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 61
sponding to the equidistance and the scale of the map ; and lines perpendicular to MN are drawn at convenient intervals to assist the eye in determining vertical directions. In use, it is so placed upon the map that the edge MN coincides with the line, as HH' , along which the section is required.… … ever, would be to join the points by a right line ; then, at the only points of it which from inspection could obscure the view, erect perpendiculars to this line ; lay off on each its corresponding height as given by the contours, and apply a straight-edge, as above, to the outer extremities. An…
Topographical drawing · Photographic surveying
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
