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Oiiragm Lt` R2 ALTITUDE TESTING CHAMBERS NEWNES @V[Ig OiiragM Lt`r2 EDITOR : F. J. CA MM AUGUST 1949 A CONTROL -LINE JET-PROPELLED MODEL AIRCRAFT IN FLIGHT. SEE PAGE 346, Studies in Electricity and Magnetism Elements of Mechanics World of Models Jet Reaction Power Models Woodturning Letters from Readers Model Engineering Practice Simple Electronics Cyclist Section CleVPS etc.,etc. %AOWE dips, stainless produced. clips, wehave bronze range ITSS,VOIS clips, ownspecification. steel theenormous your and size from clipto shape selection any inevery tiny design show a can yourdisposal. Herewe Department is at Research e-Aperience Our of clip-making (9-3 years Two popular types. In range of sines to grip from Delivery from Stock. No, 80 No. 300 A drawing boardslip. Platedfinish' de- livery ( Stock. 4/- dovz. z. Plus P.T. The roost informativepsstvefr:.:enrxedt-. bookhe n yet 2,.Wings 10/6 ".shed Sole Makers : HERBERT TERRY & SONS LTD. REDDITCH. London Birmingham Manchester August, 1949 NEWNES PRACTICAL MECHANICS 325 THE " ZYTO " I5in. MOTORISED SAWBENCH IFYOU TAKE PHOTOGRAPHS WITH TOTALLY ENCLOSED MOTOR GET THIS JOHNSON 1-20 TANK AND FOR CROSSCUTTNG, RIPPING, DEVELOP YOUR FILMS INDAYLIGHT MITREING, BORING, GROOVING, etc. You lose half the fun of photography if you do not develop Brief Specification: Saw -table 24in. x t8in., with rise and your own negatives and make your own prints.Itis much fall motion for grooving, etc. Takes cheaper to do the work yourself and you see your results 15in. saw. Long ripping fence with more quickly. fine adiustment: Heavy spindle bored to take dowel bits, etc. J-20 TANK, az illustrated below, is for all size -20 roll films.Holds h.p. motor provided. 10 -oz. of solution. Enables you to develop, fix and wash a Suppliedsinglethree-phase or D.C. current. filmindaylight. Price 211-. PLEASE STATE VOLTAGE. PRICE AND FULL DETAILS JOHNSON ADJUSTABLE TANK for amateurs who require FREE ON APPLICATION. a tank for more than one type of camera spool.This tank takes six sizes of film: 16 mm., 35 mm., x 21 x 21, 21 x 31 and 2'4 x 41.Price 2716.Ask for it at your dealers. SPECIAL OFFER For three pence in stamps we will send you a book on Home Photo- graphy. Itwillinterest all amateur photograph- ers. forittells how to developfilms,how to make contact prints and how you can do your own Pro of S. 2 YZACK SON, Ltd. enlarging. Thereis a THE " ZYTO " BENCH HAND- 11111r - chapter on takingpor- FEED DRILLING MACHINE Drills to centre of 8in. circle. traitsbyartificiallight. Chuck to table,71in. Hand -feed depth, tin. Mark your envelope clearly Weight, islbs. Practical Mechanics offer. Chuck capacity, o -)in. PRICE 57'- (carriage paid) .JOHNSONS OF HENDON LTD. LONDON N.W.4 S. TYZACK & SON, Ltd., 3LONDON,LE.C.1. Established 1743 Telephones: CLERKENWELL 8301 ,Ten lineal. 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Q, T14 0 TO N LTD LONDON SHOWROOMS: I12, HIGH HOLBORN, W.C.I. zEzzuving .9n4t/uunetzt Specialioti MANCHESTER .28, CORPORATION STREET. 41 GAR.TJIDE/T.MANCHEITER 3.I Visit our London arid Manchester Branches, where our staff isat your service. 326 NEWNES PRACTICAL MECHANICS August, 1949 ,,,,,,,W.WIWAASS,WaY.M.V.V.VVV.N.,,,WAAVO.W1,,,Wkw..m,,,,,,,,, Largesstocks' I.C.S. TRAINED MEN bestselectionst L.1 and Bargains in Ex -Services Radio and Electronic Equipment Brand New in maker's carton. Brand New MINIATURE arein Greater Demand "SIROCCO " BLOWER, WITH SHUNT MOTOR 230 v. A.C. MAIN l MOTOR 27voltsD.C. 1.5 a. Not a convertecrimit 1/50h.p.3,000r.p.m.. operates from 230 than Ever-Maximumproduction continuous running,multi- A.C. mains.Single Phase, 5'o cs. A bladedfan,outletdia. beautifully made depends onhigh technicalskill,such 2lin. Size overall 7 x 5 x synchronous frac- 6in., mnt. size 7i x 5 x tional H.P.-miniature 4Iirs. on rack 16 x 12in. motor.Dimensions, asthat acquiredby I.C.S. 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New method gives better than E524,for 24 volts t/6 h.p.Ideal for light ben:h The man with_an I.C.S. Training in any one of the subjects D.C.Small dimen- work, a tin. spindle is available listedbelow knowsitthoroughly, completely,practically. sions:length 2.1in., (when the fan is removed) for diam. itin. driving.Motor Generator type .Andheknows how to applyitinhiseveryday work. 29, sized X 51 X 5;i11. CLYDESDALE'S 24 V.16 a.Output 1,200V. PRICE 200 ma. Acccuriancy Diesel Engines M ming Engineering ONLY CLYDESDALE'S S, 0;0 Using Draughtsmanship Motor Engineering 5/11 each PRICE ONLY 251- each Luc Engineering (State which branch) Motor Mechanic POST PAID CARRIAGE PAID Air Ern Vacuum` Drawing Office Practice. Motor Vehicle Elea All goods advertised or in our list can he ordered from any of our branches, in England rules Electrical Engineering Municipal Eng. and Northern Ireland. 01 direct from :_ Air-Cenditimn.ng Electric Power, Light- Plastics sum, G2LEAGIDGEOW ST. 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