Manual of modern surveying instruments and their uses .. (1893)
Lietz, firm, math. instr. makers, San Francisco. (1893. The A. Lietz company) [from old catalog] · [San Francisco] The Company · leaf 126
f two blacklines on the heads of the lever, h h, and the hair-spring, e e, observed by means ofa magnifying glass, L. The scale, S S (Fig. 3), gives the full revolution of themicrometer screw. The first instruments of this class were provided with a scaleon which the readings increased with the… … THE A. LIETZ COMPANY. 97 the mercurial barometer. Each revolution of the micrometer screw corresponds to10 mm. of the mercury column, and the head of the micrometer screw is decimallygraduated, admitting of accurate reading to the one-hundredth part of a millimeter. The usual size of this…
Surveying
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