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Aviation History
1952
1952 - 2060.PDF
jp0SHf PRECISION FACTORS CONTRIBUTING TO 25 JULY 1952 ENGINE EFFICIENCY Optica Inspection of 1 The instrument illustrated makes possible rapid and accurate inspection of the profile and blade angle of compressor and turbine blades. The system is an optical one, and was invented by "Bristol" employees. It gives a magnified image irw 0 e 0 s HTVI 1 of the blade profile which is compared with a master form traced on a viewing screen (see illustration left). The instrument is housed in a darkened cubicle, and the blade is set up so that the section to be inspected is illuminated by a narrow band of light from six lamps surrounding the blade. A lens near the tip of the blade and co-axial with it, projects the image of the illuminated blade section on to the screen, where it appears as a dark shadow surrounded by a band of light. The magnification may be varied, but is normally 20 diameters so that any errors are easily detected. This is one of many precision instruments used in the manu facture of "Bristol" turbine engines. Illustration shows viewing screen with image in white outline and master form in black dash outline. Sleeve-valve and turbine engines for reliability THE BRISTOL AEROPLANE COMPANY LIMITED nomy 997E ENGLAND
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