A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 507
ed andrecorded. Stations on the water are marked by buoys. A buoy may bemade of a light wood float, in which is a hole for the flag-pole.The float is anchored with a stone, or by some other means. 728. The position of the station-buoys, and of the boat whensounding, is determined in various ways.… … A B, and the angles which the lines of sight make with it wouldthen be known, and its place would be fixed by angular co-ordi-nates. Two observers are necessary. 730. From the Boat with a Compass. Observe from the boatwith a prismatic compass, or a Burniers compass, to two signals on SOUNDINGS. 493…
Surveying
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