A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 402
evel or plumb line. By these is measured thedesired vertical angle made by the inclined line with either alevel line or vertical line. This inclined line may be an actual line or a visual line. In the former case, it may , -, -, Fig. 416, be a rod, or cord, or wire, as shown in Figs.416-418. This… … Fig. 417. Fig. 418.
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-445-216.webp)
