A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 113
ubbed out. The rows of hatchings must neither overlap 94 LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. nor separate, and the lines should be made slightly tremulous.When they are put in without contour-lines to guide them,take care never to let two rows run into one; for the breaksbetween the rows… … ill!! (158.) Degree of Shade. The steeper the slope is, the lesslight it receives, in the inverse ratio of its length; i. e., in-versely as the secant of the angle a whichit makes with the horizon, or directly ascos. a. Then the ratio of the black to thewhite is, : : 1 — cos. a : cos. a. In…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
