' Mechanics Editor : F
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MAKING TUBULAR FURNITURE RACTICAL9D ' MECHANICS EDITOR : F. J. CAMM MARCH 1948 IN THE GENERAL FITTING SHOP OF A BRITISH ENGINEERING FIRM (SEE PAGE 210). PRINCIPAL CONTENTS Making a Telescope Reflector Electric Water Heating Practice World of Models The Conundrum of Coal Ballistics in Nuclear Physics Trade Notes A Circular Saw Bench Printing Box and Safelight Cyclist Section I/ reetWimeee/44e t&O,e AlemamfA,"; ell 99 A Cl/P FOR DRAWING BOARDS 11°3041 People are amazed when they learn of the variety Gf CLIPS we make - steel clips, bronze clips, stainless clips, big clips,small clips...clipsinevery conceivable shape and pattern ...clips for every possible use. We can make to print or specification or our Research Department can design a clip for that particular job of yours. Over 92 years of clip -making is at your disposal. k,C,) HERBERT TERRY & SONS LTD. REDDITCH London, Birmingham, Manchester March, 19 48 NEWNES PRACT CAL MECHANICS 181 66 ff BALL THE ZYTO TEN MOTORISEDBEARING SAW BENCH For crosscutting, ripping, grooving, mitre- ing,bevelling,etc. Takesloin.saw. Spindlerunsinheavyball -bearings, parallel rise and fall Table with rackfeed and 'canting for bevelling, etc.Right and lefthand mitreslides,approved saw= guards. Vee belt drive, built-in dust chute, swivel motor base. Supplied A.C.200-220., 230-250. Three-phase 400-440. Direct Current. Price and illustrated leaflet free and post free on application. 66 THEZYTO 3" CAPACITY Threeof -overFIFTY ! * We now offer from stock in Northampton, London and Manchester, a PRECISION BENCH DRILLING MACHINE range of over Fifty SHIPS' FITTINGS, in two sizes (;in. scale and ;/"Iiiin. 3 jaw, self centring chuck, capacity o- r scale), beautifully finished and nickel plated and ready for easy assembly. * THE MARINE MOTOR for motor boats up to I metre works on dry 3 -speeds, drills to centre of 6".Max- battery or accumulator, 6-8 volts, weight IS ozs.Price 3716. imum distancebetween chuck and * SCALE MODEL STANCHIONS in hard brass, unequalled for accuracy and strength-scale (,in. to I foot. base,so". Size of table,5" diam. * For particulars of these and other models now available, write now for List This can be swung clear of work. (SFI12), priceII-. Size of basemachined,5i"x5". Write also for (MYI12), price 6d.' How to Sail your Model Yacht.' Price Complete, £10/17/6 Ex Stock. (L/12) price 6d.' Stock List of Model Supplies.' With 3 -jawkeytypeself -centring Please quote our reference for each booklet. chuck, £11/18/6. BASSETT-LOWKE LTD. TOOL AND MACHINERY NORTHAMPTON S. TYZACK & SON LTD. SPECIALISTS London Showrooms :112, High Holborn, W.C.2. 341-345 OLD STREET,LONDON, E.C.1 Manchester :28, Corporation Street. Tyzgar, Frnsquare You are invited tovisit our London or Manchester branches, where our Telephone: Clerkenwell 4004 56 Telegrams : Staff isat your service. IE--THE LARGE LIP.- EASY POURING JOHNSONPLASTIC DEVELOPING DISHES THESE deep dishes are easy to empty without splashing or dribbling. Embossed ridges raise prints and prevent accumulation of sediment. Light, strong and not liable to get chipped or broken. Hard, black plastic can be kept clean, bright and free from stains. Impervious to ordinary Whatever your soldering job, in your home chemicals.They can be obtained from all photo- or workshop, you will prefer to use Ersin graphic dealers and will be invaluable to amateur MulticoreSolder. No extra fluxisre- photographers who develop their own negatives quired.Multicore isthe simple and pre- and make their own prints. cision method of making sound soldered joints for all household purposes. Just applyitsimultaneously with the soldering 4/ x 31 ( 9 x 12 cm.), 1 -in. deep iron; the three cores automatically provide x 61 (13 x 18 cm.), I7, -in. deep correct proportions of flux to solder. 61- x f4 (18 x 24 cm.), 2 -in. deep Workshop Sizes 4/10 - 6/9 each JOHNSONS OF HENDON MULTICORE SOLDERS LTD., CARTON MellierHouse, Albemarle Street, London, W.I. PHOTOGRAPHIC CHEMICALS AND APPARATUS shown above Tel.: RE Gent 1411. 182 NEWNES PRACTICALMECHANICS March, 1948 I.C.S. TRAINED MEN Tools" YOU Should have The "AEROMATIC" arein Greater Demand Soldering & Brazing Torch A general purpose low pressure gas torch with high than Ever-Maximum production pressure performance. Only needs connecting to any depends onhigh technicalskill,such ordinary gas tap. No maintenance, no adjustments, no lighting back. asthat acquiredby I.C.S. Students SIMPLE - FOOLPROOF - EFFICIENT TENS OF THOUSANDS MORE Sent complete, asillustrated, on receipt of 37I6d. with order. TRAINED MEN ARE URGENTLY NEEDED NOW-BUT THERE IS The" CRYSTAL" NO WORTH -WHILE PLACE FOR Spray Gun THE UNTRAINED The ideal tool forallpainting jobs from a model to acar. Also for house painting, distempering, etc. Connected to any standard Ambitious men everywhere have succeeded through vacuum cleaner it will produce professional I.C.S. Home -Study Courses.So also can you. results without mess, waste or effort. The man with an I.C.S. Training in any one of the subjects The " Crystal " Spray Gun will be forwarded by return,postfree,onreceipt of 751 - listedbelow knowsitthoroughly, completely,practically. with order. N. B. Please state make and Andheknows how to applyitinhiseveryday work. type of cleaner when ordering.A special connector, desirable withal! TRADE Accountancy Diesel,Engines Motor Engineering and essential with some ENQUIRIES Advertising Draughtsmanship Motor Mechanic cleaners, is availableat316 INVITED Aeronautical (State which branch) Motor Vehicle Elec. .3 extra. Engineering Drawing Office Practice Municipal Eug, Air and Vacuum Electrical Engineering Plastics 0/01Dept. P.M. Brakes Electric Power, Light- Plumbing HIBMON/ Air -Conditioning ing, Transmission, Quantity Surveying otympi DOMESTIC SUPPLY COMPANY Architecture Traction Radio Engineering Architectural Drawing Eng. Shop Practice Radio Service Eng. 341, REGENT'S PARK ROAD,LONDON, N.3 Auditing Fire Engineering Refrigeration Boiler Engineering Free -Lance Journalism Sales Management WE AREEXHIBITING (Near Finchley Central Statics) FINchley 5190 Book-keeping Fuel Technology Salesmanship Building Construction Heating and Ventilation Sanitary and Domestic Building Specifications Hydraulic Engineering Engineering Business Training Hydro -Electric Sheet -Metal Work Business Management Illumination Eng. Short -Story Writing Carpentry Industrial Management Steam Engineering Chemical Engineering Internal Comb. Eng. Structural Steelwork Chemistry, I. & 0. Joinery Surveying A Wise Investment ! Civil Engineering Lettering (State which branch) Clerk of Works Machine Designing Telegraph Engineering Coal Mining Machine -Tool Work Textile Designing Colliery Examiner's Marine Engineers Welding, Gas and Elec. S. G. BROWN, Type K ' Colliery Overman's Mechanical Drawing Woodworking Moving Coil Headphones, with Commercial Art MeehanicalEngineering Woollen and Worsted the following. outstanding Concrete Engineering Mine Surveying Manufacturing characteristics,supplythat Cotton Manufacturing Mining Engineering Works Engineering H igI.FidelityReproduction And most of the Technical. Professional, Commercial and Civil Service also C.I.I. Elements of Nat. Insurance. demanded for DX work, Exams. ; monitoringand laboratory students preparing for Examinations are coached till successful) purposes, etc. needtechnicaltraining,ouradviceon any matterconcerning If you NOTE THESE CHARACTERISTICS. yourwork and yourcareeris yoursfortheasking-free and without Let us send you full information regardingthesubject in which you obligation. D.C. RESISTANCE, 47 Ohms. are specially interested.DON'T DELAY.Make ACTION your watchword. The successful man DOES to -day what the failure IMPEDANCE, 52 Ohms at1,000 c.p.s. INTENDS doing to -morrow. Write to us TO -DAY SENSITIVITY,1.2 x 10-12 Watts at Ikc. Dyne/cm". Use this Coupon PRICE £5.5.0 PER PAIR INTERNATIONAL CORRESPONDENCE SCHOOLS LTD Supplies now available. Dept. 95, International Buildings, Kingsway, London, W.C.2 Order from your Local Dealer. For details of other Please send me particulars of your Courses in TYPE ' ' S.G. Brown Headphones (prices from 25/-to 60-) ask for illustrated Brochure Name Age Descriptive Literature on request. (USE BLOCK LETTERS) " P.M." Addrcs HEADPHONES WHICH UPHOLD BRITISH PRESTIGE Addresses for Overseas Readers Australia :140, Elizabeth Street, Sydney. 'Phone: ACOrn502 I. Egypt :40, Sharia Malika Farida, Cairo. India :LakshmiBldgs.,Sir Pherozsha Mehta Fort, Bombay. VICTORIA ROAD, NORTH ACTON, LONDON, New Zealand : 182, Wakefield Street, Wellington. ICS South Africa :45, Shortmarket Street, Cape Town. March, W48 NEWNES PRACTICAL MECHANICS 183 0000000000 trio0000000 ....... TWO MODELS Now OFIIIIE rmirilaitgraiouniori;. 000000 ifry 31c CINs ;111511-1:1 Here'sgood news :the D.L.P.Eight -in -one oo Ogr I Air -sty w,,, 10! Tool is now available in two models --the D.L.P. -Mum xwatampbilip Major and the D.L.P. Minor (the D.L.P. Major is larger).Eight different tools in one compact unit that will handle scores of different jobs. clin-PURPOSE "VOL Manufacturers of IN01.46 DRAWING and coot,Shardened jaw. grips. vice with reversible hardened Parallelvice with bender SURVEYING 2 Pipe and strip Tube, ,,:alpainvid INSTRUMENTS 34 C.ubbele',and rod co 5 Flat mmachine' 6 Screwingstepper. 7 Cable SLIDE RULES El Punching. D.L.P. Major DRAWING MATERIALS Has a Sin. Parallel Jaw Vice. Screw -cutting up to2in. diameter. Fitted with geared, detachable handle. DRAWING OFFICE Istr,li D.L.P. Minor 000 13 STATIONERY Parallel Jaw Vice. Screw -cutting upto Whit,in. gas, I