Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 78
/. / : i ft --JjJ … Fig. 67 If two objects are not in the same horizontal plane witheach other or with the point of observation, we may supposevertical lines to be passed through the two objects and tomeet the horizontal plane of the point of observation in twopoints. The angular distance of these two points is the…
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