A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 337
compass differs from the ordinary compass, Fig.135, in having a solar apparatus, instead of a magnetic needle, for determining the meridian. 322 LAND-SURVEYING. In the figure, a is the latitude-arc, whose center of motion is intwo pivots, one of which is shown at d. It is furnished with aclamp,…
Surveying
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