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
Z. Any number of intermediate points can thusbe interpolated, or placed in line between A and Z. 139. Over a Hill. When a hill rises between two points and prevents one being seen from the other, as in the figure (the upper „ ,„„ part of which Fig. 110. shows the hill inelevation, andthe lower… … 90 LAND-SUB VEYim. beyond him. B looks to Z, and by signals puts C in line.C then looks to A, and puts B in line at B. B repeats his oper-ation from B, putting C at C, and is then himself moved to B,and so they alternately line each other, continually approxi-mating to the straight line between A…
Surveying
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