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 233
8 PHOTOGRAPH y ^PPLIEP) TO SURVEYING. embracing points on the other two views, would serve to check the accuracy of the plot. To avoid repetition, the orientation of the views, or the determination of the required directions of OP and the consequent positions of HH' for the different views, is… … Fig. 8. and a' a being measured on the view, and OA' measured on the plot; then Oa' \ OA' lla'a : A' A, whence A' A = °A "\ denoting A' A by H, and OA' by D, and since is the tang. @ (see figure) to the radius Oa', there results the general expression for the reference of a point H= ± D tang. @;…
Topographical drawing · Photographic surveying
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
