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5th AUGUST, 1922 THE PRICE 6D. NET. WIRELESS RLD AND RADIO REVIEW Registered at the G.P.O. VOL. X. No. 19. 5th AUGUST, 1922. as a Weekly Newspaper. The Name " BURNDEPT " GUARANTEES Cent. Per Cent. QUALITY & EFFICIENCY. BIRMINGHAMI MANCHESTER, ISE Haw S 61, Batocia S 0 LIVERPOOL: BURNDEPT LEEDS: 10, SOUTH JOHN 4S. ST. GlONON S -4 .7r:7 ' LON DON OFFICE & SHOWROOMS 15 Bedford Street. Strand, W.C.Z. Wireless Music, Song and The BURNDEPT ULTRA IV RECEIVER Speechinthe Home. In addition to receiving ALL BRITISH CONCERTS will also receive loudly and clearly the Hague, Paris and Berlin Concerts as well as morse code messages from allEuropean, North African, and some American commercial stations. SHORT WAVE (CONCERT) COILS. These coils have been specially designed for BROAD- CASTING and NEW AMATEUR WAVELENGTHS. They are 3in diameter and mounted on standard BURNDEPT coil plug so that they are interchangeable with BURNDEPT PATENT COILS The new coils (4 in number) replace Bumdept Coils No. 25 and 5o which am now discontinued. Price 2C- Set of Four Coils. 1/JAISTRATED CATALOGUE containing touch useful information including details of all our apparatus and complete receiving equipments for one up to four valve sets is sent Post Five for 6d. LONDON SHOWROOMS: 15, BedfordStreet,Strand, W.C.2. BURNDEPT LTD., Manufacturers of WIRELESS APPARATUS, AERIAL WORKS, BLACKHEATH, LONDON, S.E.3 THE WIRELESS WORLD AND RADIO REVIEW AUGUST 5, 1922 ELECTRICAL MEASURING INSTRUMENTS THE WESTON MODEL 280 VOLT -AMMETER Triple Range. 150/15/3 Volts. 15/1'5/015 amps. ThisPrecision InstrumentisespeciallysuitableforWireless Research Work, i.e. 3 Volt Range.Testing accumulator cells, dry batteries, measuring fall of potential across potentiometers. 15 Volt Range. -Testing8or 12 volt accumulator supplying voltage to valves. etc. 150 Volt Range.- -Testing H.T. Batteries, etc. 0.15 Amp Range (150M.A.) -Measuring H.T. current to transmitting valves,determiningresistanceofTransformers,chokes, telephones, rheostats,etc. 1.5 Amp Range.Adjusting filament currents, etc. 15 Amp Range. -Measuring output or charging current of accumu- lators, etc. NOT1-- -The 3 volt range may be used as a sensitive low range Milli -Ammeter. SEVEN INSTRUMENTS IN ONE CASE. PRICE £ 1 5, less 20 per cent. Leather Case15/ - Write for further particulars. WESTON ELECTRICAL INSTRUMENT CO., LTD. Audrey House, Ely Place, Holborn, E.C.1 MODEL 280 Telephone :Holborn 202g. Telegrams : Pivoted, Smith, London. MAGNAVOX THE WORLD'S 171.5\CES1 ADIO LOUD bringsit MAGNAVOX SPEAKER tellsit. No. R1293 `Broadcastingfaithfullyreproduced (14" Horn). with marvellous clarity ana' volume Sterling Telephone & Electric Co., Ltd. YOUR TELEPHONE HOUSE, 210/212, Tottenham Court Road, London, W.1 ENQUIRIES Telephone No.: 4144 Museum (7 lines). telegrams: Cucurnls, Wesdo, London.' INVITED. Works :DAGENHAM, ESSEX. BRANCHES :NEWCASTLE -ON -TYNE :9, Clavering Place. CARDIFF :8, Park Place. iii GAMAGESAUGUST 5, 1922 - THE- WIRELESS WORLD AND RADIO -REVIEW LEAD IN AMATEUR WIRELESS FIRST IN 19O8-FOREMOST TO -DAY Exceptional Offer of 'PHONES BROWN'SDouble Head- piece49I6 Receivers, 8,,000 ohms. IMPROVED TYPE OF Ditto, 120 ohm., FILAMENT RESISTANCE The above has been produced by us to meet the present demandforacheapyet efficient Filament Resistance 4216suitable for mounting to the SULLIVAN'S Double Head-purchaser's own instruments. piece Receivers, 8,000 ohms. Itiseasily attached, and when fixed is very neat and attractivelooking. The Resistance is wound on an air core in a grooved Ebonite former. When mounting 36,6all thatisnecessaryisto Without leads. Inperfect drill a hole in the panel for condition and absolutely new. the spindle and three holes LOW FREQUENCY All sent post free. for the fixing screws. Remove the ebonite knob and screws from theresistance,insert AMPLIFIER the spindle and collar through the centre hole in the panel The single stage low frequency and attach firmly by means Amplifierhereillustratedcan ofthescrews. Replace be easily connected to any valve knobtocomplete. To or crystal receiving set, thereby indicate the " Off " position increasing the efficiency of the a mark should be made on receiver by 5o%. With the use the panel to correspond with ofthis instrument,signals are thearrowontheknob. rendered verydistinct, and These resistances are suitable many otherwise inaudible messages for one, two, or three valves. are sufficiently strengthened as to become Size zr wide by e high. readable.This Amplifierisparticularly PRICE SIB suited for the reception of telephony and music owing to the absence of noise usual with multi -valve amplifiers. The transformer used is the finest on the market, and the design and finish of the FULL VALUE whole instrument are up to our usual high standard of FOR MONEY excellence. Length r, width 6`, height 311-'. We are offering ALWAYS this fine piece of appara- tus at the extraordinary low price of 42/- Post Free. "WESTON" MOVING COIL RELAYS WRITE NOW FOR OUR This well-known instrument is one of the most sensitive relays obtainable. It consists of a very delicate permanent WIRELESS magnet (" Weston "), moving coil instrument movement and is provided with a platinum circuit closer in place of CATALOGUE a pointer.The contact screws are adjustable and are so arranged that the contact closer can be set to move through Fullyillustrated,givingall an arc ranging from .11' to less than x-rooth.It is highly details and prices.indispens- recommended for all classes of work where an extremely able to the man who wants the sensitive relay is required ;the attention of wireless best apparatus at the lowest enthusiasts being especially drawn to same for the purpose prices. A copy will be gladly of experimenting in wireless recording.We are now sentPOST FREE ON offering this beautiful REQUEST. instrumentatthe low price a 5g/. Post Free. - GAMAGES, HOLBORN, LONDON,E.C. 1. A Iv THE WIRELESS WORLD AND RADIO REVIEW AUGUST 5, 1922 All-round Engraving Nothingcomes amisstotheTaylor -Hobson Engraving Machine. Moulds for tyres or tiny seals come within its scope. Bold lettering for Name -plates, Indicators, Scale or Clock Dials-all are cut quickly and accurately. The output of the Taylor -Hobson Engraving Machine is uniform and of high quality.Its speed alone earns it a place in every efficient factory. It costs little to run.It pays for itself quickly. It is used all over the world for work on Metals, Hard Rubber, Wood and Celluloid. Write for fullest particulars immediately. TAYLOkTAYLOV11013501i.b? 74a, Newman Street,London, W.1 Works : LEICESTER. R.FP-3g:0 fr:V:41p0 IMPORTANT NOTICE c).34 Z D f 0 . ? ' hi it" ..a"Ng 2L.g.E.'CT ri 5, g- ". $) ,-- g ,t"4to i--°Fmncli o < Z all I'- 4 ro.p.cr 1 o A. C. Cossor, Limited, hereby give notice M 'VI. 3 that the order of Mr. Justice Russell of the P Z //1-, ' . ,2-.' = 09 g ' " V i Ef tO p ) _.-.6Oki § 1st Viarch, 1922, continually advertised by 0 0 ,t$ Q. -0-0 0 6 2 L 4 '" 0 S Pa ' 7 °- is ?-; 026' the Marconi Co., was an order ARRIVED n r" Z g a.= B-.= ts zr g c la. " --- to. EL, AT BY CONSENT. '-' Q.- n 'El !.., ch .Z.? 10 SW u.12.18 P 2 a -.. I, 'o 71 X" Z 9 .1r, M i, Being engaged at the time in the production On 2 .,14.Eri c';Om > - ri-cz,ea 17, o. 5* g. -i---.4 ,..-....- 2 of an improved and different type of valve, n. - .Q. ov . LP 7 wi f.0 A. C. Cossor, Limited, did not consider the por)a r ASACI-lt....... 0 O ... i tAA 9.e, 'Vg.1 Z patents in question of sufficient importance ea P.M in . "m" s. .. tri 0) a) to warrant the expense of litigation. 4: (54;;-.. O litc) 10.47.g a. n- 0.-.5. ,..g o g, izt,1,OiX <,17, 1 t... r....0 ni ... o n-cZ' w, 7 A. C. Cossor, Limited, respectfully leave the R g g 4 a. :s. 0 . ri public and the Trade to judge whether the r4 (-).t,ti,z' x - .2 2 v. 0 A§A a , g.. 0 constant repetition of the notification of the ,,, :-.. ..11-0-,n.,. 6, )4 co -- PIL, -..: - Z to '17) judgment referred to is necessary or expedi- 0 ..0--8. c_,, 0-op-"x C 2 ° cr. to Pr) ent in the circumstances. ci. ELV, O % a CI5-'2 51C cpa Iv' z 6-. 9,...rg 4 F.; Z-1 .1 r. F F.; < 0 .. 1',4V, n ,1 A. C. Cossor, Limited, co ----, 5 '6**2 C. -;.`4a 0.. t, :=.rri f t . 6 1t o 1 '0 10 Cl. Aberdeen Works, z ..g ;.-) g ,.. M cr e wee o .0. -.,., Aberdeen Lane, .:1'1".1'-' .c:''' ti.,..g g II z o = Highbury Grove, N.5. AUGUST 5, 192: THE WIRELESS WORLD AND RADIO REVIEW Here is EVIDENCE of the SUPERIORITY,EFFICIENCY and the EXTRAORDINARY RANGE of The following comment has been received from the Chief Designer of Headingley, the Manufacturers : - Arnold Road, " Thanks for copy of the very interest- Clacton -on -Sea. ing letter from your Clacton -on -Sea customer, which confirms experiments Wireless Supplies, we have been conducting. Irepeat 64, Mortimer Street, W. that in our opinion the developments in Crystal Receivers will, if anything, 26th 7aly, 1922. be even more amazing than the de- velopmen'sinWirelessTelephony Dear Sirs, itself." J. W. FOTHERGILL. As promised, I let you know that I succeeded incatching For Local Broadcasting up the WRITTLE Concert for use with headphones the last eve-over 40 MILES Crystophone isall you re- AWAY-but I had to put on quire, but there are good, a muchlargercondenser. solid reasons why it must be Willcallwhennearyour address. A. J. PAINE. Specially designed Variable Condensers for the Crystophone will be available in 10-14 days.