A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 388
he point has reached C, they have the same values as at A. They then begin to increase again, and so on.Table on page 382 indicates these variations. The sines and tangents of very small arcs may be regarded as sensibly propor-tional to the ares themselves ; so that for sin. a, we may write a. sin.… … The • Consequently, the note on page 379 may read thus: The number of seconds in any very small•re given in parts of radius, radius be-ig unity, is equal to the length of the arc so given dividedby sin. 1 382 TRIG0\0.1IETRY. lAPP. A, a being the length of any arc expressed in parts of radius, the…
Surveying
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