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 511
t of small distances or angles, when the required exact-ness is greater than can be obtained by means of a vernierscale. It is usually combined with a microscope, the microme-ter threads and scale lying in the plane of the image producedby the objective. This image is always larger than the… … Fig. 135. * Yrom Jilum, thread; micros, small, and metros, measure. The thread is inthis case a spiders web, or scratches on glass. GEODETIC SURVEYING. 481 The frame holding the movable wires has a screw with avery fine thread working in it, called the micrometer screw.This screw has a graduated…
Surveying
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