Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography (1905)
Wilson, Herbert Michael, 1860-1920 · New York : J. Wiley · leaf 228
e. Thisshould, so far as practicable, be accomplished by the methodof intersections. This is accomplished by previously occupy-ing known positions and by constructing a graphic triangula-tion on the plane-table board from these, including unknownpositions which are platted in the course of the… … T I ^T Fig. 58.—Intersection with PuANE-TABLt. 184 PLANE-TABLE TK lAKG ULATION. and oriented approximately by eye by ranging the lines fromp towards a, b, cxw the directions of the corresponding signals,A, B, C, the edge of the alidade is placed on the \ine/>a, and,the horizontal motion being…
