should weigh with anybody in making a choice, the article being fol- lowed by five full -page test A Cautionary Tale Unquestionably the "King of Speakers --this new LOEWE last few years have brought the gramophone industry There was another factor : broadcasting in itself, far just been published (Iliffe Sons,
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[PDF] All About- - American Radio History
should weigh with anybody in making a choice, the article being fol- lowed by five full -page test A Cautionary Tale Unquestionably the "King of Speakers --this new LOEWE last few years have brought the gramophone industry There was another factor : broadcasting in itself, far just been published (Iliffe Sons,
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COLOL
SUPPLEML
All About-
r- jWireless Magazine,December 1930 11Vextveryd
wytecavt4.1Wble-
THE " HYPERDYNE"DEPENDS
UPON THIS RcoLewcos Ultra Short Wave Coils (with magnetic reaction-references A.M.S.4 and 9)-are specified as the oscillation coils
for the " Hyperdyne" described in this issue-Prioe6/ eachFit Lewcos components and you willnoticethat a sonoroustone hasreplacedthathithertoindifferentre-production.EveryLewcoscomponentlives up to its manufacturer'sworld - widereputationfor" perfection ineverydetail."
Fully descriptive leaflets of theUltraShortWave Coil(Ref.R64) and the D.W.A. (Ref. R65) willbe sent on request.Pleasequote reference number. THIS111,H11111111111111111111111
PRICE -1=== 4 cI diThe Lewcos Dual Wave
is specified as the Aerialforthe"Hyperdyne "cribed in this issue.11111111111111111111111111'iTHE LONDON
ELECTRIC WIRE
COMPANY ,-.ND
SMITHS
LIMITED,
Church
Road,Leyton,London,
E.1001-c9137.
Radio Products
JAettlr
receptionCoil Coil des -LARGE STOCKS
OF LEWCOS
RADIOPRODUCTS
ARE HELD AT
ALL BRANCHES
t 0Editor :
BERNARD E. JONES
Technical Editor :
J. H. REYNER,
B.Sc., (Hons.), A.M. I.EE.
IN yet
another special sup-plement we are reviewingand illustrating no less than135 different models of loud-speakers this month, and foreasyreferencearedividingthem into eight groups.
More than sixty of thesemodels have been personallytested by us, and for the readerwho is never satisfied unless heis told how things work, we are'presenting diagrams explainingtheaction of fourdifferenttypes.
In addition, W. James con-tributes an article on "Gettingthe Best Results." Altogether,thisissue provides the mostcomprehensive data on modernloud -speakers ever put togetherin any one issue of a periodical.
Forreadersdesirousof
choosinga ready-madeset,the article "Give Them RadioThis Christmas !" is intended ;in it are mentioned the manyconsiderationsthatshouldweigh with anybody in makinga choice,the article being fol-lowed by five full -pagetestreports of as many importantsets, including two A.C. three-valvers, an A.C. four-valver, abatterytwo,and anA.C.radio gramophone.
"We Test Before You Buy,"based upon our own personaltests and written on original,independent lines, has rapidlybecome a favourite feature withthe reader and, in addition, apronouncementofvaluetowhich manufacturers give theirserious attention.
The gramophone must loomlarge in any Christmas num-ber.As usual, we review thebest of the new records (with aspecial eye to Christmas re-quirements), and Capt. H. T.Barnett-who lives with thegramophone by day and dreamsof it by night-contributes thefirst of a special series of arti-cles entitled" Secrets of Gramo-Radio Success."
"Thermion,"of AmateurWireless-surely the "Ther-mion" pages in our weekly con-temporary are the best-known"chat" feature of any radiojournal in the world-offers acarefulexplanationoftheStenode circuit.He has hadspecial facilities for studyinr,Dr. James Robinson's already'famous invention which makespossible in connection with asuper -het a degree of selectivityof an order previously un-dreamed of.Wireless Magazine
The Best Shillingsworth in Huai°
Vol. XII
:: DECEMBER, 1930::CONTENTS
ALL ABOUT LOUD -SPEAKERS -16 -PAGE
SUPPLEMENT (after p. 472)Permanent -magnetMoving Coils..Electromagnetic Mov-ing Coils ....GettingtheBest Re-sults, by W. James . .Farrand InductorModels....Cabinet Cones ....No. 71 HowYourLoud -
2speaker Works..A Directory of Manu-
2facturers....Plaques and Open Cones4 Linen and DoubleCones6 Cone Chassis and Units6 Loud -speaker Units
..8 12 13 14 15 16 Page Valves to Use in Your Set .444Broadcast IdentificationSheets.By Jay Coote ..450
51.614olerigtirr4-tive-Werith
In TuneTune with the Trade. A
Review of Catalogues and
Pamphlets....456Catalogues We Have Re-
ceived....462"Bottled Music." ByBernard E. Jones..467
A Score of Christmas Gifts !468Oh, That Alternative Pro-6ramme !By W. Hadfield
Craven....470
For Your Wireless Library
472Radio Medley. By
BM/PRESS..473
A Cautionary Tale. Verse ..
474The Regional A.C. Four.A Band-pass Set by W.
James....476
The Leaky Grid
480GRAMO-RADIO SECTION
The Month's Notes andJottings....Secrets of Gramo-RadioSuccess,
byH.T.Barnett,M.I.E.E.The Legacy. Verse ..Choosing Your Christ-mas Records. Reviewsby Whitaker -Wilson481 483483
485
The Five -point Two. A
Dual -range Set with Plug-
in Coils....489China's Communications ..492Under My Aerial. Halyard'sChatontheMonth's
Topics....493"Ask Me No More." Verse495
" War "Against the B.B.C:
By Whitaker -Wilson:.4%Page
Solving Some Mains Mys-
teries.A Half-hour withProf. Megohm
.498A Wireless Alphabet .500Dancing to Radio-at Christ- mas.By Kenneth Ullyett501Give ThemRadioThis Christmas IBy AlanHunter....502We Test Before You Buy :-Chr omogr am RadioGramophone...504
PhilipsA.C. Three-
Model 2531..505Gambrel' Four-valver-Model R4A.C.....506Kolster-Brandes Pup-Two-valver..507Gecophone A.C. Three-Model B.C.3130..508The Hyperdyne Receiver.A New Style Super -hetby J. H. Reyner,B.Sc.,A.M.I.E.E...509The Stenode Circuit.Ex-plained by " Thermion "
514When Wood Won't Work..518
Screened -grid Bias ....518A.C. or D.C. ?
518A Resurrection I518
Live Gettering..518Those Announcers ....518Anode Volume Control..520About Screened -grid Valves
520Fake News Bulletin !..520A Listener's Log.By Jay
Coote..522Music via Ether and B.B.0
News...:524Portable S.G.3 Results..530Programmes from ForeignLands...532Baird's Reply to the Editor
536Readers Test Some - W.M."
Sets..540
Tests of New Apparatus..542
Radio in Review:.546
Query Rules
.:552Index to Advertisers.552
Published by BERNARD TONES PUBLICATIONS, LTD., publishers nJ " Wireless Magazine" and" Amateur Wireless:Editorialand Advertisement Offices : 58-61 Fetter Lane, London, EtC.4:Telephones
City 3733. 3734.
Telegrams :" Beejapeei Fleet, London."Published
aboutthe 23rd day ofthe month and bears the date of the month following.Subscription:Great Britain and abroad, 15s, 6d. a year,post free (Canada only,13s.ad.)Contributions areinvited and will bepromptly considered.10Research Consultant :
W. JAMES
Assistant Editor :
D. SISSON RELPH
When "Thermion" wrote his
article no set manufacturer hadyet incorporated the principle,but, as we point out editorially,some firms are now onthepoint of production with setsthat will embody the Robinsonpatent ; we shall keep readerswell informed on the subject asit develops.
J.L. Baird, through themouthpiece of Sydney Moseley,repliesin our pages to myarticle last month in which Iasked whether television is ata standstill.
Mr. Moseley replies with anemphatic "No," and you willread his vigorous contributionwith pleasure-mingled, I hope,with sorrow for me, at whomhe makes his hits.
I am accepting Mr. Baird'sinvitation to pay another visitto his studio and laboratory.Our sets this month embodysome particularlyinterestingideas.The Regional A.G.Four, W. James's successor tohis Regional Band-pass Four,which was a batteryset,isworth while ; you will find it anideal basis for a radio gramo-phone.
TheFive -pointTwoisanother editionto a famousrange of sets.The Hyperdyne is an up-to-date version of our old friendthe super -het, a receiver deluxewhichourTechnicalEditor, J. H. Reyner, guaran-
teestogivea performance"which seems almost likeadream inthese days of theover -crowded ether."The Hyperdyne possesses allthe advantages of the old super -het, but without the drawbacksthat were responsible for itsretirement into the background.In addition, it has some specialadvantages-only two operat-ingcontrols ;works on anindoor aerial; can be adapted
toultra -short-wave receptionand, compared with the oldsuper -het, the constructionis economical.My spaceis gone ;I canonly in conclusion allow myselfthe great pleasure and privilegeof wishing you all a HappyChristmas and of reciprocatingallthose good wishes whichduringthe past few monthshave reached me from so manyof my readers at home andabroad.THE EDITOR.41111.4440.........**************************************************************
Registered at the General Post Office for Transmission by Canadian Magazine Post 441Wireless Magazine. December 19301
z/,,,/ ///, ,d3 loiJA (tverxbotiR can.GIVE PERTRIX
DRY BATTERIESAND
ACCUMULATORS AS
PRESENTS THIS YEAR
DRY BATTERIES
ACCUMULATORS
6o volt Standard ...
8/-PXG220 a.h.9/6
15/6PXG430 a.h.11/613/-PXG3I00
13/-PXG513/6
1503,.I....31/-I-PAC28/6120
,,5,6oSuper15/6
too17/621/-PXG6
120,,,,4/625/6tPACI t With l'ertrix Patent Carrier. * On slow(li: r* 1 W a W/Ojiz'?',11/4#ilA Y.1# . zo #7/AiJ,,,/i. ;, op// i I, ;Ae 442
Wireless Magazine. December 1930
Ai#/r#/'/////ffAltiyh,
have betYerr thisGood company
...bright lights...a cheery fire...happy laughter...and music clear and pure from a goodradio that has been made better by Pertrix. What morecould one wish for ?
It is because NO sal -ammoniac is used in a Pertrix Batterythat it gives the purity of current that is so essential inobtaining perfect reception.So don't forget, make it aPertrix Christmas this year and enjoy your radio.
Pertrix Accumulators more than do their bit in givingyou better L.T. current, too.