A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 405
float is anchored with a stone, or by some other means. Stations may be marked in shallow water in the same way as onthe land. On rocky precipitous coasts signals may be painted on therocks. 394 MARITIME OR nYDROGRAPHIC SURVEYIXQ. 826. Soundings are usually made on parallel lines, at rightangles to… … soundings are to be taken may be determined by paying out a ropeor wire, and directly measuring the distances, or by rowing steadilyand taking soundings at equal intervals of time. The latter is theusual method. In this case the whole distance passed over and thetime employed must be known, and…
Surveying
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