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 509
t 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 objectitself in microscopes, and therefore a given movement of thewires in the micrometer corresponds to a very much less… … 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 cylindrical head, or disk, attachedto it, there usually being sixty divisions in the circumferencewhen used in angular measurements.…
Surveying
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