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 139
tting the Triangles.- The following method of plotting the triangles by rectangular coordinates is described in addition to that given in par. 57, because of the complete system of checking afforded in the computations. If it is desired that the direction of measurement shall be S. W. N. E., the… … origin to B ; z" , the azimuth of BA, is z — 1800 ; and since the measurement may be made from either extremity, the general expression is z" = z ± 1800. For BC, a left-hand side with reference to BA : z'" = z" + ABC— ABC being known. Transferring the origin to C and producing the sides AC and BC w…
Topographical drawing · Photographic surveying
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
