'HE TECHNICAL NEWSPAPER OF THE ELECTRICAL INDUSTRY EiSPBIC POWER DISTRIBUTION & ^ transmission •ft Kno«m and used thoughout the world, TELCON Power Cables arc made to British Standards and customers’ speci­ fications and suitable for all voltages up to 22 KV. Further details and quota­ tions supplied on request. THE TELEGRAPH CONSTRUCTION & MAINTENANCE CO. LTD. founded ÎS64 Head Office: 22. OLD BROAD STREET, LONDON. E.C.2. Telephone ; LONdon Waft 3141 All enquiries io: TELCON WORKS, GREENWICH. S.E.IO. Telephon*: GREenwich 1040 25 A P R IL , 1947 SIXPENCE In this Garage as in any other, small metal pressings play an important part in assisting the smooth running and functioning of not only the cars themselves, but the business too. The Petrol Pump can emit at a moment’s notice just the quantity of petrol required, no more, no less, thanks to the intricate working of its mechanism in which stampings and pressings are important items. Battery Chargers hold many secrets behind that mysterious black switchboard, the air pump owes a great part of its efficiency to metal pressings, and the automobiles themselves, whether lorry, light- car or limousine, carry innumerable odd shapes in metal brackets and gadgets without which the vehicle as a whole would be far from complete. The automobile Industry is but one of a hundred others to which the products of W right, Bindley & Gcll, Ltd., make an important contribution. Although old customers are naturally having preference at a time like this, W.B.G. are always pleased to make new friends. t h e electrician 25 APRIL, 1947 1041 WE REGRET OUR INABILITY TO KEEP OUR FRIENDS FULLY SUPPLIED WITH <§> SWITCH AND DISTRIBUTION GEAR WE HOPE TO MORE THAN SATISFY EXISTING DEMANDS WHEN THE CERAMIC POSITION IMPROVES IN THE MEANTIME PLEASE REMEMBER THAT WE ARE DOING OUR BEST UNDER DIFFICULT CONDITIONS BILL SWITCHGEAR LTD MANCHESTER ASTON LANE, PERRY BARR LO N DON . GLASGOW. H.H.POLLARD. BELFAST. flRAMHALL BIRMINGHAM-2 0 BURTON-ON-TRENT phone:birchfields son. cp4M $:'b il5witch'.bham. 2$ APRIL ig A The FINISHING TOUCH the ELECTRICAL INDUSTRY ★ A First Class Product R a n g e r deserves a First Class Mark ■ S ä y ° L T A GE “ Trapinex ” Paint Transfers provide the modern method of marking first class % NJ » ' T c h products in brilliant effect, truly worthy of the greatest names in industry. That why the manufacturers of electrical equipment featured here and many other leaders in all industries pin their faith to t t a w t h i u s “ Trapinex” Paint Transfers, for capi­ talising their goodwill throughout the world. “ Trapinex” Paint Transfers are printed with special paint of colours many times brighter than printers’ ink. Any number :-'fVER' I t Ä of colours may be printed and applied to any smooth surface, in striking design or cut out effect without film or paper background to mar the distinctive dis­ ^EVERY INDUSTRY has a thousand play—Brilliant, Durable, Weatherproof, uses for “ Trapinex” Paint Transfers and so easy to apply. (additional to the more obvious uses for A D V IC E freely given, but when you write for publicity, display and packaging) in Work­ prices please state: (1) Size, (2) Quantity, shop, Factory, Office, for Nameplates, (3) Number of Colours, (4) Purpose, (5) Word­ Brand Marks, Monograms, Patent Num­ ing required, (6) A rough sketch would help. bers, Instructions, Diagrams, Wiring Lay­ WE HAVE NO STOCK LINES OR PRICE outs, Warnings ; Type, Catalogue or Serial LISTS. Numbers. Trapinex (Regd.) Paint Transfers artfully patented and manufactured only by TRAPINEX LTD., 19, COMMERCE WORKS, HIGH ROAD (Opposite Town Hall), W pO D GREEN, N.22 'Phone-. Botoes Park 6 S I 1 'Grams'. ‘Trapinex, Wood, London' Cables-- Trapinex, London THE ELECTRICIAN 25 APRIL 1947 1043 MEM production has already gone ahead by leaps and bounds. Take the 124K splitter, for instance. During the last six months production has increased fivefold. With other lines, too, we are going all out to catch up with the heavy demand both for housing and for indus­ trial purposes. But demand is still greater than supply, so that MEM goods are still hard to come by. To make sure you get a fair share of available sup­ plies, it is still the best plan to keep in touch with your wholesaler. Midland Electric Manufacturing Co. Ltd., Birmingham, 11 ■ Branches in London & Manchester 25 APRIL 1947 THE ELECTRICIAN Wires, from thickest to medium gauge, are drawn in one operation on all British high speed ma­ chines using Tungsten Carbide and Diamond dies, giving perfect finish and gauge to meet the most r h s y m o m * exacting specifications re­ quired to-day. 47, V ic t o r ia Street, Westminster, London, S.W .I Telephone : Abbey 2771 (Pee. Br. Ex.) Works ; Enfield, Middlesex DS Cooker Control Unit compact yet efficient switch and plug unit. It includes a 30-A double-nole switch for the cooker and the famous DS Fused Plug and Socket for the kettle. Conduit Holes are provided at top and bottom for cable entry but may be provided elsewhere to special requirements. Announcement of D.S. Plugs Ltd., Manchester, London,Clasgow. £ 1046 THE ELECTRICIAN 25 APRIL 1947 1045 Fully descriptive £ illustrated D ala Sheet (I• starnpj f t o m NOM M AN EH GINBERING CO. LTD. W arw ick. Telephone, W arwick 448 hartrick I i € H TW E iC H T A l f t - C O O I § Cogent N. S04 2$ APRIL 1947 THE ELECTRICIAN 1046 OURACABIES S ó t ik a u ñ M - ít e S i g a i tytudUcvltfh, M i e r n i * * 'jtlie ru L T h e L a t h e t h a t can even turn a h a i r ! PULTRA MICRO LATHES Mirro Photo are specially designed for of hair actual­ ly turned on a the efficient and accurate P ultra lathe production of all small work. Accessories available for milling, grinding, etc. W r i t e for Catalogue CPA Photograph by courtesy of Miles-Martin Pen Co. Ltd. THE ELECTRICIAN 25 A P R IL 1947 1047 B FRACTIONAL HORSEPOWER MOTORS The m ost popular in the country LOW- SPEED MOTOR UNITS A complete range for any standard vo ltage A.C. or D.C. Spur-geared | H.P. Low-speed Motor Unit with co-axial shaft for speeds down to 22 r.p.m. Designed and built as • • a unit incorporating an electric motor and speed reducing gear. BTH products include all kinds of electric plant and equipment; S P U R OR Mazda lamps and Mazdalux W O R M G E A R S lighting equipment. BTH RUGBY THE BRITISH.THOMSON-HOUSTON COMPANY LIMITED. RUCBY. ENGLAND./ A5729 25 APRIL 7947 THE ELECTRICIAN 1048 • Dimensions only 7 x t>Zi" X 4 • Power Lighting and Heating '■ under one roof.” • Saving In wiring cost and space. • Each row of fuses a separate unit. O Each fuse In Its own compartment. • Conforms to1 2 sizes— 4 way 6 way. 30 A. max. cap. Write for F.C. Announcement of Dorman & Smith Ltd., Manchester, London, Glasgow. El F 46 THE ELECTRICIAN 2S APRIL 1947 1049 Go o d A ll R o u n d A TYPICAL UNIT PANEL WITH LIGHTING TRANSFORMER AND CONTACTOR ON BUSBAR CHAMBER REYROLLE HEBBURN-ON-TYNE 25 APRIL 1947 THE ELECTRICIAN Barries Electrical Agencies, Ltd ................................... 1053 British Cork Mills, Ltd .................................................. 1075 British Rototherm Co., Ltd. ................................ 1066 Bill Switchgear, Ltd. ... ... ... ... i 041 Birmingham Products, Ltd. !” 1062 EARTH FAULT British Industries Fair .............................................. 1067 British Mica Co., Ltd ......................................... 1106 British Thomson Houston Co., Ltd ................................. 1047 Buck & Hickman, Ltd. ... ... ... 1063 INDICATION Bushing Co., Ltd., The .................. 1053 Cables & Plastics, Ltd. ... ... ... ... i062 Charlton Electric Appliances, Ltd. ... ... 1106 Churchill, H. & D., Ltd. ... ... ... ... 1061 Clarke, H., & Co., Ltd ! 1107 Clifford, Chas., & Son, Ltd. ... ... ... 1106 Cork Manufacturing Co., Ltd ... 1071 Corncrcroft, Ltd .............................................................. 1064 Crane, Walter, Ltd. .............................................. 1066 Cryselco, Ltd ............................................................................ 1055 Dorman & Smith, Ltd ...........................................................1048 D.S.Plugs, Ltd ......................................................................... 1044 Duratube & Wire, Ltd ...........................................................1046 Electrical & General Accessories (Leicester) L.t(*- 0— . 1108 Electricity Services, L td .................................................. 1066 Electrolux, Ltd .........................................................................1101 Enfield Cables, Ltd. .............................................. 1072 Enthoven, H. J., & Sons, Ltd ........................................ 1108 Ericsson Telephones, Ltd. ................................ 1048 Everett Edgcumbc & Co., Ltd ............................................1050 Fluorescent Spares..................................................................1066 Frys Metal Foundries, Ltd. ................................ 1065 General Electric Co., Ltd ............................................... 1 105 Gibson Todd & Co., Ltd ................................................ 1058 Gleco., Ltd. 1052 Hampton Works, Ltd. ... ■................................ 1060 Hurlock, Wm., Jnr., Ltd ................................................. 1056 E v e r e tt Jones, S am uel, & C o., L td . ................................ 1 106 Kent, Wm., (Porcelains), Ltd. ... 1064 E«lgeii3iibe Langley London, Ltd .............................................................1099 Litholite Insulators & St. Albans Mouldings, Colindale