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Aviation History
1932
1932 - 0018.PDF
FLIGHT, JANUARY 1, 1932 K.L.G. plugs are widely used in aircraft and those here illustrated are (.left) the V .4.B and (right) the 633. The latter is made specially for such engines as the Gipsy and has a very small body. These aircraft plugs are beautifully finished and tested under extreme con ditions to Air Ministry specifications before they are passed as fit for aircraft use. FIT AND FORGET I/\L.G. Aero Sparking Plugs have " been developed to stand the arduous conditions found in modern aeroplane engines, and as most pilots will admit they seldom give any trouble even during long periods of full throttle work. A few details of their construction should therefore prove of interest. To start with, mica is used for the insulation as it is one of the few substances with which absolute uniformity can be obtained ; moreover, it is a material which may readily be turned into any desired shape. This is a point of which good use is made inside the plug where the insulation is exposed to the heat and oil of the engine ; here it is shaped into a stepped cone whose sharp edges prevent an accumulation of oil or carbon on the surface which would, if allowed to grow, cause the plug to cease func tioning. Another feature which en sures that the plug will continue work ing under really trying conditions is the coating of copper which is fitted over the central electrode; this copper, being of high heat conductivity, cools the electrode as well as assisting in cooling the mica installation. «' COANA1LIUM "—A SPECIAL ALLOY ""TO MEET the increasing demand for 1 an aluminium alloy that will re sist the action of sea-water and damp atmospheres, a special aluminium alloy- known as " Coanailium " has been produced by Robert W. Coan, Ltd., The Aluminium Foundries, Coan House, Duncan Street, Islington, London, N.l. This alloy has been subjected to a six-months' sea-water test in the ebb and flow of tides and passed it successfully. A report upon its tensile strength in bar form from the A.I.D. Test House at Kidbrooke was as follows: — Yield per sq. in., 10.80 tons. Tensile per sq. in., 13.28 tons. Elongation, 8.5 per cent. Brinell hardness No., 69.1. This Company is engaged upon the production of castings for gun mount ings, crank cases, pistons, carburet tors, clinometers, barometers, joystick controls, wireless instruments, and numerous other parts for engines and aircraft. During the war many tons of aluminium castings were produced in their foundries every week, and they count as one of their best achieve ments the die casting of a 36-in. dia meter scarf gun ring. Experts did not believe this method practicable with so difficult a pattern until Mr. Coan, the founder of the business, proved it, and, incidentally, solved the problem of the acute shortage prevailing at the time. Over 20,000 were produced and gave entire satisfaction. It is hardly necessary to stress the value of a light, strong alloy that will also resist sea-water. The introduc lion, therefore, of " Coanailium " into this specialised field is of con siderable value to manufacturers ot sea-going aircraft. THE "SOLON" IRON AMONG the suggestions for Christ- ** mas made in " The Industry " in FLIGHT for December 11 was the " Solon " Electric Soldering Iron. This iron (which is marketed by Brown Bros., Ltd., of Great Eastern Street, E.C.2) does, if one is to judge from the number of inquiries about it, fill a want in a most satisfactory manner. This is not surprising when it is realised how much simpler soldering is made bv using an electric iron of this type with its constant supplv of heat, and at a retail price of 7s. 6d. it is undoubtedly a very good bargain. INDISPENSABLE FOR TESTS A STRUT THERMOMETER is in- ** valuable for test purposes on air craft, and may be used with great advantage when on cross-country flights where a sudden change of air temperature will signify a change in wind direction to the meteorological - minded pilot. Such an instrument is usually large, but in some cases it may also be light, and the type which is marketed by S. A. Calderara, of Springfield Works, Springfield Gar dens, Clapton, E.5, is a particularly good example of this. SALESMANSHIP LJENLYS, LTD., who are agents for ** Avro aircraft at Heston Aero drome, Middlesex, are now offering free flying tuition to the purchaser of any aircraft from them. They supply not only " Avians," but also every make of new light aeroplane on the market, and in addition have a stock of reconditioned second-hand machines. Any of these may be bought on the hire-purchase system, or, if desired, motor-cars will be taken in part exchange. The flying instruc tion scheme entitles the purchaser to receive eight hours' dual instruction from the instructors at the Airwork School of Flying, Heston, and this in struction will be given on the pur chaser's own machine. In addition, there will be one hour's free training in air pilotage at the Ferguson School of Navigation, which is operated by Capt. G. W. Ferguson, in order to supply amateurs with sufficient know ledge to find their way about the country under varying conditions. A small brochure is available from Henlys for those who write mention ing FLIGHT, in which will be found full details of the scheme, together with a good deal of other information concerning flying matters. AN OIL TRADE CHANGE CILVERTOWN Lubricants, Ltd., of ^ Minoco Wharf, London, E.16, inform us that Mr. Arthur Stephens, who has energetically managed the business since 1921. severed his con nection with the company as from the beginning of December, in order to join a new undertaking. We are sure that Mr. Stephens' many friends in the lubricating oil trade will wish him well in whatever future task he undertakes. FOR HEAT TREATMENT C" LECTRICAL furnaces are already *-"• widely used by aircraft manufac turers for the. heat-treatment of steels and light alloys, and, in fact are a necessary part of the workshop equip ment of any manufacturer whose con struction includes aircraft built in metal. G.W.B. and Wild-Barlield electrical furnaces and ovens are widely used for this purpose. A matter of interest is the news that the makers of these furnaces, G.M.B. Electrical Furnaces, Ltd. (Gibbons Bros., Ltd., and Wild-Barfield Electrical Furnaces. Ltd.), of Elecfurn Works, North Road, Hollowav, London, N.7, have entered into an arrangement with the Demag Elektrostahl G.m.b.H. of Dusseldorf, whereby the former will have the sole selling rights of the Demag Electric Aluminium Melting Furnaces in the British Isles. These melting furnaces are particularly suitable for everyone who deals with light alloy and alu minium castings. They are at present available up to a capacity of about 2 tons with an in-put of 500 kilowatts. MECHANICAL PROPERTIES OF NICKEL ALLOY STEELS TNDER this title a very useful ^ booklet has been issued by The Mond Nickel Co., Ltd. It contains a convenient summary of the mechanical properties of a large range of nickel alloy steels, the specifications and tvpical properties of which are given.
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