Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 43
the spectator. This change, enables us to ascertain the dis-tance of the object with much precision, for supposing A andB joined by a line, we have a triangle ABC, in which one side AB, is known, and all three angles — for the observers at A and Bdetermine with some graduated instruments, the… … Suppose a spectator at B, to observe by means of a graduated MEASUREMENT OP DISTANCES. 41 circle, the number of degrees subtended by a distant object,as a church, at A C, and let this angle be two degrees ; we havehere a triangle ABC, and knowing its angles, and any oneside, we can determine the…
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