,VOL. `Y Registered 4t the G.P.O.!de teansmissvon to Canada by Canadian Magazine Post, NO. 46 THE WORLD PRICE JANY 6P '2E1 1917 How to Become This Magaz ne can be sent a Wireless Operator free to our troops abrcad the by leaving it How to Learn at a Post Office Morse. Code The Telephone Receiver - ri THE WIRELESS WORLD-Advertisements f J.tu_tRN-, SULLIVAN INSTRUMENTS Sullivan "Universal' Galvanometers and Shunts for Land and Sea Use. SULLIVAN TELEPHONE RECEIVERS. Fast Speed Wheatstone Automatic Transmitters and Receivers, guaran- teed at 400 words per minute, and Wheatstone Apparatus generally. Precision and Standard Measuring Equipments for D.C. and A.C. (high frequency) determinations, Condensers of Low Power Factor, etc. H. W. WINCHESTER HOUSE, LONDON, E.C., ENGLAND. SULLIVAN Works LIVERPOOL HOUSE, MIDDLESEX ST., LONDON, E.C. Office : 3518 London Wall. Telegrams ; " Deadbeat, London," Telephone Works: 3518a Silk and Cotton Covered H.C. Copper Wire, Resistance Wires, Fuse ll Binding Wires, Charcoal iron Core Wire, Asbestos ELL Wire Li %y C LERNW F.C.E.C. ROAD SONS` LONDON, O & Central. Bared 1743' 13259 and Twisted Wires, ORMISTErstobushed Copper Strand & Flesiblee of any Construction,Wire P London , Ormistnn Ropes & Cords, down to the finest sizes, in Galvanized Steel, Phosphor Bronze.etc. NORMAN, SMEE & DODWELL MANUFACTURERS OF HIGH-CLASS VARNISHES for Coach Builders and Decorators, Railway Carriage and Locomotive Builders, and Ship Builders Special Insulating Varnishes for Electrical Purposes Offices and Factory : MILES LANE, MITCHAM, SURREY. THE S.O.S. "LISTER-BRUSTON" Patent Automatic Electric Plant for Wireless Telegraphy or Electric Lighting The only Automatic ¡ Emergency Lighting Plant. MANY IMPORTANT SELF-STARTING FEATURES VARIOUS P0%5 RS SELF -TESTING FOR PRICES AND PARTICULARS APPLY TO R. A. LISTER & Ca., LTD., 47 VICTORIA STREET, LONDON, S.W. WORKS : B 2 Dept., DURSLEY, GLOS. Please mention "The Wireless World" when writing to Advertisers. e 1917] THE W1,FLESS WORLD-Advertisements tts DYNAMOS, MOTORS, MOTOR -GENERATORS, ROTARY CONVERTERS, BOOSTERS, and SWITCHGEAR. 125 Kw. Singlephase to D.C. Induction Motor -Generator, 575 r.p.m. THE ELECTRIC CONSTRUCTION CO., LTD. HEAD OFFICE : Dashwood House, 9, New Broad Street, LONDON, E.C. Works : Bushbury, WOLVERHAMPTON. Please mention " TL -c 117ireless World " when xr,einig lo 3dreritsars. A iv WORLD- Advertisements JANUARY, r THE WIRELESS LPUBLICATIONS of THE WIRELESS PRESS, LIMITED MARCONI HOUSE, STRAND, LONDON, W.C. t NOW READY The Wireless Telegraphists' The Year Book of Wireless Pocket Book of Notes, Telegraphy and Telephony Formule, and Calculations 1916 (FOURTH YEAR) By Dr. J. A. FLEMING, M.A., Ma ofiretess 1,000 Pages (Witinst, AVp Stations D.Sc., F.R.S., M.Inst.E.E., &c. Price 3/6 A valuable compendium for Wireless Kingdom Engineers and Operators. Postage C°niteddALroa 1/J LIMP LEATHER. 352 PAGES The Only Reference Work on this Subject 6/- NETT (POSTAGE 43.) Over 10,000 copies sold The The Handbook of Technical Elementary Principles Instruction for Wireless of Telegraphists Wireless Telegraphy By J. C. HAWKHEAD and H. M. DOWSETT Second Edition-Thoroughly Revised. Provi -es a complete Course for the Postmaster - By R. D. BANGAY General's Wireless Operators' Certificate. 344 pages. 240 diagrams and illustrations. 3/6 nett (Postage 4d.) See Announcement, Page xxii, Wireless Transmission Test Questions and Answers on Wireless Telegraphy of Photographs A series of test cards, based on the above and other well-known text books. Invaluable for By MARCUS J. MARTIN self-examination. A thoroughly interesting work for Amateurs Series I.-The Elementary Principles of Wireless Telegraphy. I/- nett (postage 2d.) and Experimenters I a.-Book of Model Answers. 1/- nett (postage 2d.) I1.- Electricity and Magnetism (Elementary and I I 7 pages. 62 diagrams and illustrations. Advanced)-Practical Questions on the use of apparatus, covering the ground for the 2/6 nett (Postage 5d.) P.M.G.'sExaminations. 1 /- nett (postage 2d.) Ila.-Book of Model Answers. (/-nett(post,g-2d.) " Morse Made Easy" " The Wireless World " A new card (linen backed) for rapidly learning the Morse Code. A Monthly Magazine devoted to The system enables the symbol for each letter Wireless Telegraphy & Telephony to be indelibly impressed on the memory so that Obtainable all Newsagents 6d.; or Post Free, 9d. there is no possibility of confusing one letter with another. Volume IIl Bound Copies 5/- Post Free Invaluable to everyone interested in signalling United Kingdom ; 6/- Abroad. Obtainable at all bookstalls and newsagents. Price 3d. Binding Cases for Volume III. 1 /3 Post Free. or post flee 3d. Index only, Post Free on receipt of 2 penny stamps. MORSE CODE CARD, showing Alphabet, MAP OF THE WORLD, 1916 Edition. Showing Numerals, Abbreviations, etc., at a glance, Price 2d. location of over 700 Wireless Stations. Price 1/8 post free. post free. WRITE FOR DETAILED CATALOGUE Please rnentio " 2 /ve Wireless World " when writing to .Advertisers. 1917] THE WIRELESS WORLD-Advertisements V "Magnet:.Manchester 7094 Central "Orders. Cannon. London. 5370 City h OPENSHAW Manchester, England. London. 49 Queen Victoria Street. E.0 STEAM DYNAMOS FOR WIRELE5S and SHIP LIGHTING Designed for continuous running at sea, having Admiralty pattern bearing, drain cocks, relief valves and centrifugal governor. ALSO- MOTOR GENERATORS AND PETROL DRIVEN DYNAMOS Please meal ern. "The Wireless IVòrld " when writing to Adverliser.s. vi THE WIRELESS WORLD-Advertisements [JANUARY, I9I7 FULLY - EQUIPPED WIRELESS OPERATORS are more in demand than ever, owing to THE BOOM IN SHIPBUILDING. The sound, practical correspondence course of tuition in WIRELESS TELEGRAPHY _!--a,.... .nllllp 'An"'.nlllpl' ^fllU" .flll ll' 111 Adapted to the requirements of Operators and Illo,.. Engineers of the Marconi Co., and to the Syllabus of the G.P.O. Technical Examination in Wireless Tele- graphy, and other qualifying certificates. Embraces the latest developments in this science and is continu- ally revised as research work reveals new methods. PAXMAN "ECONOMIC" Fees Moderate. Instruction the Best. Boilers are steam gene- See our List of Tutors. rators, which utilise . to Cheap fees mean cheap work, and effi- cient tuition in these subjects cannot be the utmost degree the secured by cheap payments. heat from the fuel burnt. For particulars apply : DIRECTOR, Dept. K, EMPIRE CORRESPONDENCE COLLEGE DAVEY, PAXMAN & CO., LTD. 104 Great Portland Street, LONDON, W. COLCHESTER, & 78 Queen Victoria St., E.C. TUDOR DRAWING OFFICE ACCUMULATORS EQUIPMENT HAVE BEEN SUPPLIED FOR WIRELESS TELEGRAPH WE INSTALLATIONS SUPPLY EVERYTHING THAT IS REQUIRED FOR THE IN DRAWING OFFICE. ALL PARTS of the WORLD AND ARE GIVING " COMPLETE SATISFACTION ORDOVERAX." UN DER TRUE -TO -SCALE PRINTS ARE PERFECT COPIES IN EVERY ALL CLIMATIC CONDITIONS DETAIL. ASK FOR SAMPLES. THE TUDOR ACCUMULATOR CO. LTD. B. J. HALL & CO., LTD. Offices : 'Works : Chalfont House, Great Peter Street, 3 Central Bldgs.,West- Dukinfield, minster, London, S.W. Nr. Manchester. WESTMINSTER. !';ease uteiNioa "7ke Wireless World ' .rlrcu ºvifdng lo Advertisers. TO ADVERTISERS. INDEX PAGE London Telegraph Training College. Ltd., The... xviii Aberdeen Line, The ... xvvii Allan Royal Mail Line ... Mackie & Co., W. ... ,,. ... Manchester Wireless College xviii American Line Co Ltd. 'taxi Atlantic College of Wireless & Cable Telegraphy Marconi International Marine Communication Telegraph -Cable Co. xxix Baker & Co.'s Stores, Ltd., Charles ... Marconi Wireless xiv Bennett College. Sheffield - Marconi Wireless Telegraph Co. of Canada, Ltd. ... Wireless Telegraph Co.. Ltd.... Britannia Rubber and Kamptulicon Co., Ltd. Marconi's ... British L. M. Ericsson Mfg. Co.. Ltd. ... .. Markt & Co. (London) Ltd. ... ... ... - xxi British and Foreign Sailors' Society ... xx British School of Telegraphy. Ltd., The ... ... .,. xv Marshall & Co., Percival ... ... ... 3 Cover Brown, James & Son ... ... xi Nalder Bros. & Thcmp'on, Ltd. ... ... P. xvi Pelapone Engine Co. ... Bryman, New . 2 Cover Callender's... ... ... .,. ,., ... 3 Cover Smee & Dodwell ... ... Ltd . ... ... ... saiii Canadian Pacific Railway ... ... ... .. .. xxix Norris. Henty & Gardners. xi Chloride Electrical Storage Cc.. Ltd.. The ... ... xxv North British & Mercantile Insurance Co Wireless Schools, Ltd. ... ... xvi City School of Wireless Telegraphy, Ltd xx North British The ... xi Commercial Union Assurance Co., Ltd. .. - North-Eastern Schoolsof Wireless Telegraphy, Compagnie Française Maritime et Coloniale de Northern Assurance Co.. Ltd. - xxix Elettro -Meccaniche Societa Anonima ... x Télégraphie sans Fil ... Officine ... xxviii Crompton & Co.. .., .,. Orient Line ... ... ... ... .. Ltd.... ... ... 2 Cover Cubitt Concrete Construction Co. ... .. Ormiston & Sons, P . ... ... ... ... xxviii Paul. Robert W.... .. .. ... ... ...xxxii Cunard Line .. ... xxix Davey, Pasman & Co., Ltd.... ... ... Peninsular & Oriental S.N. Co.. Ltd. Engineers' Journal, The .. Davis & Timmins. Ltd. ... ... ... Post Office Electrical xviii xx,x & Gold and Electrical Power Storage Co., Ltd. Donaldson Bros.. Ltd.... Pritchett ... xvii ... ... ... ... xiii & Co., Ltd., S.... ... ... Douglas Bros. ... ... Rentell ... xxvin vii Co . ... ... ... ... East London Wireless Telegraph College Royal Mail S.P. ... xxiv Economic Electric Ltd. ... viii Samuel Bros.. Ltd. ... ... ... ... ... .. ... ... ... ... xxv Electric Construction Cr Ltd., The ... ... .. iii Self & Son... xxviii ... xvii Savill & Albion Co.,