The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 512
or disk, attachedto it, there usually being sixty divisions in the circumferencewhen used in angular measurements. The number of wholerevolutions are recorded by noting how many teeth of a comb-scale are passed over, this scale being nearly in the plane of thewires and therefore in the focus of the… … Fig. 136. Fig. 136 is a sectional view of a filar micrometer. The graduat-ed head h is attached to the milled head m, forming a nut intowhich the micrometer-screw a works. This screw is rigidly at-tached to the frame b, to which are fastened the movable wires/. The comb-scale s and fixed wire / are…
Surveying
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