Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 24
r measuringsmall lengths with precision is the micrometer screw. It is used under variousforms, but the principle is the same in all, and may be conveniently illustratedby reference to the spherometer. 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 circular disc attached to the screw is graduated at the periphery into any given number of parts, say 500, andis turned by a milled head…
Physics
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