Laurence, Scott & Electromotors Ltd
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PBnni irTIOKI DAD^TFR aVn-S’ variable speed A. C. motor, 1450/480 rl\U U U U I IW IN D U U JI Cl\ POUTECHi 'R'P-M- driyinZ Shards Horizontal Borer. It is a fact that in numerous instances the application of an ‘ N.S. ’ variable speed A.C. motor, by enabling the speed to be adjusted instantly and exactly to the best value, has greatly improved the performance of machines of many kinds, as discerning designers and users are quick to appreciate. LAURENCE, SCOTT & ELECTROMOTORS LTD. Electrical Engineers since 1883 NORWICH & MANCHESTER E l e c t r ic a l R e v ie w January 26, 1945 The reliability of the generating plant is the same as that of its dis tributive cable. And the reliability of the cable is that of its insulation! That is why leading cable manufacturers use Tullis R u s s e ll Rothmill Cable Insulating Papers. Rothmill is renowned for its uniformly highquality.and isguaranteed free from metals and grit. R o t h iiiill A complete range is manu CABLE INSULATING PAPERfactured. W rite for details. T u llii ‘i& vn ell rC o Jix d The Pioneers of Twin-wire Papers for Printers AUCHMUTY & ROTHES PAPER MILLS, MARKINCH, SCOTLAND LONDON MANCHESTER BIRMINGHAM I Tudor Street, E.C.4 372 Corn Exchange Bldgs., 116 Colmore Row Corporation Street ____________ ________________________ January 26, 1945 E l e c t r ic a l R e v ie w I T h is new “ Sieray ” fluorescent lamp is identical with the standard Siemens “ Sieray ” D aylight fluorescent lamp, except that it gives a white, warmer, and more pleasing light» co mparable to Sunlight, and possesses the same qualities cf High Efficiency and Coolness in operation. The two lamps are electrically interchangeable so that existing installations of Daylight Lamps can be changed over to Warm White without difficulty. The importance of planned lighting in essential Industrial Plants cannot be over emphasized. Siemens lighting engineers are at your service, without obligation: You are invited to send for descriptive leaflet. SiÉM ÈR S SIEMENS ELECTRIC LAMPS AND SUPPLIES LIMITED 38/9 U p p e r T h a m e s S t., L o n d o n , E .C .4 BRANCHES: BELFAST, BIRMINGHAM, BRISTOL, CARDIFF, DUBLIN, GLASGOW, LEEDS LIVERPOOL, MANCHESTER, NEWCASTLE-ON-TYNE, NOTTINGHAM, SHEFFIELD. 2 E l e c t r ic a l R e v ie w January 26, 1945 Woman's Work in W ar-Tim e TheB.K.CS-, It's a grand job of work she’s doing—in unusual surroundings. If, and when, the time comes to set up home she’ll deserve everything that makes life easier— including a Burco, of course. Boilers can be sup plied for domestic laundering purpo ses against Board of Trade Licences. B U R C O L T D . ROSE GROVE, BURNLEY ELECTRIC WASH BOILERS MOTORS BUXTON CERTIFIED Illustration jhows a typical flameproof squirrel cage induction motor fitted with B E SA plug & socket & I P C. adaptor. IS B H P 3-phose SO cycle 600 volt 975 r.p m. • • • • Unvarying reliability and efficient performance in con tinuous service are watchwords in the drive for increased production to meet the needs of war. Peebles Flameproof Motors are playing an important part in the battle for fuel in a great number of mines, and are maintaining a high standard of reliability and efficiency under the most exacting conditions. BUILT FOR RELIABILITY DESIGNED FOR EFFICIENCY BRUCE PEEBLES &. CO. LTD., ENGINEERS. EDINBURGH. 3628 January 26, 1945 E l e c t r ic a l R eview 3 MAIN CONTROL SWITCHES for all factories / - & k l l "English Electric" /Oil \ /m % 0k J1 H.R.C Cartridges. Made For 30,60,100.160,200,300 & 500 Amps., 600 Vo I Is; Double, Triple and Four pole and culTh neufral links. Firred for Conduir. busbar chamber & c i ¿ y W iring , m inim um m m ntm anfs LONDON: A W ZELLEY MANCHESTER 6L ASGOIV- 7 3 , GREAT P E TER ST., BEL FAST■ BURTON-ON-TRENT WESTMINSTER'S.W.I BILL SWITCHGEAR LTD EXETER-SOUTHAMPTON BIRMINGHAM-20 BIRCH FIELDS • SOU ( 4 LINES) 'a 1C Ho" B / R M / N G H A M The letters D.P. originally stood for " Dujardin- Plante’’-- the name by which the battery was known when it was first produced in this country Nowadays, in the minds of battery users everywhere, D.P. KATHANODE stands for all that is best in battery Design and Performance. FOR ELECTRIC TRACTION D R BATTERY C° I™ STORAGE BATTERY BAKEWELL, DERBYSHIRE .... Phone : &AKEWELL 81-82 FOR ALL OTHER London Office : 50 G R O S V E N O R G A R D E N S , S .W . I Phone : S L O A N E 6255-6 PURPOSES J 149 Electrical Review J a n u a ry 26, 1945 Januar y 26, 1945 E l e c t r ic a l R ev iew 5 FLAMEPROOF CONTACTOR STARTERS DIRECT-ON-LINE for motors up to lO Horsepower at 400/550 volts. STARTER, with mechanically and electrically interlocked isolator, for motors up to 10 Horsepower. Cover cannot be removed STARTER (without Isolator) unless isolator is open. for motors up to 7; Horsepower. I s o l a t o r :— In separate flameproof chamber. Flameproof Reoersing Starters up to Starter can be examined with 6 Horsepower at 400/550 volts. isolator open in perfect safety, and complies with Coal Mines Flameproof Star-delta Starters up to Draft Regulation I4(iii). 15 Horsepower at 400/550 volts. Conform to BSS.229/1940 BTH RUGBY T H E BRITISH T H O M S O N - H O U S T O N COMPANY LIMITED. RUGBY, ENGLAND 6 E l e c t r ic a l R e v ie w January 26, 19^5 RAWLPLUG FIXING DEVICES Solve all your Fixing Problems --------------------- RAWLPLUGS RAWLBOLTS There is a R A W L P L U G The use of R A W L for every size of screw BO LT S requires the and coach screw, from minimum of time, the tiny No. 3 for light labour and tools. No wiring to the large grouting is needed. No No. 28 which will with time-lag waiting for stand a direct pull of cement to dry. Made over 4 tons. Rawlplug fixing is safer, quicker in tw o types— bolt and neater than any other method. projecting and loose bolt ty p e —they solve every bolt-fixing problem. Available with pipe clips, round and square RAWLPLUG hooks and eye bolts. Size £ in. to fin . diameter. METALPLUGS Standard Whitworth thread. (Screw Anchors) BOLT ANCHORS Specially suited for use w here the plug The RAWLPLUG BOLT is likely to be sub A N C H O R is especially jected to extreme designed for fixings of a climatic conditions. specialised nature. Un Made in sizes to take affected by atmospheric screws from No. 8 conditions it can be to No. 14 and lengths from I in. to 2 in. fixed below water if Designed with flange for hollow brick work necessary. Full range of and to stop plug being inserted too far in hole. sizes available and the anchors will take bolts from f in. to If in. diameter. WHITE TOGGLE BOLTS Toggle Bolts providean BRONZE PLUGS ideal means of making Specially designed for secure fixings to hollow outdoor jobs where a partition walls or ceil metal plug is specified ings, i.e. lath and or preferred. One plaster, asbestos board, end of the plug is etc., as they distribute “ coned ” to facilitate the strain over a wide the entrance of the screw when it is first inserted. B3II WRITE FOR TECHNICAL LITERATURE TO: T H E RAWLPLUG CO., LTD., LONDON, S.W.7 January 26, 1945 E l e c t r ic a l R e v ie w 7 t l U G f f d g 0 o d J k h U n ^ The clear and shadowless lighting of the machine shop illustrated is provided by COSM OS LAM PS— the height of perfection in industrial lighting. METROVICKS ‘LIGHT' PRODUCT COSMOS METROVICK LAMPS METROPOLITAN-VICKERS ELECTRICAL COMPANY LTD NUMBER ONE MNGSWAY. • • ; . LONDON. W.C.2. ■ Electrical Review January 2 6, 1945 . ¿7 U N 1924 Bullers made the first big bushing of 66 kV capacity. T o -d ay w e a re ab le to show th is m assiv e 242 kV OIL FILLED BUSHING. The porcelain parts were made in Bullers’ works for the British Thomson- Houston Co. Ltd. It measures 15 ft. 1 1 inches overall and is one of the largest bushings of this kind yet produced. Only the skill an'd knowledge acquired by long experience could produce insulators of such dimensions free from flaws. How much larger will be called for in years to come, only the future can say. But one thing is certain, whatever the size, Bullers will be ready with their unrivalled resources and experience to cope with the problem. Bullers IN SU LA TO R S A N D IRONWORK BULLERS, LTD. t h e h a l l , o a t l a n d s d r i v e WEYBRIDGE, SURREY Telephone : Walton-on-Thames 2451 Manchester Office : 196 Deanscat«, Manchester January 26, 1945 E l e c t r ic a l R e v ie w 9 Sri atih, «SU DKG. uitii »Ml. esijft :ol4i «1 ¡s i is iwae oi saj si Id: icaa mi/.