Portable instrument for measuring surface finish under workshop conditions weighs 13 lb, measures 11 in. x 11 in. x 7 in. and can be set up alongside machine, on inspection bench or anywhere power supply of 110-x 245 v, 40-100 cps is available; it comprises piezoelectric pickup with sapphire stylus, set of reference surfaces, and selective amplifier giving direct reading on four scales.
Philips roughness tester
Automobile Engr
Automobile Engineer ; 46 , n 4
1956
2 pages
Article (Journal)
English
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