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 86
. 41. Let OA be the line tobe prolonged. Lay off GAB= 120°, or CAB = G0°. Meas-ure AB, of such length as topermit BC to be measuredwithout meeting the obstruc-tion. Make ABC =60°, andmeasure BC, equal to AB. IfA be not in sight from C,make the angle BCF equal to 120, and resume the survey ofthe… … 84 ELEMENTS OF SURVEYING. [BOOK II. tlie 90-link point, let two assistants draw out at the 30, andat the 60 point, until the three lines are straight. V. To find the altitude of an object, when the distance to thevertical line passing through the top of it is known. 42. Let CD be the altitude…
Surveying
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