A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 99
closed in a brass case, and furnished with ver-niers, thermometers, etc., as in the preceding form. Itis carried inverted, to avoid breaking. The best is Gay-Lussacs, improved by Bunten. 1 For a complete description, see Tenth Annual Report of Smithsonian Insti-tute. 80 LEVELLING, TOPOGRAPHY, AND… … expanded by a spring inside. This motion is communicatedby suitable levers to the index-hand, on the face, which indi-cates the pressure of the atmosphere, the face being graduatedto correspond with a common barometer. It is much used on account of its portability, but is not asreliable as the…
Surveying
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