Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 207
cal distance which is obtained by the calculation, is estimated froma horizontal line passing through the eve at the time of ob-servation. Hence, the height of the instrument is to be added,in order to obtain the true result 8ECOND METHOD. When the nature of the ground will admit of it, measure… … of the angles A andABB, it follows, thatthe angle ABB isequal to the differenceof the angles of ele-vation at A and B. Hence, we can find all the parts of thetriangle ABB. Having found BBy and knowing the angleDBC, we can find the altitude BC. This method supposes that the stations A and B are…
Geometry · Plane trigonometry
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