A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 287
ed by aspring inside. This motion is communicated by suitable levers tothe index hand on the face, which indicates the pressure of theatmosphere, the face being graduated to corresjjond with a commonbarometer. 276 BAROMETRIC LEV ELI XG. There are several varieties of this instrument, differing… … are much used on account of their portability, but are not as reliableas the mercurial barometer. Approximately, a difference of reading of ^^-(5- of an inch cor-responds to a difference of height of nine feet. The following tableis more nearly accurate : JtEAI7 TEMPXBATUBB. 80° 40° 50° 60° 70° 80°…
Surveying
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