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Aviation History
1931
1931 - 1228.PDF
FLIGHT, NOVEMBER 20, 1931 contact with the cylinder underuniform pressure. One method of overcoming this would be tomake the ring of varying thick- ness, but obviously this is im-practicable ; therefore, another method is used, and that is toimpart to the ring, in its fret- state, such a curve that it willclose in a perfect circle. This curve is obtained by internalhammering, the intensity of ham- mering being greatest oppositethe slot. The effect of this ham- mering, however, tends to weakenthe ring, and although it has so far proved a practicable method,there is investigation being •carried on to evolve a methodwhereby the ring may be formed to the correct shape in the firstplace. At present such a proce- dure is far too costly for it to bea commercial proposition, but it certainly has decided advantagesand may become general practice before long. A visit to the Brico Worksshows at once the care which is taken to ensure that the finishedarticle is of the highest quality— it wouldn't be used in aircraftwork if it wasn't! Inspection is made at every single stage ofmanufacture, the inspection de- partment is exceedingly well organised, and there is acheck department as safeguard, though it is said that this latter has never found anything to quibble about! So great is the demand for Brico cast-iron parts (forthe factory makes many other articles besides somewhere about 5,000,000 piston rings a year! as, for example,cylinder liners, valve guides, tappets, valve seatings, gudgeon pins, brake-drum liners, pistons, and in fact anypart of a motor which may be subject to wear and, there- fore, require replacement) that in recent years the wholefactory has been greatly extended, and now a new foundry Centrifugal casting machine. A is the mould, B the cover plate which determines the thickness of the metal, C the ball-bearing support for B, D the headstock carrying mould spindle, E, funnel, and F, channel, along which the metal flows into the mould. is about to be placed in commission on a new 14-acre plot.The original factory started in 1909, when Mr. W. A. Oubridge founded the British Chuck & Tool Co. In 1911so much progress had been made that it was decided to build a new works at Sandy Lane, the original ones beingin Bishop Street, and here the foundry was erected along- side the machine shop. In 1914 a further advance wasmade with the factory at Hoi brook Lane, which concen- trated solely on piston rings. Now the new and latestfactory is being built—all in 22 years! Surely a wonderful record for British piston rings. A view of the centrifugal casting machine foundry of the British Piston Ring Co., Ltd., at Coventry. Imperial Airways : Chairman's Speech THE speech delivered by the Chairman, Sir Eric<5eddes. of Imperial Airways, at the Seventh Ordinary General Meeting on October 15 last (to which reference hasalready been made in FLIGHT), has now been printed in a brochure issued by Imperial Airways, Ltd., from AirwayTerminus, Victoria Station, S.W.I. This brochure, which is neatly produced with illustrations, is available to any ofour readers who may be interested on application to Imperial Airways, Ltd. 1158 I
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