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Aviation History
1951
1951 - 2219.PDF
2 NOVEMBER PRECISION FACTORS CONTRIBUTING TO ENGINE EFFICIENCY Cylinder sleeves are inspected for size andovality using "Solex" pneumatic gauges. Inspecting cylinder sleeves for size and ova Air at a controlled pressure is fed through a small orifice to the gauge, which may be a ring, as illustrated, for measuring the exteafflsal dimensions, or a plug for the bore of th,e.sleeves. The air emerges from two small holes in opposite sides of the gauge, and bleeds away at a rate depending on the clearance between gauge and component. The air pressure between the orifice and the gauge depends on the magnitude of the air leakage, j and gives an accurate indication of the difference in size between gauge and component which is measured on a manometer calibrated in steps of 0.0001 inch. This is one of a great number of precision instruments which are used in the "Bristol" workshops., Sleeve-valve and turbine engines for reliability THE BRISTOL AEROPLANE COMPANY LIMITED nonty ENGLAND 961*. 1
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