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 388
always at every half-mile or mile. The precise location and description of every bench-mark shouldbe noted very fully and precisely, and in such a way that an entirestranger could find it, with the aid of the notes. 545. Check-Levels, or Test-Levels. No single set of levels is tobe trusted ; but… … 374 LEVELING. 546. Limits of Precision. Errors and inaccuracies should becarefully distinguished. For the latter, every leveler must make astandard for himself, so as to be able, in testing his work, to dis-tinguish any real error from his usual inaccuracy. The result of four sets of levelings, in…
Surveying
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