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 142
124: LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. (195.) Otherwise. At A set off an angle, asCAD (ADbeing a prolongation of AB). Then walk along the line A Cwith the index set to half that angle, looking at A directly,and B by reflection, till yon come to some point, 0, at whichthey coincide. Then…
Surveying
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