Review Ol, Cxxxix
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ELECTRICAL REVIEW OL, CXXXIX, Roof Cranes at Gladstone Dock, Liverpool MOTORS FOR CRANES L.S.E. make A.C. and D.C. motors and control gear with the right electrical and mechanical characteristics for cranes of all kinds, lifts, conveyors, dock gates and similar drives. Special systems are available for extremely wide speed ranges if required. LAURENCE, SCOTT & ELECTROMOTORS LTD. NORWICH, MANCHESTER, LONDON AND BRANCHES 11 E lectrical R eview November 29, 1946 A N E W and comprehensive List of SLIDING RESISTANCES and D IM M E R S is now available on application THERE HE STANDS—symbol of authority in an orderly World — controlling — directing — obeyed because absolutely trustworthy and reliable. What a fitting com parison with BIRCH RESISTANCES, Arms of the Ohm’s Law. Backed by many years of practical experience in which their reliability has been tested under all conditions, BIRCH RESISTANCES, in their various applications, stand up to their job and can always be depended upon to provide specified service because of their first-class workmanship. Please call upon us to help you solve any Resistance Resistancesproblem. May we quote you for f i d M S o f any of the fo llow in g DIMMERS — REGULATORS (Field, Shunt, Voltage) — RESISTANCES (Arc Lamp, Charging, Regulating, Sliding) — RHEOSTATS — ELEM EN T S and SPIR A LS. ASBESTOS WOVEN RESISTANCE NETS AND GRIDS H. A. BIRCH & CO. LTD., Wilohm Works. Wood Street, WILLENHALL, STAFFS. Telegrams: •'w i l o h m ” Willenhall. Telephone: Willenhall 494-495 E lectrical R eview H O S ^ e a * t As a Plumber, a great part of my work is the fitting and connecting-up of Electric Water Heaters. Being short of labour, you can imagine my delight every time when it’s a “ Heatrae ” because of the ease in fitting and time saved in connecting-up. Somebody at Heatrae seems to have fore seen Plumbers’ present troubles, to say nothing of preventing any subsequent trouble with Waterworks Engineers. leaders in electric water heaters HEATRAE LTD., NORWICH « GRAMS : HEATRAE, NORWICH • PHONE : HEATRAE 25131 IS IT ALIVE? THE “ FACILE" THE “ PARTRIDGE ” TERMINAL Send for Prices P R E S S U R E and List of all DETECTOR k i n d s o f (Regd. T.M. No. B.581955) Term inals will inïallibly tell’you, giving visible and audible indication ROSS COURTNEY (No earth connection required) ASHBROOK ROAD, LONDON, N.I9 Range Length Type up to of handle Volts C 36" 1 1,000 E 60,000 84" F 15,000 48" . H 1 1,000 36" QQOT Ï3H33W2 L 33,000 72" Also makers of “ Westmins ter” Vacuum Tube Detector and H.T. Earthing Rods .Patent JNo. oiyyiy The WESTMINSTER ENG. Co. Ltd. |MC Land REPETITION LT? Victoria Rodd, Willesden Junction, N.W.IO I POOL LANE LANCLEY BIRMINGHAM Telephone: Telegrams: Elgar 7372 (2 lines) ‘ Regency, Phone, London.' A Electrical Review November 29, 1946 For Power Distribution Schemes and Industrial Applications including:— Indoor and Outdoor Sub- ■I- 15000 K.V.A. 132,000/11.000 volt 50 cycle 3-phase O.N. Outdoor Station and Pole Mounting Transformer with "On Load" Units, On-Load Voltage tap-changmg gear in service on Regulating Equipments, the British Grid. Testing Transformers, Reactors, Extinction Coils, Welding, Furnace, and Mining Transformers. 15 K.V.A. 33.000/500-250 volt 50 cycle »ingle-phake Pole Mounting Transformer. 250 K.V.A. 11,000/400 volt The thousands of Peebles 50 cycle 3-phase Indoor Transformer fitted with Transformers in successful “ Off load" tapping switch. operation to-day consti tute a reliable guide in selecting transformers to meet the demands of to-morrow. 75 K.V.A. 3.300/450 voit 50 cycle 3-phas© Transformer Sub-sutton for use in mines. PROVED IN PRACTICE ALL OVER th e WORLD BRUCE PEEBLES & CO. LTD., ENGINEERS, EDINBURGH. November 29, 1946 E lectrical R eview 3 4 E lectric a l R eview November 29, 1946 CM i / A t / i e (D o n ifi/im s’/U j COPPER A telegram for you? That means copper has been at work—to bring good news, we hope. You've just made a telephone call7 Copper again! Heard a good radio programme last night ? Sent a cable to Australia ? Copper helped you every time, for the miracles of modern communications are built on copper. FROM telegraphs to television, communications offer a vast field of usefulness for copper but it is only one of many. Copper has a way of doing so many jobs better. Engineers, architects, master-mariners, horticulturalists, and many more, all know and value the special properties of copper. If high resistance to corrosion, high thermal and electrical conductivity, toughness combined with ease of fabrication—if any of these ‘ plusses ’ can serve your needs, it will pay you to get the latest data about the use of copper and its alloys in your field. The Copper Development Association will gladly provide it. LET COPPER CO-OPERATE COPFEH DEVELOPMENT ASSOCIATION. A non-trading organisation, maintained 6y the British Copper Industry to supply publications, information and advice, free, to all users of copper. Grand Buildings, Trafalgar Sijunre, London, W.C.2 Enquiries to RENDAIS HAH, lUtllFTT. HFI1TS. RAOIETT Sfilfi lectrical eview 5 November 29, 1946 E R SWITCHGEAR OIL-BREAK • AIR-BREAK • AIR-BLAST Each unit has a self-contained circuit-breaker carriage and tank lift. C L A S S Q A (Metal-enclosed) UP TO 11 kV., 150 MVA.„ incorporating VERTICAL-PLUGGING OIL CIRCUIT-BREAKERS FULLY TESTED FOR SHORT-CIRCUIT DUTY BTH RUGBY 6 Electrical Review November 29, 1946 THE BRUSH ELECTRICAL ENGINEERING CO. LTD. W rite for PuHications N?242&243 Loughborough, England. TURBO GENERATORS, TRANSFORMERS, E.H.T. and M.T. SW ITCHGEAR, A C. and D C. MOTORS and GENERATORS, BATTERY ELECTRIC VEHICLES and TRUCKS. TRACTION EQUIPMENT, BUS and COACH BODIES BRAN CH ES London, Birmingham, Cardiff, Bath, Manchester, Leeds Newcastle, Glasgow, Belfast, Dublin. November 29, 1946 Electrical Review Big holes . medium holes ... or “baby” holes . from 1 inch down to | of an inch ... it’s child’s play with <|> Universal Electric Drills. Every bearing a ball bear ing mounted in steel inserts—heat treated helical gears — perfect balance for fatigue-free handling —these are but a few of the features which have made <p Universal drills pre-eminent as real produc tion tools. More than forty years of experience is built into all <p Universal Electric Tools—they are ready to meet your needs efficiently and economically. f ( 6 NSALIDAT6lfpNEVMATIC • Tfl fl L (Gp) CO. LTD. AIR COMPRESSORS ' PNEUMATIC TOOLS • ELECTRIC TOOLS VACUUM PUMPS OIL WELL TOOLS ROCK DRILLS DIESEL ENGINES DIAMOND DRILLS ’ CONTRACTORS' EQUIPMENT 8 E lectrical R eview November 29, t946 THE BEST WORK DEMANDS THE H a w k in s B E S T L IG H T APPLIANCES AND LIGHTING EQUIPMENT Here are examples of what quantity produc tion and new manufac turing methods achieve for the famous Hawkins Supreme Products. N e w Aluminium K ettle, 4 pint— 1250 watt immersion ele ment. Cat. No. LG H 700. Hair Dryer, known the world over. Cat. THE D & G No. LG H 95722. New Electric Reflec GIRDER tor Fire, 1000 watt- adjustable. Cat. No. FITTINGS LG H 113. New Clip-on Bed # Gives Concentration of Light on Light with switch con the JOB. trol-attractive ivory finish with red or green # Shielded from operator’s eyes. candle. Cat. No. LGH # Horizontal or Vertical Mounting. 318. # Single, Double or Three Arm Mirror Halo Bowl Extension. Pendant, 18* diameter. # Illustrated Catalogue sent on Cat. No. LGH 269285. request. New Electric Fan, adjustable for desk, DRAKE & GORHAM table or wall bracket WHOLESALE LTD. — guard and blades beautifully finished in 77 LONG ACRE, LONDON, W.C.2 cream with the stand Telephone : TEMple Bar 3993 in either red or green. M ANCHESTER-29 Piccadilly. Cat. No. LGH 920. BR IG H T O N - 2 4 Marlborough Place. GLASGOW-182 St. Vincent Street. Prices on application BRISTOL—2 & 4 Church Street, Temple. I D U BLIN — 2 Church Lane, College Green. L. G. HAWKINS & CO. L T D ., 30/35 D rury Lane, Midland Representative : L o n d o n , W .C.2 . Telephone W. T. BOWER, 184 Jockey Road, Sutton Coldfield Temple Bar 5 8 11. November 29, 1946 E lectrical R eview m i COUPLING BOXES for unit assembly of all cable coupling combinations B.I. Callender's Mining Type Coupling Boxes provide a means of making the cable system as readily transportable as the operating machinery. Extensions, withdrawals and repairs can be effected with minimum expenditure of time and material. Colliery electrical systems can be standard ised in regard to cable lengths and sizes, with complete interchangeability of components. Jointing can, if desired, be carried out on the surface, under best possible conditions. For working pressures up to and including 3,300v. WRITE fOR FULL / «-0.T. MINES DEPARTMENT PARTICULARS and QUOTE. \ t l U ) CERTIFICATES No> 698. 699, REFERENCE NAM.10. \ | / 698/1, 699//, 698/2. BRITISH INSULATED CALLENDER’S CABLES LIMITED NORFOLK HOUSE, NORFOLK STREET, LONDON W.C.2 10 E lectrical R eview November 29, 1996 CONDUIT I’OR UNDERGROUND CABLES EXTREMELY EASY TO LAY, NO PROJECTION AT JOINTS, LONG LENGTHS, FEW JOINTS, PERFECT ALIGNMENT. Write for details and specification. 4KEY QUEEN VICTORIAENGINEERING ST., CO.TRAFFORD LTD. PARK, LONDON, E.C.4. MANCHESTER Tel. : City 2235 Tet. : Trafford Park 1903 ELECTRIC MOTORS Although industry is rapidly returning to normal production such is the demand for DELCO Electric Motors that our fast expanding output is still insufficient to meet the requirements of our friends.