free data sheet inside! · 2019. 7. 17. · sir john ambrose fleming, sir richard tetley...

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Practical IV irele8,,, l'ebruar918171, 1933 FREE DATA SHEET INSIDE! Published every Wednesday by GEORGE NEWNES LTD. Vol. L- No. 22 FEBRUARY 18th, 1933 7?, f/I,10 I,I1 I lir (; .7..0. u. a A ,irspope r. PILOT Q. P. P. CONVERSION KIT Ai "1" SEND DIRECT_ ,TO AVOID DELAY Li--Zr

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Page 1: FREE DATA SHEET INSIDE! · 2019. 7. 17. · Sir John Ambrose Fleming, Sir Richard Tetley Gliccebrook, Professor Miles Walker, Professor T. Dover, Mr. Kenelna Edgcumbe, Ca,i 'eel Sir

Practical IV irele8,,, l'ebruar918171, 1933

FREE DATA SHEET INSIDE!

Published every Wednesday by

GEORGENEWNES

LTD.Vol. L- No. 22FEBRUARY 18th, 1933

7?, f/I,10 I,I1 I lir (; .7..0. u. a A ,irspope r.

PILOT Q. P. P. CONVERSION KIT Ai "1"SEND DIRECT_ ,TO AVOID DELAY Li--Zr

Page 2: FREE DATA SHEET INSIDE! · 2019. 7. 17. · Sir John Ambrose Fleming, Sir Richard Tetley Gliccebrook, Professor Miles Walker, Professor T. Dover, Mr. Kenelna Edgcumbe, Ca,i 'eel Sir

is PRACTICAL WIRELESS

MIDGET TRANSFORMERspecified by Mr. F. J. Canum for the " Fury

. Four " . . yet another famous set designer whorays tribute to the quality and reliability of Igraine.1: alio Components. If there is one component monothan any other in which. you must have unquestioningfaith, it is the Transformer . . follow the specifi-cation.

A masterpiece in miniature-it weighs only ol,cz.,and its size is tin. by r&in. by Lafin. Primary induct-ance over 6o henries. Beautifully finished in brownbakelite. Ratios : 3-I and 5-r. Price 10/6.

OTHER SUITABLE IGRANIC COMPONENTSLogar:thmic Volume Control

\ vire wound,p,c tgranio Logarith-mic Volinne Control is fitted witha specially graded resistance.track. It has been evolved toafford a uniform control ofvolume Where a valve or valvesof the Vatiable-Mu type areranplOyed iri a circuit. Thegraded resistance makes thevolume control obey the samelaw as the valve. Sizes 5,00e,10,000, 50,000 ohms, and theycan also be supplied with com-bined switch, Price 5/6 withswitch, 7/6).

Non-inluctve Fixed CondensersThese conderiSers are sealed intoBakelite case with lugs for screw-ing to baseboard. They are damp-proof and are' tested at a voltagenearly three, times in excess oftheir rated working voltage, nisi.of breakdown is thereby mini-mised. Non -inductive, they arestrong mechanically, sound elec-trically, and fitted with sexy:terminals to facilitate connec-tions. i rind., 2/3; a mfd., 2/9;4 mid., 51 --

FOR THE

February 18th, 1933

CQMPONENTS WILL

T iie /CT fli[i'y P!us;rated Catalogue Na. J. 1241,

of Irrunic Qualify Components.

EGRIINIC ELECTRIC CO., LTD.,14% Quiff n Viclor;a EGA.

Page 3: FREE DATA SHEET INSIDE! · 2019. 7. 17. · Sir John Ambrose Fleming, Sir Richard Tetley Gliccebrook, Professor Miles Walker, Professor T. Dover, Mr. Kenelna Edgcumbe, Ca,i 'eel Sir

February 18th, 193 3 PRACTICAL WIRELESS Ell

Information U nobtaina le Elsewhere

in this entirely New publication.

P ACTICAL

ELECTRICALENG/NEE LNG

will

INCREASE YOUR MAKE YOUEARNING POWER PROFICIENT

This comprehensive new work has been written bypractical men for the practical- man. It is not for thearm -chair engin6er, but for the man who is interested inpractical methods, rather than design and theory. Itshows the approved methods of applying theoreticalprinciples in actual practice. It is invaluable for referencepurposes, and contains a great deal of data on the practicalside which cannot be found in any existing text -book.PRACTICAL ELECTRICAL ENGINEERING is NVOEIll poundsto anyone engaged in the electrical industry.

PREPARE FOR THE FUTUREThe man who is able to combine a sound theoreticalknowledge with ability as a craftsman has a wonderfulopportunity for advancement in this expanding industry.PRACTICAL ELECTRICAL ENGINEERING mitt heip the re:nier.to acquire this valuable combination.

ABSOLUTELY COMPREHENSIVEThe most modern applications of electricity, incluihngsound -film reproduction, wireless, etc., have been dealtwith fully, and in all cases the articles have been written_':early and accurately by practical men,

Whilst special emphasis has been placed on the practicalside of electrical engineering, it is understood that a soundknowledge of theory is essential to the progressive man.Valuable circuit diagrams arc given, and, whenevernecessary, the theory of operation has been simplyexplained. To the man who is " clever with his head "this book will well repay study. The man who is " cleverwith his hands " will find something of value to him onevery page.

VALUABLE ILLUSTRATIONSEvery illustration has been included with a definitepurpose. In constructional articles the illustrationsenable the reader to see the whole of the process from theearly stages to the finished product.

EXPERT CONTRIBUTORSThe contributors f) this work include many famousmembers of the profession. Sir John Ambrose Fleming,Sir Richard Tetley Gliccebrook, Professor Miles Walker,Professor T. Dover, Mr. Kenelna Edgcumbe, Ca,i 'eelSir Thomas F. Purvey are a few examples.

PRACTICAL ELECTRICAL ENGINEERING is conveniently bound in five handyvols. This binding is oil, acid, and water proof, and has been speciallydesigned so that the volumes may be referred to at any moment without

possibility of damage. The cover is full bound in Brown Rexine.

SENDCOUPON TO -DAYFOR FREE ILLUS-TRATED FOLDERCONTAINING FULLDETAILS OF THISMOST VALUABLEREFERENCE WORK

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To THE HOME LIBRARY BOOK CO.23-249 Tavistock St. London, W.C.2.

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NAME

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P. WireleE lift :3.riEKRH.MSCIEW.a6tlif...156.ffmE6t6.11,66,11111046 ..... UKIESUO.O.IgRa.k2M. ....... ...... 6ISIORX6A,4E.L.CE6m.,,71:1,,

Geo. N:tr;,,,. Ltd.

Page 4: FREE DATA SHEET INSIDE! · 2019. 7. 17. · Sir John Ambrose Fleming, Sir Richard Tetley Gliccebrook, Professor Miles Walker, Professor T. Dover, Mr. Kenelna Edgcumbe, Ca,i 'eel Sir

iv PRACTICAL WIRELESS February 18th, 1933

SEND

FOR

THIS

VITALINFORMATIONFOR HOME

CONSTRUCTORS

Write for the new series of leafletsdescribing the complete range ofLetvcos World-famous RadioComponents.

Brilliant in design and performance,the two Lewcos precision -made com-ponents illustrated-the Super H.F.Choke (Price61-) and the Potentiometer(Price 3'- to 8" -)-are fine eXamPlesof the high qua* and reliability ofall Lewcos Radio Units.

Descriptive of these componentsillustrated Refs. W78 and W79 areincluded in the series now available.

RADIO COMPONENTSTHE LONDON ELECTRIC WIRE COMPANY AND SMITHS, LIMITED, CHURCH ROAD, LEYTON, LONDON, E.10

P.W. Gift Stamp No. 21Printed by NEIN-NEB & PEARSON PRINTING CO., LTD,, Exmoor Street, Ladbroke Grove, W.10, and published by GyGORGENEWNES, LTD., 8-11, Southampton Street, Strand, W.C.2. Sole Agents for Australia and New Zealand GORDON A/GOTCIILTD. South Africa :'CENTRAL NEWS AGENCY, QED. Practiced Wireless can be sent to any part of the world, post free, for17/4 per annum ; six thohths, 5/8, Registered at the General Post Oftiee for Transmission by Canadian litiagatine Post.