A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 153
134: LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. (210.) On a Sea-coast. The position of the boat in thewater, when the soundings are taken, must be determined atregular intervals. This is done in various wavs. (211.) From the Shore. By observing with a compass ortransit to the boat from stations… … Its place is then fixed as in Art. (232). Two observersare necessary. Three are better, as the third checks the othertwo. This is accurate in theory, but not in practice, simulta-neous observations being impracticable, and confusion fre-quent. Also, more men are required. (212.) From the Boat with…
Surveying
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