Topographical drawing and sketching : including applications of photography (1888)
Reed, Henry A. (Henry Albert), 1844-1930 author · New York : John Wiley & Sons, 15 Astor Place · leaf 231
PHOTOGRAPHY APPLIED TO SURVEYING. … Fig. 5. jected into the plane of the horizon, the angles included by the projections of the visual rays are the true horizontal angles; the same that would be measured with a theodolite or any other horizontal angle-meas- urer:— Thus, in Fig. 5, OP and HH' , since they are in this plane, are their…
Topographical drawing · Photographic surveying
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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