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PAGE OUR NEW SERVICE FO ISTENERS Wireless Magazine. September. 1929 tfluiEviQ et) mJ- 56, FAMOUS LEWCOS COILS specified by experts for the SHORT-WAVE "ETHER RANGER" COIL BROADCAST COILS A.M.5 and 20 OLD PRICE, 7/6. NEW PRICE, 7/- each. SHORT-WAVE COILS A.M.S.4 ant 9 OLD PRICE, 10/-. NEW PRICE, 7/- each. 6 -PIN BASES. Ref. S.P.B. OLD PRICE, 2/9. NEW PRICE, 2/3 each. LEWCOS H.F. CHOKE OLD PRICE, 9/-. NEW PRICE, 7/9 each. Special attention is drawn to the reduction in price of many Lewcos Components. H.F. Leading radio experts everywhere have THE recommended LEWCOS coils for their supreme reliability in receivers of all descriptions. Take their advice and get more enjoyment out of your set. RADIO PRODUCTSºFan. THE LONDON ELECTRIC WIRE COMPANY AND SMITHS LIMITED, Church Road, Leyton, London, E,10 Phone: Walthamstow 2531 Grams "Lewcos Phone," London Stocks available at 7 Playhouse Yard, Golden Lane, E.C.1 n Editor : Research Consultant : BERNARD E. JONES Wireless Magazine W. JAMES - t Technical Editor: The Best Shillinttsworth in Radio Assistant Editor: OAJ. H. REYNER, D. SISSON RELPH B.Sc. (1 Ions.), A.M.I.E.E Vol. X :: SEPTEMBER, 1929 :: No, 56 Our Autumn Developments CONTENTS HAVE been very busy preparing a new depart- Page -Page ment. You will not be surprised to learn that with Valves Your Set 90 Glimpses of Some Broadcasters. the ever-increasing popularity to Use in .. of WIRELESS Relayed Aeroplane Talk .. .. 92 Cartoons 135 MAGAZINE, an extension of our premises has become Broadcasting Rumania .. 92 Weird Wireless Echoes. By Gerald absolutely inevitable, in and it follows that, during the Wavelengths of the European Sta- H. Daly .. .. .. .. 136 last six weeks or so, I have been doing little else than tions 94 The Expensive Wife. Verse .. 138 planning and supervising the fitting up and equipment of 138 In Tune with the Trade 1 96 Electric Music .. .. .. a brand new testing and constructional department. 138 My U.S. Radio Diary. Compiled Fire ! .. Special announcements in our pages this month will During a Recent Tour, by Alan The Stay -put Two. An All - acquaint you with what we have in mind : briefly, S. Hunter 99 electric Receiver Designed by while maintaining to the full our keen interest in all 139 Our New Service for Listeners . 101 J. H. Reyner, B.Sc.. A.M.I.E.E. constructional matters, we shall in the future devote Stabilising Your Screened - grid Making Your Set More Selective 143 space regularly to reviews, descriptions and test reports Valve 102 No Solitude-and the New -year of manufactured receivers, recognising that so great will Magnification from An L.F. Three. By J. Godchaux Abra - be the number of different sets produced this coming Transformer 102 144 season that non -technical people will need independent Controlling the Volume of Your The Woman's View. By Bess advice in making a proper choice. 103 Marshall 146 I am proposing also to make our Gramo -Radio "Tuned Anode" and the S.G Valve 103 Grid Bias for Nothing l 147 Section more helpful in every way, to which end it will Teaching Music by Radio. By Dr. The Adventures of Alec Trode .. 147 in future contain reviews of the best of the gramophone Alfred Gradenwitz 104 How the L.F. Transformer Works. records and will present regularly more or less complete "Canned" Noises Off .. .. 105 Another Half-hour with Prof. lists of new records. When Water Is Scarce 105 Megohm. 148 In our next issue-which I have reason to believe will Finding New Voices for the Ether. Under My Aerial. Halyard's Chat be the best I have ever presented to the public-readers By Frank Rogers 106 on the Month's Topics .. 150 will be able to see for themselves the extent of the new The Fanfare Three. A Simple Set Hush That Loud -speaker I 152 service which we are offering. Will you particularly for Radio or Record Reproduc- Tricks with Screening -grid Vol- make a point of this next issue which, in addition to tion 107 tage 152 reviewing the chief exhibits at Olympia, will contain Chinese Find Wireless Dull .. 111 The Last "Proms" to Be Run by features unequalled in any other radio monthly. Radio Cures Laziness .. Ill the B.B.C. ? ; Special Article by This present issue, September, gives a taste of our Why We Need an International a Savoy Hill Official 153 quality. Alan Hunter, who with the Head of our Language .. 112 Leaves from A Listener's Log. By Constructional Department, J. Sieger, recently Jay Coote 155 enjoyed an opportunity of acquainting himself with GRAMO -RADIO SECTION The Arrow Four. Utilises a New American radio matters, contributes a brief account of and Efficient H.F. Combination 156 some of the things he saw and some of the people he met More About Bass Reproduc- Getting Your Grid Bias from the on the other side of the Atlantic. tion. By H. T. Barnett, Mains. By W. James .. 162 The set to which our cover design is devoted-The M.I.E.É. 113 Broadcast Music of the Month. Ether Ranger-is capable of fine results, and I Hearing Light and Seeing Reviewed by Studius 166 Sound .. .. .. I14 should like you to turn over our pages to the article The Music Listener : All About in Records for Your Radio Speed. By C. Whitaker-Wilson 170 entitled " The Modern Magic Carpet -1929 Model," 1I5 which W. Oliver makes a world tour by radio and Gramophone .. .. Test As You Build .. 174 shows what a set of the Ether Ranger or Clipper Two Television in the Air 176 type is capable of achieving. Why !Have Designed A New Type Around the Scanning Disc. By H. The Fanfare Three meets up-to-date requirements, of Tuning Coil. By W. James .. 117 J. Barton Chapple, Wh. Sch., its two transformer couplings giving both convenience The Ether Ranger. A Self-con- B.Sc. .. .. .. 178 and quality for radio or gramophone reproduction. tained Two-valver for All X's and DX's 180 The Arrow Four, so called because its selective Wavelengths .. 121 A New Set Tested. By J. H. tuning is never " beside the mark," uses a new H.F. A Beginner's Guide to Wireless Reyner, B.Sc., A.M.I.E.E. 182 combination consisting of the S.G. valve with an ordinary Symbols .. .. 126 Frequency Records for the Experi- neutralised H.F. valve. Finally, for that 4o per cent. of The Modern Magic Carpet -1929 menter 184 householders who have the advantage of mains supply, Model. By W. Oliver .. .. 127 New Transatlantic Telephone Ser there is the Stay -put Two, y. H. Reyner's special An Appreciation of the Clipper vice 184 contribution to this issue ; it is an all A.C. set, small but Two . 131 Travelling Abroad with A Portable 186 My Aims. By Albert de good, and uses the new type " Q" coil. Radio Radio Stations to Serve Fourteen Courville .. 132 Our special correspondent, Dr. Alfred Gradenwitz, Cities 186 who carefully watches Continental radio on our behalf, Chicago Catches Its Criminals by Radio .. .. .. 132 Reference Sheets. Compiled by J. describes in this issue how the Berlin Academy of H. Reyner, B.Sc., A.M.I.E.E. 188 Music provides musical instruction via ether. Fifty Loud -speaker Stations on a Four-valver ! .. .. .. 133 Index to Advertisers 192 Published by BERNARD 'ONES PUBLICATIONS, LTD., publishers of Do Not Overlook " Wireless Magazine" and Amateur Wireless." Editorial and Adver- the Half-price Blue- tisement Offices : 58/61 Fetter Lane, London, E.C.4. Telephone : City 3733, print Coupon on 3734. Telegrams : " Beejapee, Fleet, London." Published about the 25th day of Page iii of the Cover the month and bears the date of the month following. Subscription : Great Britain and Abroad, 15s. 6d. a year, post free (Canada only, 13s. 6d.) Contributions are invited and will be promptly considered. On September 20 Our Enlarged Exbfbitlon Issue Wile Be On Sale n'etistered al the General Post Office for Transmission 'e ana.ìinri M,eezine .89 (Wireless Magazine. Septemben1929 Valves to ZIse iriYour Set TWO -VOLT VALVES FOUR VOLT VALVES Amp. IA nodeFil. Amp. I Anode I Fil. Make Type I Impedance Volt. Cur. Make I Type Impedance Factor Volt. Cur. Factor Three -electrode Three -electrode Dario .. Resist. 30 150 .075 150 .I Marconi ... H410 60,000 4° I20 .I Osram DFH4u 40 150 Cossor 2IoRC 60,000 40 150 150 .I Cossor 41 Rß 4° Dario Resist. 3° 150 59,000 150 .I Six -Sixty 58,000 37 .075 Mazda .. Hzio 47 150 2IoRC 39 150 .I Mullard ... PM3A 55,000 38 .075 Six -Sixty 55,500 140 .07 Mollard ... PMIA 51,000 36 150 .I Triotron ... WD4 46,000 46 150 .I Dario ... Super HF 21,000 25 I00 .075 Marconi ... H21° 50,000 35 150 r 150 .I Cossor 41oHF 20,000 20 Osram DEH2I0 35 150 ... WD2 46,000 46 150 .07 Mullard ... PM3 14 075 Triotron 13,000 13 120 .07 Six -Sixty 2IOHF 25,000 19 150 .1 Triotron ... AD4 150 .I Six -Sixty 12,500 13.5 150 .075 Marconi ... HL2I0 23,000 20 4°75HF . I0,000 IO 150 .075 Osram ... HL210 ¡ 20 150 .I Dario ... Univ. 22,500 18 150 .I Triotron ... RD4 9,000 9 140 .07 Mollard ... PMIHF 150 .I HL2I o 26 150 .I Marconi ... L410 15 Mazda... 2I,000 150 .I Dario ... Super HF 25 1.50 .18 Cossor 41oLF 8,500 15 15 150 .I Osram ... DELI to 15 150 Cossor 2IoHF 140 .14 Triotron ..