Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 104
m pitch, called micro-meter screws. The interval between the wires, in termsof the distance between two consecutive threads of thescrew can be read oh* by means of a suitable scale, and fromthis the angular distance between them can be found bya simple computation. In the position micrometer the… … Fig. 43. The Position Micrometer. Description. In Fig. 43, aa is a longitudinal wire attached to theperforated diaphragm of the instrument in such manner that it alwaysintersects the line of collimation at right angles. The parallel wiresc and d are perpendicular to aa, the former being attached to…
Astronomy
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