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Aviation History
1939
1939 - 1427.PDF
.488 - FLIGHT. MAY II, 1939 STOP- -•-SHANK •LOCKNUT Positive Countersinking IN aircraft work especially, accurate countersinking of drilled holes is often necessary. If the required degree of accuracy is to be obtained without an undue expenditure of time, some positive method of limiting the depth of countersink is desirable. The tool illustrated here, for use in metal, wood, fibre or plastics, employs a simple adjustable depth stop. The shank or main shaft has a taper at the lower end to carry different sizes of cutters, the other end being threaded for half the length of the shaft; at this end, also, the shank is reduced and left plain for the purpose of fitting into the chuck of a machine or brace. Screw ing up or down the shank is the stop, threaded half its length, the re mainder being drilled out to a larger diameter to allow for swarf. A lock- nut prevents the stop moving from its set position, while a tapered guide or drill is fitted into the lower end of the shank to ensure that the tool runs true. The stop may be adjusted to the smallest fraction of an inch. This tool, with the stop and lock-nut removed from the shank, can also be made into a tool for drilling and spot facing in one operation. Mr. Philip Thurston, 76, Windsor House, Victoria Street, London, S.VV.i, is the inventor. CUTTERH GUIDE The components of the Thurston countersinking tool. Engineering Exports Tj'ROM whichever angle the world situation is viewed, the all- J- important factor of export markets forms the background against which rival national policies jockey for position. Ex port subsidies, trade delegations, treaties and pacts all speak of the urgent methods which are being employed It is a tribute to British manufacturers that by the employ ment of the more orthodox methods they have in many im portant categories not only maintained but increased their exports. Many of our leading industrialists, looking beyond the present time of high-pressure production for government need, are anxiously surveying export possibilities of expansion. Valuable guidance in this direction is provided in practical form by a detailed survey of engineering exports for 1938 classified under 102 headings and covering 111 markets, just issued by The British Engineers' Export Journal in collaboration with H.M. Customs and Excise. It is obtainable from Dorset House, Stamford Street, London, S.E.i, price 10s. 6d. THE INDUSTRY American Bearings in England FOLLOWING the recent visit of Mr. E. J. Jack to America comes the announcement that his company, E. J. Jack, Ltd., 11, Camden High Street, London, N.W.i, will in future handle all the productions of the Fafnir Ball Bearing Company of New Britain, Connecticut. The agency will handle all types of bearings made for use on aircraft. Hampden-Dowty Hydraulics IT is only to be expected that much of the specialised hydraulic equipment in the Handley Page Hampden should be entrusted to such an experienced firm as Aircraft Components, Ltd., of Arle Court, Cheltenham. This com pany, under the leadership of Mr. George Dowty, designed and supplied the parts necessary for the hydraulic operating units, retracting gear, etc. Steel Bar Specifications TO-DAY the aircraft designer is faced with the difficulty of keeping track of an abnormally large number of different steel specifications. For this reason the reference book of the Kirkstall Forge, Ltd., of Leeds, 5, is certain to find a useful niche in the files of aircraft constructors' drawing and stressing departments. Although this 120-page book is primarily intended for the technician, the student will find it self-explanatory. The first third of the book is devoted to the Company's production methods and processes. Over 150 questions are answered for those who would like to understand the phraseology connected with steel. Finally, many pages are devoted to detailed specifications and tables connected with different types of steel bar. Storage Tanks with a Watery Lining ON Tuesday, May 23, M. Brice, of Sainrapt and Brice, the well known French firm of reinforced concrete consultants and engineers, will give a lecture in London on the use of patent " water wall " storage tanks for liquids of the hydro carbon category. This system has been developed in France by La Paroi Hydraulique, who have built tanks capable of holding over 2,000 tons ol fuel. The tanks are built of porous concrete through which water seeps, virtually providing a continuous seal of water of the thickness of the floor, walls and roof. The fact that the concrete is so water-filled, and the difference in the specific gravities of the two liquids, prevents any tendency for the fuel to enter the concrete or for the water and fuel to mix. Again, it is claimed that the fuel stored is not liable to the acute temperature variations which in the normal metal type of tank produce changes of pressure of the fumes above the liquid. Although this design of tank was originally intended for petrol, it is suitable for any liquid which does not mix with water. Further details of this type of tank and of the lecture t'. be given by M. Brice arc obtainable from Inter national Technical Developments, Ltd., Thames House, Mill- batiK, London, S.W.i. HAvrrxANDWAIRCRAFT OF CANADA X - - i£ CANADIAN RESOURCES : Since the formation of De Havilland Aircraft of Canada Ltd. at Toronto in 1928, increased business has necessitated a corresponding expansion of the original works. Last December the extensions to the plant were completed. At the back of the hangar-type shops there is a frontage of offices. The factory is now capable of producing between 300 and 400 aircraft per annum from raw material.
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