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 104
tin cone set on the staff can be seen at a great distancewhen the sun is shining. 137. Banging to a point thus made conspicuous is very simplewhen the ground is level. The surveyor places his eye at the near-est end of the line, or stands a little behind a rod placed on it, andby signs moves an… … -~^B i38. Across a Valley. When a valley or low spot intervenes between the two ends of the line, A and Z in the figure, ^ FlG- 109- a rod held in the low place, ft^i as at B, would seldom behigh enough to be seenfrom A, to cover the dis-tant rod at Z. In such acase, the surveyor at A should hold…
Surveying
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