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 328
class of instrument consist indetermining, first, the distance on the slope, and then the hori-zontal and vertical angle without taking account as a separateobservation of the space subtended on the rod from whichthe inclined distance is determined. From these data theazimuth of the desired point… … Fig. 83.—Wagner-Fennel Theodolite Tachvmeter. distance. These he sets off ujion the rule parallel to the lineof sight, pressing the projection angle against the vernier of 282 ANGULAR TACHYMETRY. heights, and from the latter reads the required height, andfrom the horizontal rule the reduced…
