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 500
ading the lighting may be takenfrom one of two directions. If vertical, that is, from above,no high lights are introduced, but the highest summits havethe lightest tint. The better and more commonly acceptedmethod of shading is to assume that the light comes from anangle of 45° to the left, or, in… … u CONTOUR LINES. 455 office from such a sketch map, the altitudes which have beendetermined everywhere give points upon which connectedcontour Hues can be constructed by following the forms in-dicated by the sketch contours. Crayon or briisJi shading bears about the same relation tohachure drawing…
