A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 255
erscrew, S, works. This screw abuts, through a small cap, againstthe top of the opening between the guide pieces of the upright. 24:4 PRECISE SPIRIT LEVELING. thus enabling the observer to raise or lower that end of the super-structure at will. Tiie micrometer screw is made of steel, and hasforty…
Surveying
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