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 392
FICULTIES. 377 sights unequal in the contrary direction till the differences oflengths balance the former ones. When approaching a long ascentor descent, make these compensations in advance. In leveling over a line of stakes already set, as on a railroad, atevery 100 feet, if the line of sight… … ment on the top of the hill or bottom of the hollow, time will besaved by the method represented in Figs. 402 and 403. Fig. 403.
Surveying
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