Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 83
PROBLEM IV. To find the altitude of an object, when the distance to thevertical line passing through the top of it is known. 102. Let CD be the alti-tude required, and AC theknown distance. From A, measure on the line AC, any convenient ^i ,.■ … B distance AB, and place a staff vertically af, B. Then placing the eye at A, sight to CONTENT OF GROUND. 79 the object D, and let the point, at which the line AD cutsthe staff BE, be marked. Measure the distance BE on thegtaff; then say, As . AB : BE : : AC : CD,then, CD becomes known. If the line…
Surveying · Navigation
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