A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 233
changes. The angle thus observed is in terms of turns and divisions ofthe micrometer screw, hence, in order to obtain it in arc, the valueof the screw in seconds of arc must be obtained. This is doneeither by measuring an angle accurately determined by means ofthe horizontal circle or other angle… … results, and would be of more general advantage, since greaterdifferences could be measured with it than with the ocularmicrometer. METHOD OF OBSERVATION. 223 For a method of combining micrometric angles with zenith dis-tances, see page 237. 732. Vertical Circle. The vertical circles in use at…
Surveying
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