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 125
rom the north or south points ofthe magnetic meridian. Then turn to any other object and repeatthe operation ; the difference between the bearing of this object and that of the former will be theangular distance of the objects inquestion. Thus, suppose theformer bearing to be 40° 30, andthe latter… … THE COMPASS. HI card are reversed or written upside down, as in the figure (inwhich only every fifteenth degree is marked), because they arcagain reversed by the prism. The prismatic compass is generally held in the hand, the bear-ing being caught, as it were, in passing; but more Accurate…
Surveying
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