Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 24
measuring-small lengths with precision is the microineter screw. It is used under variousforms, but the principle is the same in all, and may be conveniently illustratedby reference to the spherometcr. This consists of an accurately turned screwwith a blunt point which works in a companion… … Fig. 2. This distance may be accurately determined by measuring a given length ofthe screw by compasses, and counting the number of the threads in thislength. A milled head attached to the screw is graduated at the peripheryinto any given number of parts, say 500^Suppose now the distance between…
Physics
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