Article cites strides made in illumination standards for workshops, from 5 candles/sq ft up to present 25 to 50 ft candles; illumination factors in testing of flat surfaces by means of knife edge; use of magnifying glasses and binocular devices; lens aberrations encountered; role of microscope and telescope; optical aids in projection of form gages.
Optical methods of inspection
Eng Inspection
Engineering Inspection ; 10 , n 4
1945
2 pages
Article (Journal)
English
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