar with Southern Counties. have had a good technical education and practical experi Fourteen years, manufacture, estimates, contracts, labour ence in a modern generating station (6.6 kV). should be management, in electrical engineering. Practical, technical 25-30 years of age and preferably unmarried. First engage and managerial experience. Accustomed to using initiative. ment would be for three years with prospect of permanent Free one month notice.—Box 9342, c/o The Electrical employment at increased rates of pay after the third year. Review. Salary for first year, 400 Hong Kong dollars per mensem, le c tric a l Engr., m.a., a.m .i.e.e., single, b.t.h. with exchange compensation when dollar is valued at less E apprentice, 7 yrs. power co., 6 yrs. H.T. and L.T. than two shillings. Free quarters or allowance in lieu. transmission, 2 yrs. ordering and estimating elec. equip Provident fund. Free passage out and home with half ment, offers services.—Box 9360, c/o The Electrical Review. salary during outward voyage; 8 months’ leave with X^LECI’RICAL Engineer. University honours graduate, passages and full pay after 5 years’ service. The selected ex-Serviceman, age 33, seeks position, with preference applicant will be required to pass a medical examination. for development and research work. Box 9295, c/o The Applicants should apply in writing to the London Repre Electrical Review. sentative, The Hong Kong Electric Co. L td., 122, Leaden- T^LECTRICAL Engineer, age 48, D.C. armature winder, hall Street, London, E.C.3, and should state their age; if repairs or rewinds, full knowledge of A.C. and D.C. married, and if so how many children; training and ex maintenance and installation, would consider partnership, perience, and send copies of testimonials. 1900 London area.—Box 9345, c/o The Electrical Review. ELL-known electrical manufacturers opening new T^LECTRICAL Engineer (22), having Ord. and Higher W works in South Wales for manufacture of small National Certificates and served indentured appren motors require young, capable and energetic General ticeship, seeks progressive post with lighting contractors. Manager to take control. Must have good commercial —Box 9323, c/o The Electrical Review. and engineering knowledge of the industry. State previous LEC. Foreman, 20 yrs'. exp., large installations and experience and salary required.—Box 1871, c/o The E maintenance, requires progressive position, London Electrical Review. area.—Box 9348, c/o The Electrical Review. per armum- Joint Manager required for LECTRICIAN (30) with diesel exp., 7 yrs. charge elec transformer department. Must be capable E trician, Merchant Navy, seeks maintenance post. and with organising ability.—Box 1945, c/o The Electrical Southern England.—Box 9335, c/o The Electrical Review. Review. ■p'LECTRONIC Engineer (25) desires progressive position, preferably in Yorkshire. Graduate I.E.E., National APPOINTMENTS FILLED Ordinary Diploma, Higher National Certificate, City and Dissatisfaction having been so often expressed that un Guilds Finals; 6 years’ experience in design and main successful applicants are left in ignorance of the fact that tenance of thermionic equipment for H.F. and L.F. the position applied for has been filled, may we suggest measurements.—Box 9343, c/o The Electrical Review. that Advertisers notify us to that effect when they have NGINEERING Executive, A.M.I.E.E., Int.A.M.I.P.E. arrived at a decision? We will then insert a notice free E (31), desires position as Works Manager in small or of charge under this heading. medium size progressive electrical company. Good tech A . J. Evans & Son—Storekeeper; Borough of Bridport— nical and administrative experience.—Box 9353, c/o The , Commercial Assistant; Borough of Nuneaton—Mains Electrical Review. S u p t.; Box 1735— Two Engineers; City of N ottingham — X-Electrical Contractor, life experience, practical, seeks Chemist and Asstnt. Chemist, Senior and Junior Relief E responsible post, good knowledge men and materials, Shift Engrs. and Asstnt. Control Engrs.; Corporation of keen (56). Please give general requirem ents.—Box 9303. Kendal—Meter Tester and Repairer; Scottish Southern c/o The Electrical Review. Electric Supply Co. Ltd.—Senior Assistant. All applicants T^X-Major (40). Royal Engineers 4 years, is anxious to are thanked. obtain suitable post away from London (south of); 20 years’ civil experience in electrical and mechanical engi SITUATIONS WANTED neering, unimpeachable references. Desires post as Chief A capable Electrical Engineer with exceptionally wide Engineer in large factory or group of factories or work experience covering all phases of A.C. and D.C. motor shops. Experienced all types electrical power plant and construction, application and installation, estimating and distribution, steam and diesel, internal lighting and power labour control, seeks situation where originality and installations. Installation of new mechanical plant and organizing ability have full scope.—Box 9356, c/o The machinery, maintenance and repairs. Salary immaterial. Electrical Review. Job and surroundings more essential.—Box 9341, c/o The A position is required by an Executive Engineer, elect. / Electrical Review. mech., 28 years’ exp., age 43. Fitting, machining, X^X-R.E.M.E. officer (38) requires Technical, Adminis- assembly, etc., administrative, manuf., repairs, dynamos, trative or Commercial post. Experienced production switchgear, radio compts., precision work, engine manuf. and development radio, precision electrical instruments, —Box 9331, c/o The Electrical Review. etc.—Box 9362, c/o The Electrical Review. BOUT Production. The Sales and Commercial field T^X-W.O. (Elect.), R.E.M.E., desires position Maint. A of the Electrical Industry are starved for want of Eng. Exp. A.C., D.C. gens, rects., power plant, supplies. Those who are interested in production are est. and contracting, or Lecturer and Instructor. E.C.A. invited to communicate with the advertiser who is an member pre-war. Home or abroad.—Box 9344, c/o The Electrical Engineer and production expert. Experience Electrical Review. covers the production of all manner of Electrical equip T^URTHER experience sought by Electrical Engineer, ment from a lampholder to a Turbo-Alternator, from the X keen worker, Inter-B.Sc., Nat. Certificate, proceeding raw material stage to the final product. Methods are not to Higher Nat. Two years laboratory testing exp. Good harsh and results are guaranteed without disturbances or references. Testing preferred but not essential.—Phone increased costs. Remuneration by salary (to be agreed) Syd. 4576 or write, 71, Tannsfeld Road, S.E.26 9366 and production bonus.—Box 9317, c/o The Electrical Ô_RAD.I.E.E. (26), ex-Armt. Q.M.S., R.E.M.E., 4 yrs. Review. instnictor electronics, servo-mechanisms, synchronous A BOUT £550 will secure the services of a versatile and transmission, motors, power plants, installation. Elec enterprising engineer with over 15 years’ experience tronics, U.S.A.; 18 months’ tropical research, Nigeria. of electrical contracting and manufacturing, including 5 Capable, steady, ability to supervise. Seeks development years in administrative positions. Graduate I.E.E., work or sales. Salary £550-£600.—Box 9357, c/o The E.C.A. Silver Medallist, City and Guilds triple finalist, Electrcial Review. excellent refs. Would suit architect or consulting engineer TT’EEN young Engineer (28), disengaged Sept., desires or as works engineer, etc.—Box 9262, c/o The Electrical progressive position. Six years’ experience produc Review. tion and testing all types H.T. and power transformers, DVERTISER, 20 years’ Sales/Technical Radio T.C.O.L., auxiliary gear, etc. Five years’ mechanical A experience with principal companies, including experience boilers, prime movers, etc. N.E. Coast area Marconi’s Wireless Telegraph Company, requires appoint preferred, but not essential.—Box 9352, c/o The Elec- ment as Sales Engineer or Liaison between manufacturing trical Review. company and trade. Experience includes Broadcast Radio “Y/TAINTENANCE Electrician, disengaged, comprehen- Trade. Director Radio Instrument Company, Radio Officer sive knowledge all installations.—Box 9368. c/o The during war, appointed Admiralty 1944. Salary £400-£500 Electrical Review. according prospects. Write—Box 9312, c/o The Electrical ADIO Engineer (29) seeks post, preferably abroad. Review. R Apprenticed. C. & G. final radio communication 6 .M.I.E.E., A.M.I.Mech.E., age 38. Experience entirely yrs1. pre-army experience, including full-time lecturing- A on factory maintenance and power generation. Adapt 6 yrs. radar. 44 commissioned R.E.M.E. Maintenance oi able and practical. Any situation within London area work of non-static nature preferred.—Box 9 3 0 5 . c /o T h e considered.—Box 9321, c/o The Electrical Review. Electrical Review. wo ±ae August 9, 1946 E l e c t r i c a l R e v ie w 65 C A L E S : ^ m a n n manu?artMerntLondnn5n)-H ^ h*lC^ ^ fehe^ to cont!«t St0ck Reconditioned A.C. and authorities and trade r? noon f C°unections supply • Motors and Starters equal to new Dav anil ni«rh+ SUPERVISINGTnrF?rim3t?-C/^ ? ElectricalEevilw 7rOMpTFTFh?.U„Se S ^ a p h S . S.W 4 M a^4555 17 ® position with I nnd™ F Engineer (44) requires ^JOMPLETE Power Station Plant for sale, consisting of Will take complete mÎirni ? 1 caî erm 8 f°r Arst-class work, ronsider consultants' ™d lal? >ur- Would W p ■ 2 Turbos 5 om k w p ° ' 000 evaporation, 250 lb. concern or property nSSS-c r, r engineer to multiple orD*f.offi -B w ford*T ay to rllc o M°LM* Electrical Review. owners- Car.-Box 9349, c/o The Snecialists. Middlesbrough. ' of (3.5) seeks post of complete CONDENSERS. 21. 38. 146 kVA, 3-phase, 50 cyclS* a Z , F - c.orrecti°n. 200-amp., 3-phase. B B Trunkinv London 1 area.reear 'S Sound^kimwli^vp'nfontracting S V f ™dium contracting businessb S s Inin and accessories. 1,000 gals Switch nil > n . f industry. WnnM Would like k?owlcdge to i.,w tof e electrical®|ectrlcal conSttogcontracting rhe Electrtnai apphcation. Box * e^ “ t £UU application'~ Bo* W lo ^ h e ra ™ nti«ana#,d, (Electri?al) seeks position. and accounts.—Box 9363 c/o The^m'ent"-^i' b ' I?m'chases m m m m m OUNG man H k ft 0 u lh ? ®eotncal Review. Y or partnership '(smal’l clpital) K n V ? ^ S POSia ?n Gectrical. Capable driver*^“ . S f t e d ^ Y n i J? G !nan C28> retluires position as Elect. Serviceman car if req.L^Box 0w " U LDCTRIC Motors and Dynamos. We hold one of the F O R S A L E ig THURSO & DISTRICTJLECTRIC SUPPLY CO. LTD. E LI. et^ t (JCeW, ?iectGcal riili i°*machinery. n-We sup?Iy Send aU your types enouiries and si2 ito3 0 F TORS SPT in7omd ^ 35p kV.A EN G IN E /A LTER N A . WoBreds^eorfhnS rU1K* 3* E e to a t «o se, S S , j ■ comprising Ruston 45-b h d 750 r o m J^LECTRIC Motors. 1/3 h.p., 3.000 r.p.m., DC 110 C ^liS sJ^gle^r^- “ ^'¡7 E ^ ? 10 TaiiIe Eans> 220 volts D.C., oscillating and & S ^ « rS S 'i-trS m ho„a^ StaUon, B imso? °n load at Eiyereida Power lM d x P 1.pLneMF d & 4 n Pt*' Fag8S E°ad' Fe»*& ^LECTRIC W elding Plant, Engine and Electric A.C L td ? N o rth Hou?ehUGSr0anthdamDiStriCt j g g * SUPBly2o ^ driven, 300 amps, output, complete with weather The Electrical Review. W6ather* R hmTi™ If' Jwitchgear. comprising 500-a. 4-wire A . p w S f J & F °- L.tdA offer larse selection of used ~7, busbar chamber, mput 2 x 200 a. interlocked T P Electric Motors. A.C. and DC W rite — v i/o c switch fuses, output 6 x 100 a. T P fusTd " I t o s t ” Tabernacle Street. London. E.C.2 (Monarch 33577M) xfi switches and 6 x 25 a. D.P. fused “ Masta ” swhi.h»= A T l hei ?! Diesel Engines- w Sgi S lih » complete with iron framework. Manufactured by Berry's gener5O TaV230evo?/s?^rf'P'e.?ri?ssle? i Wit!l 12-S‘kW D.C. ^LECTRirrTV_ fB?V ° 25t' C/^ The ElectricS7Revi7w «9 RieeW volts . One 25-h.p. Davey Paxman; One , fo-r House. Complete equip- A t Ł 3? f n r “ 1 ^°-J- DC- venerator: Three ment for sale, mcludmg 20-b.p. Oil Engine Electric Atlas, ¿5 h.p., 40 h.p. and 80 h .p .; One 50-h n npw Generator and Booster Set. Switchboard, Batteiy^ and Engine; One 22 / 24-h.p. Dorman. 2DWD type- Motors, 200 voRs supply, in good running order. Inspec- Two Fowler Sanders, 6B, 84 h.p. and 95 h .p .; One 116- h.p. Tangye; One 110-h.p. Mirtlees with 200-volts D C |^ineers.PCambridg'e. dy * Barrett Ltd.. E lect||, One 110-h.p. Blackstone with 75 kW S c! nn 4 ? generator, One 140-h.p. Crossley, nearly new F L niSRa?operation. SCEN:? Prom J :!hokes' pt deliveries80 watfc' — Wax Micramatir* mied- siIeiQt TM in condition; One 144-h.p. Tangye with 72-kW D C 220-v Meico Works. Congleton. Cheshire ^cramatic Ltd., gAnen n m h r’ fTvamPS’ 4t ’ DunkeId E oad- Sheffield. 1881 JpLUORESCENT Fittings. Wholesalers can offer imme- A “ umber of Dynamos from 10-80 kW. 110 v. and 220 v. „„ . and regular dehveries of Super Quality 5' Trough tor belt drive or coupling, of various desrrinfinn«? BovVMi"by‘%eh TiP% Enits complete with "aU ¿ear- available.—The Electroplant Co.. Wembley. Middx 1993 ^ 3Sg,ElectrlcaI Review. A “umber of portable Alternating Lighting Sets, fully Lighting Chokes, 80 w att, ample core tv, guaranteed for quick delivery. 14-3kVA, 230/1/50 — ubfresuated and mounted in bitumen filled The Electroplant Co., Wembley. Middx. 1994 standard size steel boxes with mounting feet 230 volt A 5nd E .C. House Service Meters, all sizes, quarterly and prepayment, reconditioned, guaranteed one year LASb 7 « 5 T P °n* i3’ UplaDdS Way' London * kl Bhone.' Vicka Electrical Cki.y 47,* PLUORESCENT Lighting Fittings. Extensive range, Batters^ ttgh Street. S.W.ll. Tel. Battersea 0780. 19 iflcii1?,mg^TrSul? .and Flusb type, fitted with "All in A .U and D.C. Motors, all sizes, large stocks, fully 2?e. Constead Unit. Delivery 7 days, with tubes. - . gu^anteed.—MloEngineering Works. Milo Road. East Dulwich, S.E.22 (Forest H ill 2278-9). 9055 Phone. GEE.C203l * 6/7' 30110 Street' London' ^ SW ^ .C . Motors. 1 /75th h.p. to 5 h.p., all voltages. Also XpULLER Portable Electric Welding Set. 420 volts. 210 ,D-C.—The Johnson Engineering Co.. 319. Kennington Road, London, S.E. 11. Telephones, Reliance 1412/ 3. 57 U d ..^ k s^ * A E cU °S H*3* W* H' 3mi“ T3ATTERY Chargers for home and export. 4 models. 2-6-12 v.. 1, 2 or 4 amp. D.C., any mains voltage. G E?rE ?|Ep?ohten'MS?ns &„Co- Ltd- for guaranteed Elec- Generous trade terms. Write for catalogue.—The Banner Wn^i r r j Motors. Generators. Switchgear, etc.— Electric Co. Ltd.. Hoddesdon. Herts. Tel.: Hoddesdon V070? London. W .12 (Telephone. Shepherds Bush 2659. 97 224?). Estabhshedg1834.near (Telephone. Pudsey EEANTEE Festoon Striplight Holders, made of X20 B Bakelite. for use with / / .029 T.T.R. cable, require H EM y ^ n f Uty AriC, WeI?',ng PIants. 200 amps. Price no tools or screws for wiring. Immediate delivery of any T ~* £ol 10s. complete. Also Spot Welders______i «ic:__ quantity. Passed by the fire authorities. Used by cor T im iriO N * '? !' Biugley. Phone 1066. *50 porations and supply companies all over the world. Large J Electric Irons, supenor design and quality. quantities of British made. Electric Lamps and Cable ^ smtable stand. Also Junction Nickel- always in stock.—The Beeantee Illuminations (London) plated Torch Cases. Supplied for home trade and export Ltd.. Temporary Address.' 6. Upper Street, Islington. London. N.l (Phone. Canonbury 4555). 71 l^ n d o n ^ tw fL ^ T e L V iE°9550 E td "’ 9°* “ a “ ELT Grinders or Sanders. 4" wide belt. £5 5s.; 6" wide XTETTTE Elements. Mica Elements and Spiral all B belt. £10 10s—John E. R. Steel, Clyde Mills. Bingley Phone 1066. 52 August 9, 1946 6 6 E l e c t r ic a l . R e v ie w PIRAL Elements for electric fires, boiling rings, and ADDERS, single and extension, from—Ramsay & Sons S other appliances, supplied to order.—Electrothermal L (Forfar) Ltd.. Forfar. 9004 Engineering Ltd.. 270. Neville Road. London. E.7. i>4 ARGE quantity Galvanized Conduit Fittings, i to 14 . CJPIRALS. first quality. 500. 600. 750 and 100 w att. L —Higgins. 15, Kingsley Grove. Audenshaw. 1891 IO an voltages, for immediate delivery.—Box 59, c/o ARGE range of toasters, fans, portable and wall The Electrical Review. , L electric fires, radiators, convector heaters, floor TAFF Time Checking and Job Costing Tune Recorders standard and table lamps, electric irons (heat controlled S (all makes) for quick cash sale. Exceptional con and others), vacuum cleaners, hair dryers, novelty bowl dition. Write — Box 528, Smiths, 100, Fleet Street. iires, boiling rings, electric kettles, immersion heaters. London, E.C.4. . (Radios very shortly available.) Large range of torch TEAM Generating Plant. The following is a selection cases, cycle lamps and all types of lighting and H .i. S of sets available in our comprehensive stock: batteries, etc. Detailed list and catalogues available. 2,000-kW B.T.H. Turbo-Alternator. 6,600/3/50. 180/210- Place your orders in good time.—Brooks & Bohm Ltd- lbs pressure, complete with surface condenser and all 90. Victoria Street, London. S.W.l. Phone, Victoria auxiliaries, seen running. 1,250-kW Brush Ljungstrom 9550/1441. Inland Telegrams, ' Beebats, SowesL Turbo-Alternator, 400/3/50, 200-lbs., pressure, complete with surface condenser and all auxiliaries, seen running. LOIE S liE Dixon & Co. for Dynamos, Motors, Switchgear, Three 15-kW Steam Generating Sets, each consisting of L Chargers and Telephones.—214. Queenstown Road. vertical single-cylinder Steam Engine with steam pressure Battersea. S.W.8. Telephone, MACaulay 2159. Nearest between 100 and 160 lbs., direct-coupled to 110/115-volts Rly. Sta.: Queen’s Road. Battersea (S.R.). 18 D.C. Generators, new 1942/3. Full particularsi from— T\ /TONOMARK. Permanent London address. Letters re- Stewart Thomson & Sons (Liverpool) Ltd.. Fort Road. -1^*- directed. 5s. p.a. W rite—B’M/M 0N 053, W .C .l. 68 Seaforth. Liverpool. 21. Tele. No. Bootle 2697. or 28. l\/TOTOR Generator Sets and Convertors, all sizes and Victoria Street, Westminster, London, S.W.l., Tele. No. i-VI- voltages from 4 kW up to 500 kW in stock. Britannia Manufacturing Co. Ltd.. 22/26, Britannia Walk, AbTEAM10Turbine-Electric Generator Set, complete with City Road. London, N.I. Telephone, Clerkenwell 5512. S condensing plant. 350 kW, 400 v.. 50 cycles, steam 5513 & 5514. pressure 180-200 lbs., pass-out press. 25 lbs. Can be seen TTTOTORISED 4" Bench Drilling Machine. 13 speeds. running on load. Further particulars can be had from— 1VJL £12 2s. 6d.—John E. R. Steel, Clyde Mills. Bingley. Chief Engineer, George Lee & Sons Ltd., Wakefield. 1984 Phone 1066...... ,,, I UPERIOR Type Builders' Ladders now in production; TVTAMEPLATES, Engraving. Diesinkmg. Stencils. Steel S also Steps. Trestles and Extension Ladders. Phone— LI Punches.—Stilwell & Sons Ltd., 152. Far Gosford Shaftesbury Ladders Ltd., 453, Katherine Road. E.7. Street Coventry. . Grangewood 3363/4. .... , , NE-ton Short Wheel Base Open Trucks by Guy, Morris, ELEPHONES, complete units in aluminium clad cases O Ford, etc., new in 1941/43, ex M.O.S.. all in excellent T with control panels for 4, 8 and 12 stations. New condition. New batteries, good tyres, rugged construction Hand Sets with press key, 201 and 301 Jack plugs. Carbon and will withstand considerable hard w e a r . Prices from insets, Retardation coils and other telephone material. £120 to £180.—Mathew Brothers, Matbro Works, Sandy These are new Ministry surplus goods, suitable for Snips, Lane North. Wallington. Phone. Wallington 4050. 1899 Factories and Mines. Enquiries and inspection invited for NE 150-kW, l.oUU-amp., 100-volt, 900-r.p.m. Dynamo, home and export trade.—Jack Davis, 30, Percy Street, O by “ E.C.C.," 2 pedestal bearing.—Newman Indus London, W. 1. Museum 7960. ' . 1933 tries Limited, Yate, Bristol. . ESTING Sets, 500 V. (Record), new. imm. dly.. ACKING Cases, all sizes and descriptions, for home T £9 9s. 9d.—Robins Electric, 222, West End Lane, P and export trade; also S/h Cardboard Cartons, all N.W.6. Phone, HAM. 0879. »3 sizes.—L. Goldser & Sons. 14a. Rectory Sq.. London. E.l. TTSED Double Flanged Bobbins, good condition, 2,000 Phone. Stepney Green 2550. <•> U gross approx. Measurements 32" overall, 3i" traverse, HONE 98 Staines. 400-kW Beiliss Steam Set, 440 vo. 3" diameter flange. Will sell all or part. Joseph Harari, P D.C.. with condenser; 60-kW Allen Crude Oil Set. 42, Whitworth Street, Manchester. 99 220 vo. D.C.: 9-kW Ruston Crude Oil Set, 110 vo. D.C.: ACUUM Cleaner Parts. Hoses, braided, all diameters. 5-kW Diesel Set. 400/1/50 (Ruston); several Weir Pumps. V Commutators, bearings, fans, carbon brushes, driving —H arry H . Gardam & Co. L td.. Staines. 60 belts, brushes, attachments and fittings for all makes. LATING Generators, unused, several ranging from 350 Wholesale only.—Vacuum Cleaner Supplies, 543, Moseley P to 700 amps., 6 to 12 volt, plain or with A.C. or Road. Birmingham, 12. 80 D C motor drive. Particulars from—Stewart Thomson ATER Tube Boilers in stock. Two 25,000 lbs. evap., (Liverpool) Ltd.. Fort Road, Seaforth, Liverpool. 21 W 250 lbs. W .P.; One 25.000 lbs. evap., 175 lbs. W.P.: (Bootle 2697); or 28. Victoria Street, London. S.W.l Two 20.000 lbs. evap., 175 lbs. W .P .; Two 16,'000 lbs. (Abbey 2101). . , x 63 evap.. 190 lbs. W .P.; One 12.000 lbs. evap., 200 lbs. W .P.; V C and Cotton-Covered Bell Wire, single, twin, One 9/10,000 lbs. evap., 200 lbs. W.P. We install com P triple, and four core, in beautiful assorted colours, plete, including brickwork. Economisers, pumps, piping from 6s. 6d. per 100 yds.; send 6d. for samples and lists. valves, generating sets and motors in stock. Please send We also have in stock irons, flres, extension speakers, etc. us your enquiries: we can give immediate delivery. Bur- —Northern Industries, D ept. 8. 199 Broughton Lane ford. Taylor & Co. Ltd., Boiler Specialists, Middlesbrough Salford. 7. , . (Telephone. Middlesbrough 2622). 32 EBUILT Motors and Generators. Long deliveries can ELDING Equipment from stock. Portable Welders R often be avoided by purchasing rebuilt secondhand W by English Electric, complete with accessories. 12 plant. We can redesign or replace surplus plant of any kVA. single-phase. 50 cycle, primary volts 440/200, secon size Send us your enquiries. Over 1.000 ratings actually dary volts 80. secondary amps. 150 continuous, 250 amps, in stock here.—Dynamo & Motor Repairs Ltd.. Wembley maximum; welding current, min. 32 amps., max.253 amps. Park. Middlesex (Telephone, Wembley 3121. 4 lines); ateo D.C. Welding Controllers by Quasi-Arc Ltd., 80 volts, at Phoenix Works. Belgrave Terrace. Soho Road, Hands- 30-90 amps., ratings 4 minutes in 5, suitable for conver worth. Birmingham (Telephone. Northern 0898). 26 sion to heavy industrial resistances. Prices on application. OTARY Converters in stock, all sizes; enquiries —Cox & Danks Ltd., Plant Dept., Langley Green. Old R invited. — Universal Electrical, 221, City Road- bury. Birmingham. 1983 ELLOW Varnished Silk Tape: 40 gross yds. 1-5/16" VjOTARY' Converters, 200-kW, 6,600/3/50 input 230 Y w idth X 6 mils, thickness; 40 gross yds. li X 6 -tk' volts 2-wire D.C. output, complete with Trans mils.; 40 gross yds. 2-5/16" X 6 mils.; 45 gross yds. 3i former and switchgear. seen running in Liverpool. 2.000- X 6 m ils.; 45 gross yds. 4" x 6 mils. Varnished Cambric kW 6 600/3/50 input. 418/462 volts, three-wire D.C. Tape: 30 gross yds. 1" x 10 mils., straight cut; 30 gross output, complete with transformers, starting panels. D.C. yds. I t " x 5 mils., bias cut; 130 gross yds. I t " X 10 mils., machine panels. First-class condition. Two sets avail bias cut; 30 gross yds. 12" x 10 mils., straight cut; able —Stewart Thomson & Sons (Liverpool) Ltd- Fort 150 gross yds. 2" x 5 mils., bias cut; 150 gross yds. Road, Seaforth, Liverpool, 21 (B’ootle 2697); or 28, Vic 2" X 10 mils., bias cut; 30 gross yds. 2-5/16" X 10 mils., toria Street. London, S.W.l (Abbey 2101). 72 bias cut; 30 gross yds. 2-5/16" x 10 mils., straight cut. ACKS and Bags in excellent condition for all com Varnished Paper Tape, 2.5 mils, thickness; 15.000 yds. S modities. as low as 4d. each Write—John Braydon 2 7 m /m width; 25.000 yds. 1-23/32"; 40,000 yds. 1-27/32"; Ltd., 230. Tottenham Court Road. W.l. Tel. No. 50 000 yds. 52£ m /m . Leatheroid : 6 cwt. .010" thick in 1 cwt. rolls 50" wide; 45 lbs. .012" on roll 54" wide; Museum 6972. cwt. .032" thick in sheets 80" X 54".—Hirst. Ibbetson G ELF-Priming Electric Pumps. 300 6-P-h- & Taylor Ltd., 47. Chapel St., Salford, Manchester, 3. 1997 E R Steel. Clyde Mills, Bingley. Phone 1066. 53 to 20 kW D.C. and A.C. Petrol & Diesel Generating EVERAL unused Portable Grinders (Black & Decker). 5 Sets, some packed for shipment.—Box 87. c/o The S 5" and 6", for 110 volts, for sale ex stock—Box 2015. Electrical Review. c/o The Electrical Review. August 9, 1946 E l e c t r i c a l R e v ie w 67 1 V0P, r J e» d ; 1 s'kVA Transformer, 440/2,000 former. 'All for canwfn^mTV t 30_kXA Testing Trans- 2 G O 'kT ^ and 9°'kwJ Diesel Generating Sets, 440 volts 1 ■ •' comP°und wound, engines comprise Mirrlees cooking and heatini nSo^ -on domestic electrical vertical engines, new 1926. can all be seen running. Apply ment and when comnlefin f during course of develop- offers m ade to J ^Paratus can be seen and Box 798, Mason-Peacock L td., 184, Strand, W.C.2. 2003 Iro n Works BonnvhriiW c 7 ar i,d " Caledonia Stove 2 5 0 Eotary Converters (2). with transformers and 1 Fore»r „ „ „ V77™y■ \ ---- ' “ „ “ S', ge' ourungsnire,Stlrlingshire. Scotland. Scotland. 20 2016 f 4- .n sl ch« inPut 6.600 volts. 3-phase 50 cycles 1 output 420/210 volts; also A.C. and D.C. Motors S\vfirh- motor H?rV»e? Fai!’ complete ^and. 12-5-h p gear. Generating Sets, Welders, etc.—Midland Counties 50, c“£ r t t t h “s T r te ! 72° ir - & 4s4 0 TTOltrSH 3^ : & al Ew^neerlng Co- Ltd" Grice s W p o M l? 4cyc?esMi4 O30C°rmpPm e f? 2 9 0 - h* nDhG- n°prn?yfG'5-G ' 500 voIte- 750 r.p.m3? volts 600 r n'ni w i 't i ^ otoi by Dane. Dynamo Co.. 400 ^ ^ 5(foavoIts?U63C?la p?m£abMi 'bearings Mfrks“ e 7 L o n in Bl f . r|. L t d ' B|™ ARTICLES WANTED A Tp vapdi„0t™ thermoplastic scrap; polythene 66 G ? ft h00nes Cent.rdugal Tump, 1.425 r.p.m .i - u m S Wire* 13 to 41 s.w.g.. large and 6mall proDeTler Fmi ™rt“ eier' Wr?U mounted complete with Electrical Review?01 export--Box c/o The Review? Particulars—Box 1956. c/o The Electrical E NS ? fl* EING Tech™ al Book'S (new or secondhand) rh - a i ln„aay quantity. Attractive cash offers Call 3 de?“bcldgQ ' Ten>Perature Recorders up to 1,200 -Third floor 350. Oxford Street. W.l. or "Stoneldgh " t Avenrxe. Weybridge. oroneieign. Coud. , - Mi,rev'Murex 22.5-h.p.99 9 \ S Arc AeCOr-,ier,s.> Welding by CambridgeSets, 440 volts. Instrument 3-nh 50 cycles, 50, 150, 400 and 450 am ps.; Murex 8 5-h o' LAMPSHADE Materials wanted. Samples and details ditto o0. 100 and 150 amps.: 2-ton Herbert Morris Eleca T\/TANTJFACTURFRe FLOW INDICATOR This unique air-cooled compression ignition Diesel engine — fixed or portable — is Is a device for inserting in a pipe independent o f w ater supply and can be used line to show at a glance the flow anywhere for driving electric generators, in the circuit. The liquid spins pumps, air compressors, etc. Starts from cold a chromium-plated ring under a without priming and by hand. Compact, glass dome. If the flow stops, simple, accessible, reliable. the ring stops. Descriptive and illustrated literature on request to — Approved by the Admiralty. Please write tor Pamphlet quoting ref. 116/17-12 ARMSTRONGS WALKER , CROSWELLER Ł CO. LTD CO V E N T R Y ’ £ N G LAND CHELTENHAM GLOS. 61.1742 BRANCH OF HAWKfcK SIODELEY AIRCRAFT CO. LTD. He is the man who has to use the tools you provide and he knows their merits. There is a Flextol machine for every job, — Filing, Grinding, Scurfing, Polishing, Flexible Disc Grinding, Screw Driving, Nut Setting, etc. Send for Catalogue No. F 2 2 . LITHOLITE INSULATORS & POWER-DRIVEN HAND TOOLS ST. ALBANS MOULDINGS LTD Sega Irode Lsxa. ' More Power to your elbow * WATFORD Sole Manufacturers and Patentees : FLEXTOL ENGINEERING CO. LTD ■ PH O N E: W A T F O R D 4494 THE GREEN, EALING, LONDON, W.f Phones: EALing 6444/5/6. 'Grams : '• Dominating ” , Ealux. London. 9Î- I3 A 70 E lectrical Review August 9, 1946 “ BRITAIN GAN MAKE IT” W E’VE BEEN MAKING IT WE ARE MAKINGIT WE SHALL MAKEIT MANUFACTURING, Ironclad triple pole quick make- MECHANICAL AND and-break foot operated Switch. TYPE APS ELECTRICAL ENGINEERS Full particulars on application. I0YCE ENGINEERING LTD. DEWHURST & PARTNER LTD. INVERNESS WORKS • HOUNSLOW • MIDDLESEX THE QUADRANT, N.W.4 Telephone: Hounslow 008,518 Telegrams: Dewhursc, Hounslow H E N D O N 7437-8-9 Scotti^^ffic^Zo^B^nhsv^od^^^lasgow^^^^^Dou^lasOO?^ CHARLES CLIFFORD ______I P r o d u c t s — — — INCLUDE — ------PLUS ACTIVATED BRASS, COPPER & PHOSPHOR BRONZE and the undernoted SPECIALITIES T u b e s Copper Tubes for all purposes. Brass Tubes in various alloys and specifications. Aluminium Brass Condenser V Tubes il Al-d u r-b ra ” P at. N o. 308647. Phosphor Bronze Tubes, SOLDER solid-drawn. Gun Metal Tubes, solid-drawn. (¡.P.O. and AIR MINISTRY APPROVED SheBt & Strip Brass and Copper Sheet and Strip to any specification and in suitable temper for requirements. Phosphor Bronze Sheets and Strip. • NOW AVAILABLE C a s t in g s Chill-cast Phosphor Bronze and Gun Metal Bars. IN 60/40 R o d s Phosphor Bronze Rods (Drawn). Gun Metal Rods • ORDER NOW (Drawn). Zinc Battery Rods. AND BE SURE OF W ire All Wires for the Metallisation process of Metal YOUR SUPPLIES Spraying. Zinc Wire. Phosphor Bronze Wire. • SPECIAL TERMS FOR In g O tS Phosphor Copper. Phosphor Tin. WHOLESALERS I Supplied on Mb., 4 lb., 7 lb., 10 lb. IN A CHARLES CLIFFORD & SON LTD WORKS AT: FAZELEY STREET MILLS, BIRMINGHAM 5 (HEAD OFFICE) & The DU BOIS CO. Ltd. DOG POOL MILLS, BIRMINGHAM 30 15, BRITANNIA STREET ■ KING’S CROSS • W.C.1, folaphon«! Terminus 6624/5 • Telegram i i Bleitrao, Kincron, London A| M-W.44 August 9, J 946 E lectrical R eview 71 Manufacturers of Specialists In the moulding of Poly styrene, Polythene and Cellulose Acetate as applied to the Electrical Industry. W e shall be very pleased to forward any information requested. Small Rivets a speciality IN ALL SIZES FOR ALL PURPOSES 86 - 8 8 CONSTITUTION HILL ocfr/. (Bureau I ) Bl RM I NG HAM 19 Westmoreland Road, London, N .W .9 Phone: COLMORE 4010 Telephone : COLindale 8868/9 London Agent : E.^J. Cooksc.n,^^0 Devonshire Chambers, 72 E l e c t r i c a l R e v ie w August 9, 1946 AGRO ELECTRICAL Co. Ltd. Ele ctric B e lls B e ll Transform ers B e ll Pushes Bakelite Lam pholders C eiling Boses Junction Boxes9 e t c . Marketed by T.M.C.-HARWELL (SALES) LTD. BRITANNIA HOUSE, 233 SHAFTESBURY AVENUE, LONDON, W.C.2 Telephone: TEMple Bar 00S5 (3 lines) Telegrams: " Arwelidlte. Westcenl. London” T h e “ MOORHOUSE” One-piece cable connector Manufactured by SPERRYN & CO. Moorsom Street, Birmingham Established over SO years Also Manufacturers of General Electrical Accessories LARM MANCHESTER A1PPARATUS AY US A VIS BELLS, RELAYS, CONTACTS FOR Etc. WE ARE MANUFACTURERS OF FIRE and BURGLAR ALARMS UNIQUE DESIGNS IN TABLE LAMPS.* CENTRE LIGHTS ASSOCIATED FIRE ALARMS FITTINGS ETC., LTD. IXCHANGE ELECTRICALGPuu. SUTHERLAND WORKS, ST. ANDREW ROAD 4IXHEETHAM HILL ROAD. M /_G r_4.\ WALTHAMSTOW, LONDON, E.17 August 9, 1946 E l e c t r i c a l R e v ie w (.Supplement) 73 The For Safer, Surer CUP farthing: . . ADVANTAGES : with a Larger contact surface than any other Earthing Clip. Suitable for all sizes of conduit. A permanent safeguard against accidents. Coils of ¿ r i p ! «■ire under tension, therefore a perfect earth. 1 0 / 6 per doz. Subject to Trade Discount. O b t a in a b l e F r o m A l l L e a d . n o E l e c t r ic a l W h o l e s a l e r s AS SUPPLIED TOTHEG.P.O. Write for Samples- to — EARTHING CLIP M. MOLE & SON LTD., 51-56 CHARLOTTE ST., BIRMINGHAM 3 Centrifugal separation is the only practical method of purification for turbine oils. Outstanding features of De Laval centrifugal equipment are the reduction of moisture content to a negligible minimum, and constant high efficiency independent of the quantity of solid matter in the centrifuge bowl. Illustration of Littlebrook Power Station Is reproduced by permission of the Kent Electric Power Co a i c a , a ,/ a i CO. LTD.. GREAT WEST ROAD. BRENTFORD. MIDDLESEX.______Ealing 0116 P.B .X . Smee’s DL 67 August 9, 1946 74 (Supplement) E l e c t r i c a l R e v ie w THE M O D E R N PROMPT DELIVERY NOTE... H IG H S P E E D Another idea for Household Electrical Fittings, the Stand ELECTRIC ard Lamp with 3 scroll base. Adds charm and distinction to its surroundings .... INDUCTION MOTORS beautiful pastel shades that will tone with any interior Scophony fractional horse decoration . . . made of power motors are units light m etal—such is D uracraft, of concentrated energy the new metal-craft that is fast becom ing popular giving extraordinary high throughout the Electrical performances for their Trade. size. Specially designed for use in aircraft, marine Increase your sales by dis playing Duracraft Electrical craft and w herever space Accessories — they are real and weight are restricted, se lle rs . they are extremely reliable. A Scophony product means it is a precision job. All enquiries to :— Sales Office : 36 Victoria St., London, S.W.I Telephone : A B B e y 4852 u s e r a i t SCOPHONY ELECTRIC FITTINGS 0 l i m i t e d Sole Designers and Manufacturers % WELLS - SOMERSET L. F. PEATY & CO. LTD. KINGSTON BY-PASS, LONDON, S.W.20 LIMIT w □ □ □ 5 Â d o l p h i n engineering CD. l t d . STERLING WORKS. DAGENHAM- (SEVEN KINGS. 34EG) August 9, I946 E l e c t r i c a l R e v ie w (Supplement) 75 M e r s e y i-'NACRe U U ( n w l w a / i 4 r i t t l i V t ^ a e r o f i e r heats the whole room - not just one spot With the A ER O FIER Portable Space Heater a ll the room— floor to ceiling, wall to wall— gets evenly heated at once. Consisting of 2-kilowatt elehient and distributing fan, compactly built in, AERO FIER circulates warm air in winter, coolingairinsummer—eliminating stuffiness. O f attractive design and colour choice, A E R O F IE R looks well in any part of room or business premises. Robustly constructed. Thorough in sulation makes it burn-proof, scorch-proof. Here isaheaterofuruquesalesappeal. Retailsat£io. io Fu ll details and Trade terms from sole concessionnaires: C. J. FOX & SONS LTD., 117 VICTORIA ST., LONDON S.W.I AEROFIERTelephone: Victoria 0204 DISTRIBUTOR 76 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 Index to Advertisers PAGE Aerialite Ltd ...... 100 Agro Electrical Co. Ltd ...... 72 Air Ducts Ltd ...... 98 BAKELITE ACCESSORIES Alfa-Laval Co. Ltd ...... 73 Allen, W. H., Sons & Co. Ltd ...... 42 Alton Battery Co. Ltd ...... 41 ELECTRIC IRON ELEMENTS Armstrong Siddeley Motors Ltd ...... 09 Arrow Electric Switches Ltd ...... 92 Associated Fire Alarms Ltd ...... 72 Bakelite Ltd ...... *¡2 ELECTRIC FIRES, SPIRALS Baldwin Instrument Co. Ltd ...... °4 Barbour, Wm., & Sons Ltd ...... 88 OF FIRST QUALITY AND FINISH B arlow-W hitney L td ...... 92 Barns, W., & Son ...... 90 Belling & Lee L td ...... 12 B.E.N. Patents Ltd ...... 78 B enham & Sons L td...... 77 IRON CONNECTORS, THROUGH Bescol (Electric) L td ...... 22 Bill Switchgear Ltd ...... 3 Braithwaite & Co. Engineers Ltd...... 98 SWITCHES, COMBINATION AND Britannic Electric Cable & Construction Co. Ltd.. . . 40 British Insulated C allender’s Cables L td ...... 50 B/C ADAPTORS, MINIATURE British Mica Co. Ltd ...... • 100 British Thomson-Houston C6. Ltd ...... 5 & 43 Britmac Electrical Co. Ltd ...... 1° MAINS SWITCHES, H. AND L. B rooks & B ohm L td ...... 94 Bruce Peebles & Co. Ltd ...... 2 ADAPTORS WITH SWITCH, ETC. Brush Electrical Engineering Co. Ltd ...... 23 B urco L td ...... 20 Burdette & Co. Ltd ...... 56 Burn, George, Ltd ...... 26 Available for immediate delivery BX Plastics Ltd ...... 45 By lock Electric Ltd ...... 16 Cascade Water Coolers Ltd ...... 36 Caxton Wood Turnery Ltd ...... 34 GREAT NORTH (ELEC. MNFG.) Celestion Ltd ...... 28 . Clifford, Charles, & Son Ltd ...... 70 CO . LTD . Consolidated Pneumatic Tool Co. Ltd ...... 7 Copper Development Association...... 6 28 AYLMER PARADE, LONDON, N.2. Crabtree, J. A., & Co. Ltd • • • • • 37 Barnet By-Pass Crompton Parkinson Ltd ...... 35, 46 & 81 j Croydon Engineering Co. Ltd ...... 16 Cryselco Ltd ...... 10 Davall Bros. Ltd ...... 24 Davis & Timmins Ltd...... 102 D ean B ros...... 78 POWER TRANSFORMERS Dennis, G. P., Ltd ...... 28 Dewhurst & Partner Ltd ...... 70 of Q U A L IT Y Dolphin Engineering Co. Ltd ...... 74 Donovan Electrical Co. Ltd ...... 100 up to 3 5 kVA Dowler, F., & Sons...... 30 (As supplied to Downes & Davies...... 77 H.M. Government) Drake & Gorham Wholesale Ltd ...... 8 Du Bois Co. Ltd ...... 70 Duratube & Wire Ltd ...... 102 by THE Elcordia Ltd ...... 86 Electrolux Ltd ...... 99 & ELECTRICAL CO. LTD. Ellard, Henry, & Sons Ltd ...... 84 Eastern Works, Eastern Rd. Ellison, G eorge, L td ...... 96 Walthamstow, E.I7 Enfield Cables Ltd ...... 19 Engineering & Lighting Equipment Co. Ltd ...... 15 English Electric Co. Ltd ...... 9 Evans, F. W., Ltd ...... 102 Agents in— Tyneside, Manchester, Midlands, Bournemouth, etc. Everett Edgcumbe & Co. Ltd ...... 54 Exchange Electrical Co...... 72 Falk, Stadelmann & Co. Ltd ...... 101 Fan Manufacturers’ Association Ltd ...... 93 Ferranti Ltd ...... 11 & 95 Firth, Thos., & John Brown Ltd ...... 90 PAT. B.S.I, Flextol Engineering Co. Ltd ...... 69 PEN. [ j P ^ Fox, C. J., & Sons Ltd...... 75 French, W. T., & Son Ltd ...... 30 First Grade Friedland, V. & E., L td ...... 90 Geipel, William, Ltd ...... 94 General Electric Co. Ltd ...... 38 & 58 PLASTIC Godwin, H. J., Ltd ...... 94 Great North (Elec. Mfg.) Co. Ltd ...... 76 Harland Engineering Co. Ltd ...... 31 PLUGS Heatrae Ltd ...... 1 NO CABLE CLAMPS OR Henley’s, W. T., Telegraph Works Co. Ltd. Cover iii & 13 S C R E W S Hick, Hargreaves & Co. Ltd ...... 34 EXTRA SAFE EARTH Higgs Motors Ltd ...... ••••• •• ...... 25 Hopkinson Motors & Electric Co. Ltd ...... 86 SELF-ALIGNING PINS H orstm ann G ear Co. L td ...... 89 W fH Igranic Electric Co. Ltd ...... 79 {Continued on page 78) August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 77 Electric Heavy Duty” Range Unit COOKING APPARATUS J^U IL T in units needing only to be joined together to form wall or central pattern stoves to suit chefs’ require ments. Modern “ streamlined ” vitreous - enamelled finish, w'ith attention to all electro-technical points — accessibility, spares, etc. BENHAM & SONS Ltd., 66 Wigmore Street, LONDON, W. I Branches at BOURNEMOUTH. BRIGHTON. BIRMINGHAM, MANCHESTER, CARDIFF, GLASGOW,’ DUBLIN 3 7 YFARS m re i|able SERVICE IN THE DISTRIBUTION C M A Cables of E L M A Lamps RELIABLE A S C M Conduits S U ^ * p "|L ?E S E L F A Fittings B E A M A Heatingand Cooking Appliances Ironclad and Branch Switchgear Accessories in General WE HANDLE HIGH-CLASS MATERIAL ONLY OUR ADDRESSES: LIVERPOOL MANCHESTER CARLISLE BIRKENHEAD 1-9 Stanley St. 3a, Norfolk St. Paternoster 94 Chester St. Pall Mall Row DOWNES & DAVIES 78 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 Index to Advertisers ( Continued from page 76) page Injection Moulders Ltd ...... 71 International Electrolytic Plant Co. Ltd...... 14 DEAN BROS. loco L td ...... 24 HAYDN RD. NEW BASFORD Itonia Battery Co. Ltd ...... 34 Johnson & Phillips Ltd...... 49 NOTTINGHAM Tel .6 4 2 0 7 Joyce Engineering Ltd ...... 70 Kango Electric Hammers Ltd...... 53 Kerrys (Great Britain) Ltd ...... 32 Langley London Ltd ...... ■ 32 Laurence, Scott & Electromotors Ltd Cover l Ley’s Malleable Castings Co. Ltd ...... 39 Litholite Insulators & St. Albans Mouldings Ltd 69 Londex L td ...... 102 L ondon Electric W ire Co. & Sm iths L td ...... 44 Macrome Ltd ...... ¿2 Maybrey, H. J., & Co. Ltd ...... °0 McGeoch, William, & Co. Ltd ...... 94 McKechnie Bros. Ltd ...... 10J M .C .L. & R epetition L td ...... 1 Measurement Ltd ...... 57 Measuring Instruments (Pullin) Ltd ...... 22 M ercury Switch Mfg. Co. L td ...... 16 Mersey Cable Works Ltd ...... 75 Metropolitan-Vickers Electrical Co. Ltd.. .C o ve r 11 & 85 Metway Electrical Industries Ltd ...... 24 Mica Products Ltd...... 92 Midland Electric Mfg. Co. Ltd...... 27 M ole, M ., 8c Son L td ...... 73 M onm er F oundry L td ...... 98 Morecambe Electrical Equipment Co. Ltd ...... 88 Moulded Products Ltd ...... 14 Nalder Bros. 8c Thompson Ltd ...... 21 National Fire Protection Co. Ltd ...... 83 Newman Industries Ltd ...... 87 Normand Electrical Co. Ltd ...... 51 ALL STEEL CABLE DRUMS Overseas Engineering Co. Ltd ...... 40 Parmiter, Hope 8c Sugden L td ...... 79 BOBBINS & REELS FOR ALL Pearson, C., & W. P. Beck L td ...... 71 PURPOSES Peaty, L. F., & Co. Ltd ...... 74 ENQUIRIES INVITED Perkins, F., Ltd ...... 33 Philips Lamps Ltd Cover iv Poles L td ...... 100 Power Equipment Co. Lid ...... 84 Predico L td ...... 74 Process C ontrol G ear L td ...... 80 Pyrotenax Ltd ...... 97 Revo Electric Co. Ltd ...... 91 Reyrolle, A., & Co. Ltd ...... 48 Robinson, Lionel, & Co. Ltd ...... 36 Romac Industries Ltd ...... 32 Ross Courtney & Co. Ltd ...... 1 Runbaken Electrical Products...... 102 Salford Electrical Instruments Ltd ...... 20 Comprises essential equip Scholes, G eorge H ., & C o. L td ...... 8 ment for continuous spray Scophony Ltd ...... 74 painting, including Spray Siemens Electric Lamps 8c Supplies Ltd ...... 3 Gun, Pressure Paint Con Sim m onds 8c Stokes Ltd ...... 93 tainer,Hose and connections. Smiths Industrial Instruments Ltd ...... 80 W rite for Catalogue C.B.36. Sparklets Ltd...... 16 Speed T ools L td ...... 88 B.E.N. PATENTS LTD. Sperryn & C o...... 72 Spicers Ltd Cover 111 HIGH WYCOMBE. BUCKS Spiral Tube & Components Co. Ltd ...... 98 Standard Telephones & Cables Ltd ...... 17 Stanton 8c C o ...... 76 Steatite Insulations Ltd ...... 28 Sterling Cable Co. Ltd ...... 99 Symonds, R. H., Ltd ...... 28 LET HELP Taylor Tunnicliff 8c C o . L td ...... 4 Thompson, R. E., & Co. (Sudbury) Ltd ...... 30 T.M.C.-Harwell (Sales) Ltd ...... 72 Transformer & Electrical Co. Ltd ...... 76 WITH YOUR POST-WAR PROBLEMS ON ALL Tudor Accumulator Co. Ltd ...... 97 Venner Time Switches Ltd ...... 71 Electro-Mechanical Apparatus Veritys Ltd ...... 55 Viscose Development Co. Ltd ...... 47 Walker, Crosweller & Co. Ltd ...... 69 Solenoids and Electro-Magnets Walsall Conduits Ltd ...... 29 F O R TECHNICAL ADVICE, WRITE Walters, Austin, & Son Ltd ...... 89 Ward & Goldstone Ltd...... 39 WESTOOL Ltd. Westinghouse Brake & Signal Co. Ltd ...... 82 Telephone: ST. HELENS AUCKLAND Westminster Engineering Co. Ltd ...... 1 WEST AUCKLAND Westminster Laboratories Ltd ...... 86 BISHOP AUCKLAND Westool Ltd ...... 78 Co. DURHAM 317 Wilcox,[Edward, & Co. Ltd ...... 26 August 9, 1946 E l e c t r ic a l R e v ie w (Supplement) 79 FUSES Guaranteed high breaking capacity. Easy and cheap rewirability. Thermal capacity and time-lag. Freedom from deterioration. Low operating temperature. Low fusing factor. The Aeroflex range o f PARMITER, HOPE & SUGDEN LTD. fuses is supplied in capacities up to 1500 amps Longsight, Manchester I 2 London : 34 Victoria Street, S.W. I m m in Equip your electrically driven machines with the “ right ” control gear — IGRANIC, which will give positive protection to motor and machine and keep them working to secure maximum production. Illustration shows IGRA N IC Contactor Panel for control of Travel motion of 6-ton Slab Charger for Steel Mill. IGRANIC ELECTRIC C ? LTD BEDFORD & LONDON 8 0 (Supplement) E l e c t r i c a l R e v ie w A ugust 9, 1946 Now in Production n n . n i THE GP-TIMBR FOR THE ELECTRONIC i n s t a n t l y TIME CONTROL and accurately • OF The A.T. Hand Tachometer is a machine INDUSTRIAL pulse-feeler. Any moving part of any machine that can be reached by hand can be OPERATIONS reached with this instrument. The A.T. Hand Tachometer, applied to Illustrated Leaflet Dl any rotating or travelling part gives an will be sent on application immediate reading of the speed with con sistent accuracy (to within £ of 1 per cent.). PROCESS CONTROL GEAR Any fluctuation of speed is instantly detected. By pressing a convenient button the reading LIMITED can be held after disengaging. 56 VICTORIA STREET, ST. ALBANS Reads irrespective of the direction of rotation. P h o n e : ST. ALBANS 2030 Recording range of 0 to 50,000 r.p.m. The instrument w ill stand up to the most arduous conditions and maintains accuracy at all temperatures up to 50°C. The movement in the A.T. Hand Tacho meter is identical with that selected to withstand the terrific vibration and gruel ling conditions in tanks and. other fighting vehicles. The set includes male and female rubber centres and a disc attachment for surface and cutting speeds. In a ser viceable and attractive case (as on right) complete £12. 12s. T H E A .T . HAND TACHOMETER ALUMINIUM ALLOY-v-CAST IRON Aluminium Die Castings cut out machining and give a better and cheaper article MAYBREY’S SPECIALISE IN: HIGH GRADE SAND AND GRAVITY DIE CASTINGS IN LIGHT ALLOYS SM ITHS INDUSTRIAL PATTERN AND DIE MAKING X-RAY AND MECHANICAL TESTING INSTRUM ENTS IP H. J. MAYBREY & CO. LTD. Crlcklewood Works, London, N.W.2 ALUMINIUM ALLOY FOUNDERS A.I.D. APPROVED AIR MINISTRY, MINISTRY OF SUPPLY AND The Industrial Instrument Division ol S. Smith & Sons ADMIRALTY CONTRACTS (England) Ltd. Associated Companies : A.T. Instruments WORSLEY BRIDGE ROAD, LONDON. S E 2« Ltd., David Harcourt Ltd. BECKENHAM 0044 August 9, 1946 Electrical Revifav (Supplement) 81 SCENE FROM EGYPTIAN TOMB (1500 B.C.) WEIGHING TEMPLE GOLD TRIBUTE Crown copyright From an exhibit in the Science Museum. South Kensington ( R o m p i o n m E T E R S ... HAVE MADE A NAME FOR ACCURACY cKomPTon^pnRKinson 82 ( Supplement) Electrical Review August 9, 1946 BATTERY CHARGING * METAL RECTIFIERS for charging radio and car batteries, m iners’ lamp batteries and those of electric vehicles and trucks. Self-regulating “ Westat ” equipment for telephone batteries. Charging plant for electrical power station batteries. Emergency lighting equipment. Send your requirements to WESTING HO USE BRAKE & SIGNAL CO., LTD. 82, YORK WAY, KING’S CROSS, LONDON, N.l August 9, 1946 Electrical R eview (Supplement) 83 Do you lmow when fire will break out in your premises ? Be prepared against such a possibility. Install “ National” the most efficient fire fighting equipment on the market and take advantage of our maintenance service tp ensure you are always ready to combat the danger wherever and whenever it threatens. WRITE FOR ADVICE THE ON YOUR OWN PARTICULAR RISKS NATIONAL FIRE PROTECTION COMPANY LIMITED, RICHMOND • SURREY T ele p h o n e R IC H M O N D 2 3 4 2 -3 - 4 p 84 (Supplement) E lectrical R eview August 9, 1946 THE “ROCON SWITCH A snap action, 4 position Rotary Switch with a wide range of applications. A combination of discs (each 30 amperes capacity) with differently shaped moving con tacts, spacing of fixed contacts and terminal arrangements makes the “ RO CO N” adapt able to your needs. Send us your problem, we shall be pleased to advise you prices and dimensions. KINGSBURY WORKS LONDON, N.W.9 HENRY ELLARD & SONS LTD. BALDWIN' Eatabliahed 1868 P ‘MUFER’ 0 Specialists In Presswork, Spot- welding, Riveting, etc. CAPACITY BRIDGE This instrument which 0 Custom ers’ own designs and has a range o f 0' 00005/nF. Patents manufactured and to 4‘Ofj.F., em bodies developed in strict confidence. advanced features of design which give quick 0 Grids, Fittings, etc., for and simplified reading. Electric Stoves, Cookers and Refrigerators a speciality. Fully descriptive Prompt attention to all enquiries leaflet supplied on request Telephone : Willenhall 18 Telegrams : “ Ellard, Willenhall ” BALDWIN INSTRUMENT COMPANY LTD. MIDLAND WORKS London Office : GRAND BUILDINGS • TRAFALGAR SQUARE • LONDON, W.C.2 WILLENHALL, STAFFS Telephone : W H Ite h all 3736 August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 85 c c d à * * ct A I R BREAK The well-known, wide range of Alr-Break Starters made by Metropolitan-Vickers has now been extended by the addition of the Type A AT 41 Auto Transformer. M a y we send you leaflets ? The new handy size —THE METROVICK FLUORESCENT 4 FT. LAMP - - E/Aboi 86 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 For quick, safe and economical repair of commutators and other electrical equipment Westminster Commu tator Cement o'fers a cheap, efficient, quick method of curing dam aged insulation without holding up the machine for more than half an hour. There is no need to remove the armature orskim the commutator with a grinder. Dam aged mica can be easily removed and gaps filled until trouble develops before with Westminster Com ordering. W ith present delays in mutator Cement on the delivery valuable tim e may be lost spot, making a perma and the machine may remain idle nent repair and saving for several days or weeks. considerable time, ’ Every user of electric motors should money and labour. keep Westminster Commutator Cement Used by Electrical Undertakings, outfits handy in case of emergency. A Government Departments, Lon sound investment ! Obtainable direct don Passenger transport Board, National Physical Laboratory, from the manufacturers. Railway and Shipping Com complete outfit panies, Collieries, Stores, etc. costs only 17/6 WESTMINSTER LABORATORIES LTD., Chalcot Rd., LONDON, N.W.1 HOPKINSON concordia MOTORS & ELECTRIC CO LTD CONTACTS STANDARD RANGE: in Three-phase Induction Motors TUNGSTEN J to 30 hp £r> SILVER A N D Répulsion-Induction Motors SILVERALLOYS \ to 5 hp IRIDIO HEAD OFFICE: Grangeway • Kilburn • London NW6 PLATINUM Telephone : Maida Vale 9306-8 Cables : Origimotor London Made by THE LONDON PLATINUM SCREW MFG. CO. LTD. ELCORDIA LIMITED 225 Westminster Bridge Road, London, S.E.I Tel. : Waterloo 5502-3. Grams : Elcordia, Lamb, London August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 87 88 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 FOR LACING SWITCHBOARD CABLES also BINDING LINEN THREAD No, 30. 3 cord Beeswaxed to P.O. Specification, on 2-oz. cops. WM. BARBOUR & SONS LTD. . LISBURN . N. IRELAND f a s t e t Speetol• REGD.TRADE MARK Soldering QUICK ACTING Vtazlngt SOLDERING CLAMP Welding This clamp enables tw o pieces o f m etal to be held together at right angles during tacking operations prior to soldering, welding or brazing. I t is extremely simple, like all good ideas. Patents pending. tÊm Ê&^Upenecl MODERN DIRECT SWITCHING STARTERS b y t h u m b FOR SQUIRREL CAGE MOTORS —.p re s s uro^ Robust design - Competitive prices Reasonably good deliveries ft WiM \ fined W e can be of immediate service to you a n d g r ip s s e c u r e ly MORECAMBE ELECTRICAL EQUIPMENT CO. LTD. O S S w i Ctov.P'.Zt WESTGATE WORKS, MORECAMBE c^cial‘sts g j-Sp jy T eed 7eeis£*£ 35/6 PERCY STREET. LONDON W 1 Mu%rumlOÎ9 't099 Telephone 1414 & 1415. Telegrams: “ MEECO ” August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 89 AUSTIN WAITERS & SON manufacturers o f STORAGE EQUIPMENT 020000000001010101010102020200000000000000000001010101485353535353532323232323 Bins and Shelving single and double-sided STORAGE RACKS fo r small parts Removable Trays III^ ■ —mi«- TOOL CABINETS 39 ' x 18 ' x 15'' Lock and Key TIME SWITCHES & SYNCHRONOUS MOTORS STEEL WORK BENCHES 8 0" X 2' 6" x 2' 8" Two Lockers with Padlock and Key HORSTMANN GEAR AUSTIN WALTERS & SON LTD. COMPANY LIMITED, Old Trafford, MANCHESTER 16 NEWBRIDGE WORKS. BATH. TEL.7241 90 ( Supplement) E l e c t r i c a l R e v ie w A ugust 9, 1946 NICOSEL CLASS TO METAL SEALS ( LOW EXPANSION STEEL) SPECIAL ALLOY STEEL “ Nicosel ” is a valuable British contribution to the Arts of electric lamp and vacuum tube CLASS TO METAL SEALS manufacture. Its low co efficient of expansion makes it eminently suitable for modern developments of the glass and electrical industries. F.B. 555 CLASS TO METAL SEALS Q i r a s ™ ' Sim bell ’ PERFORATED HETAU ELECTRIC BELLS j FOR ALL ELECTRICAL REQUIREMENTS ‘ Sesame ’ & ‘ Dimex’ f Perforated Lead for Batteries PUSHES ' Lightspot' CABLE-TRAYS a n d BENDS ILLUMINATED BELL PUSH f FOR ELECTRICAL WIRING ' V icto r ' & 'T r a n s a ’ BELL TRANSFORMERS I 'L u m in a m e 1 ILLUMINATED NUMBER PLATE j ' Quickfit' COMBINED TRANSFORMER I AND BELL TRAY SIMBELL ¿I ©j) Battery or U w M Transformer W . BARNS & SON Electric Bell Wholesalers please write for leaflets . I (Established I860) GLOBE WORKS, QUEENSLAND ROAD, V. & E. FRIEDIAIMI) LTD. | HOLLOWAY, LONDON, N.7 Lower Heys Mills, Macclesfield, Cheshire J Telephone: N O R T H 3347/8 Telegrams: "PERFORATION. HQLWAY, LONDON” Scientific H. 1 August 9, 1946 E l e c t r i c a l R e v ie w {Supplement) 91 JU r 111 4 o # á . COMPACTNESS LJ. n u s u ¡ J 11 \ L 0 U J 1 I r i l l § mm i 0 Ü u -MÊ • . . standardises and simplifies the control, extension and maintenance of the domestic supply . . . Ensures householders safety from shock by shielding of internal metal parts and elimination of re-wirable fuses. One switch in control . . . Inter changeable components . . . Can be used with most meters . . . Complies wj>h E.D.A. Specification Full particulars on application to REVO ELECTRIC CO.LTD..TIPTON,STAFFS 92 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 Engineers i n Plastics V J SPECIALIST MOULDERS AND FABRICATORS • Mould designs “ B-W ’* OVENS for Drying, Baking, etc. Also impregnating Plants, Wax, Tanks, Glue and • Injection and Com Compound Pots, Furnaces, etc. Ask for list ER/O £ BARLOW-WHITNEY LTD] pression Mouldings COOMBE R? NEASDEN LANE,LONDON.N.W.IOC1 • Round and Square Tubes • Bobbins, Formers, etc. • Machined Insulations 30 and 60 amp • “ Perspex” and DOUBLE POLE TUMBLER SWITCHES Acetate Fabricators • InsulatingComponents For Flush and Panel Mounting Cat. No. 80094 (30 amp) in all Materials Cat. No. 80060 (60 amp) MICA ARROW PRODUCTS $% VIT€H E S Arrow Electric Switches Ltd. HANGER LANE, LONDON, W.5 T e l . : Perivale 4451 August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 93 Jfatt ifctamtfatturers’ Ustëoriatton A Technical Group formed by the leading THIS ASSOCIATION SHOULD NOT firms in the Fan Engineering Industry for BE CONFUSED WITH ANY OTHER the purpose of advancing and spreading FAN ASSOCIATION knowledge in Fan Technology FOUNDER MEMBERS : Its individual members are manufacturers ALLDAYS & ONIONS LTD., Great W estern W orks. Birmingham I I and specialists in all branches of Fan ^"D., Sirocco Engineering Engineering, such as : W orks, Belfast JAMES HOW DEN & CO. LTD.. 195 Scotland Street, AIR CONDITIONING • HEATING Glasgow, C.5 KEITH BLACKMAN LTD., Mill Mead Road, Totten AND VENTILATING • DUST h a m , N . I 7 MATTHEWS & YATES LTD., Swinton, Manchester EXTRACTION AND COLLECTION MUSGRAVE & CO. LTD., St. Ann’s Ironworks, Belfast DRYING • FORCED AND INDUCED STANDARD & POCHIN BROS. LTD., Evington DRAUGHT • FUME REMOVAL • Valley Road, Leicester STURTEVANT ENGINEERING CO. LTD., 25 PNEUMATIC CONVEYING . BLAST W orcester Road, Sutton, Surrey THERMOTANK LTD., Govan, Glasgow FOR FURNACES • MINE VENTILATING WALKER BROS. (WIGAN) LTD.. Pagefield Iron works, Wigan -AND WHEREVER FANS ARE USED MANUFACTURERS’ ASSOCIATION LTD., 23 QUEEN SQUARE, LONDON, W.C.1 WEATHERPROOF Terminal METAL-CLAD Terminal Socket & Cover with through sealing cham PLUGS & SOCKETS ber and glands gland for cable S to 300 Amp. 2S0/500 Volt 3 and 4 Pole Earthed Type and 2 Pole. For Electric Lighting and Power, Trans mi is / on, Communication, Portable Tools, etc Manufactured by SIMMONDS & STOKES LTD. VICTORIA HOUSE. SOUTHAMPTON ROW, LONDON, W.C.I HOLBORN M37 94 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 T pie trams: “ Patella, Sedist, London ” Telephone: Hop 0594 (4 lines) CABLE V.I.R., BRAIDED, LEAD COVERED & TOUGH RUBBER SHEATHED U f l l l l A M C F I D F I I T R Head Office : 156-170 Bermondsey Street, LONDON, S.E .1 VTILLIIIPI UEIrCL LIU* Cab|e Works: WEMBLEY. MIDDLESEX * GODWIN ELECTRIC PUMPS 'N TYPE A.I.E. P A TEN TED ELECTRIC PUMP Is o n e o f a ran g e Etc. particularly useful where light and efficient duty Is required. It has a capacity of 250 G.P.H. WILLIAM to a head of 80 feet and Is fitted with Totally enclosed Self-oiling Mechanism with BALL BEARINGS throughout. O ther special features Include non-corrodiblelGUN METAL PUMP BODY, STAINLESS STEEL PISTON ROD and also McGEOCH &C0' LTD- AUTOMATIC GLAND ADJUSTMENT which reduces friction to a minimum. W rite for fully illustrated lists, prices and Warwick Works, 46 Coventry Road generousdiscountsof the comprehensive range of Godwin A Electric Pumps and Water Systems. , BIRMINGHAM 10 H . J . GODWIN LTD . also G L A S G O W and L O N D O N QUENINCTON GLOS. “ Wonda-Toaster” SUPERIOR CONSTRUCTION, NICKEL OR CHROMIUM PLATED It HEAVY COPPER—4CL-, ANODISED ALI OY—37 6 . ANODISED BODY AND ALLOY DOORS—35/-, ALLOY THROUGHOUT-30/-. No P.T. and generous Trade terms. One of the many attractive lines available (or FAIRLY PROMPT DELIVERY I Large Range of Portable and Wall Electric Fires, Radiators, Convector Heaters, Oak Floor Standard and Table Lamps, Electric Irons, Vacuum Cleaners, Hair Dryers, Novelty Bowl Fires, Boiling Rings, Electric Kettles. Immersion Heaters, Electric Fans, Torch Cases, Cycle Lamps, all types of Batteries ( " A” Class), etc. Detailed List available Place orders in good time BROOKS & BOHH LTD. August 9, 1946 E l e c t r i c a l R e v ie w (Supplement) 95 n o w . . . t i i t The Ferranti Dual-Range Clip-on Ammeter —for some years the leading in strument for easy clip-on’ current measurement — has now a big brother 1 The ‘7-Range’ has grown up in the midst of busy war-time production and is now ready to establish a new lead in the quick and easy measurement of currents in A.C. con« ductors. Fully Insulated Takes cables up t in. diam eter. Accuracy-3% o f lull scale Weight—i lbs. xddaNTI LTD., HOLLIN WOOD, LANCS. -ERRAN • kern house, KINGSWAY. W.C.2. .ondon O '11" 96 Supplement) E l e c t r i c a l Review August 9 ,1946 This is just an ordinary Ellison electric switchboard doing an ordinary job of work. It does, however, claim to be unique in that there is no other Ellison Switchboard quite like it. Every Ellison Switchboard is made for its particular job. it may be multi-tier; it may have any combination of circuit breakers of from 20 amps up to 3000 amps ; it may have cables approaching from above or below the busbar chamber. With these and other G e o r g e E l l i s o n variations as required an Ellison Switch board can be built from stock parts to i i K H i m a m suit practically any situation and service. 530 August 9, 1946 E l e c t r ic a l R e v ie w (Supplement) 97 F c t , l o a f o E C e c P v l c a C P u n ^ y c d e A - It is noteworthy where Tudor ac whether they were installed only yes cumulators are to be found fulfilling terday, or over thirty years ago—as the most important duties. Over 500 many of them were—they are to-day British Power Stations installed functioning with consistent efficiency. Tudor. Many Tudor installations SAFETYLYTE rank among the largest in the land is the Tudor Emergency Lighting System, which is automatic and in and have an enviable reputation for stantaneous in operation. It is instal led in thousands of schools, hospitals, long-lived reliability. No matter factories and other large buildings The Tudor Accumulator Co. Ltd. ACCUMULATORS 50 Grosvenor Gardens, London, S.W.r. SLO ane 0168/9 WT3 8 b /4 4 J-JER E is a standard ceiling fitting wired with “ Pyro- tenax” Copper Covered M .I. Cable. This means a connection that is electrically and mechan ically sound, and one which gives protection against moisture, oil, fumes and fire. This is assured firstly by the cable itself—because it is composed wholly and solely of copper and a mineral insulant—and secondly because of the perfect seals. Illustrated is a recessed-in ferrule seal in common use on lighting circuits for offices and domestic premises. Other types available include Indus trial and High Temperature Seals. There are also Flame proof Glands for use with any of these seals. A ll are designed " Pyrotenax ' Cablet comply with i.E.E . and to maintain the high efficiency Lloyds regulations. Supplied with single or multiple “ Pvrofeniiv r'flHleR cores in a wide range of current ratings. OI pyrotenax i^aDJeS. PYROTENAX LTD., HEBBURN / c o p p e r c o v e r e o ^ ^ CO. DURHAM Telephone : Hebburn 32244/5 P v r o lo i u v v LO N D O N : 7 Victoria St., S.W. I. Phone: ABBey 1654 BIRM INGHAM : Nelson House, 2 Moor St. Phone : Midland 1265 GD.25 98 (Supplement) E l e c t r ic a l R e v ie w August 9, 1946 a j jf JK rn# W H e A V T o r l ig h t - frames and cases are all just sheet metal fabricated to the customer’s requirements From customers’ specifications A ir Ducts will make to order: feeder pillars, telephone boxes and cubicles, busbar chambers, connection boxes, instrument panels, and frames and cases of every description. They work in all sheet metals, including steel, duralumin, aluminium and other non-ferrous metals. ... Great West Road, Brentford. Telephone : Ealing 6655. Telegraphic Address : " Airdux, Brentford1 BRAITHWAITE USE Pressed Steel ,. 0 « ■ “ S , " K S Tanks — for speedy and | BRAITHWAITE & CO. ENGINEERS, LTD. economical production • London Office (Temporary Address): Send us your enquiries 45 King’s House, Haymarkat, London, S.W.I Telephone : W H I 3993 Telegrams : Bromkirk-Phone MONMER FOUNDRY LTD. ST. ANNES ROAD. WILLENHALL, STAFFS The Spiral Tube and Components Co. Ltd. Technical Department OSMASTON PARK ROAD, DERBY Head Office - Honeypot Lane, Stanmore, Middlesex Telephones - Derby 46067-8 Edgware 4658-9 Telegrams-SplralDerby46067;Splratucom Phone London 1 ^ 0 E l e c t r ic a l R e v ie w ( Supplement) 99 NOW IN P R O D U C T IO N - Electrolux refrigeration Electj olux Silent Refrigerators are operated by Electricity. Having no machinery, no moving parts, it is their perpetual SILENCE and freedom from vibration which makes them a popular choice. Emphasis is laid on e r f e c t l y p l a n n e d their proved ^ CIRCUITS DEMAND dependability SPECIALLY PLANNED CABLES Maintenance cost is reduced The combination of copper, rubber, synthetics, plastics, to a minimum by the absence and textile fabrics, with vision, technical ability, and a wealth of experience, provides industry with insulated o f wear and tear. Conductors of outstanding merit. No matter what your Free-standing and ‘Built- need, STERLING can fill i, - efficiently. And if you ‘ ’ require a specially prepared cable for an unusual in ’ Models will be available. purpose we can help you also. Write to-day for full information and samples and prices of the cable that interests you NOW. By Appointment By Appointment Refrigerator Suction Cleaner M akers and Refrigerator M anufacturers QUALITY ELECTROLUX LTD . LUTON - BEDS Head Office : 153/5 Regent St., London, W.1 A Iso Manufacturers o f the fa m o u s Electrolux STERLING C A B L E CO. LTD. QUEENSWAY Suction Cleaner En f ie l d m id d x . TEL. : HOWARD 26IJ royds 100 (Supplement) E l e c t r i c a l R e v ie w August 9, 1946 Various types of Plastic Cabfes and Tubing available for a!! purposes. Enquiries for essential work only.______ STOVE PANELS AND ELEMENT STRIPS BRITISH MICA C° LTD • BED FO R D SPECIAL BITE AND GRIP INTO TUBE OR ARMOURING Note the tongue which ensures perfect and permanent contact. Easy to fix. N u ts cannot turn. All sizes from half to two inches. LIGHTING STANDARDS THE DONOVAN ELECTRICAL CO. ? end for Catalogue E R / 2 2 0 .BIRMINGHAM 9. LTD. n I T D TTBURN R? £ R 0 I N G I 0 N HOLES L_ BIRMINGHAM 24 August 9, 1946 E l e c t r ic a l R e v ie w (.Supplement) 101 SERVICE T 0 HUMANITY Service to In dust r HOT BRASS STAMPINGS personal attention to individual require There are distinct advantages in ments, large or small, backed by a the use of hot brass stampings most comprehensive range of Electrical compared with rough sand castings. equipment and accessories produced in Sometimes machining is elimi our several Works. These, over many nated entirely by the employment years, have made the name of FALKS of McKechnie stamped parts. synonymous with SERVICE. Our con This may be a reason why “ the stant aim is to maintain and extend other people ” sometimes seem to that reputation. be producing quicker, cheaper and even better than you had thought possible. FALKS MCKechnie LIGHTING FITTINGS BROS. LTD. ★ ROTTON PARK ST., BIRMINGHAM, 16 “ HITEST” CABLES 'Phone: Edgbaston 3581 (7 lines) ★ “ EFESCA” ACCESSORIES Branches : London — 62, Brook Street, VV.l. ’Phone: M ayfair 6182/3/4. Leeds ★ — Prudential Buildings, Park Row. “ COOLEX” SWITCHGEAR ’P hone: Le,eds 23044. M an ch ester — 509-513, Corn Exchange Buildings, 4. 1 ★ 'Phone : Blackfriars 5094. N ew ca stle- “ CLIMAX” CONDUIT on -T yn e— 90, Pilgrim Street. ’Phone: ★ Newcastle 22718. “ RAYDEX” COOKING, HEATING & DOMESTIC APPLIANCES FALK STADELMANN & CO. LTD., 91, FARRINGDON ROAD, LONDON, E.C.1______HOL. 7654 ® 89-102 102 {Supplement) E l e c t r i c a l R e v ie w August 9, 1946 >AVIS &TIMMINS I? § Head Office: BILLET ROAD - WALTHAMSTOW - LONDON E.I7 T EL E P H O N E L A R K S W O O D 2313 NEW DUAL TESTOSCOPE BAKELITE MOULDINGS Ideal for High and ERINOID Low Voltage TURNINGS Testing ; 1/30 SPECIFICATION 100/850 A.C. and D.C. FREDERICK W. EVANS LTD. Allowance made on old models. Send for PLASTIC WORKS interesting leaflet (Q 4) on Electrical and L O N G ACRE, BIRMINGHAM 7 Radio Testing, from all Dealers or direct. RUN BAKEN ■MANCHES TER•/ TELEPHONE EASt 128« 4 1287 LONDEX ^ RELAYS RELAY LQA approved by the G. P. O. L O N D E X * L T MANUFACTURERS OF k .LAYS a ^ rplkesy 207 AN ERIEY «0AD- 1 0 N D 0 N S E Z 0 svo,:~ y B POLITECHNIKI i iii August 9, 1946 E l e c t r ic a l R e v ie w THE LIGHTWEIGHT INSULATOR An ideal material that can be specified with confidence for any job requiring an insulator combining mechanical strength with high dielectrical properties. Manufactured to B.S.S. 972, 668 and 1137, etc. Our technical staff can help you with your problems SPICERS LTD. 19 NEW BRIDGE STREET, LONDON, E.C.4. CENTRAL 4211 Ext._____ There's no corrosion ot the connections in the Solon Electric Soldering Iron. Tucked neatly away at the end of the handle, the heat can’t get at them I Efficient rub^er sleeve cord grip prevents sharp bending of the flexible. The heating element is inside the copper bit-giving constant heat; no waste of current ; features that make Solon soldering quicker, cleaner, safer. All Solon irons are supplied with 6 ft. of H enley 3-core flexible. Made for the following standard voltages- 200 220, 230. 250 Illustration shows standard 240 -watt model. Other types and sizes for various specialised jobs. SOLQh SOLDERING IRON for INDUSTRIAL USE Made in England W. T. HENLEY’S TELEGRAPH WORKS CO. LTD. Engineering Dept. 51-53 Hatton Garden, London. E.C.I______The capital Siyma9 in mathemalics9 is a symbol meaniny 66 the sum of 99 PHILIPS The Philips emblem. in everyday life, is a symbol meaniny the sum of expert desiyn9 skilled workmanship and yood materials PHILIPS LAMPS ★ RADIO ★ X-RAY COMMUNICATIONS EQUIPMENT AND ALLIED ELECTRICAL PRODUCTS PHILIPS LAMPS LTD • CENTURY HOUSE • SHAFTESBURY AVENUE ■ LONDON • W.C.2 ( 12 7 D) Printed in Great Britain at T h e C h a p e l R i v e r P r e s s , Andover, Hants, and published by E l e c t r ic a l R e v i e w , L i m i t e d , at Dorset House, Stamford Street, London, S.E.l.