Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 92
587.61 2.769093 m. To determine the perpendicular distance of an object below agiven horizontal plane. 46. Suppose C to be directly overthe giyen object, and A the pointf through which the horizontal planeis supposed to pass. Measure a horizontal base-line AB, and at the stations A and Bconceive… … 90 ELEMENTS OF SUEVEYING. [BOOK H. triangles are the distances from the horizontal lines AC, BC,to the object. If we turn the triangles about their bases AC,BC, until they become horizontal, the object, in the first case,will fall at C, and in the second at C. Measure the horizontal angles CAB,…
Surveying
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