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Scientific American, Vol. 57, No. 19 (1887) (1887)
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side and outside vernier calipers, and gauges ‘for depth, and for screw cutting, both male and female, ‘are kept here in cases. There is much of value to be derived from their examination, and more space than is at our command might be devoted to them. They represent a complete set of mechanical… … photometer, on which incandescent lamps are tried to © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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