Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 81
.Thus, FG drawn through the middle point of AB, is themeridian distance of the line AB. The sign -f- will always be given to the meridian distanceof a point or line, when it lies on the east of the assumedmeridian, and the sign —, when it lies on the west. 74 ELEMENTS OF SURVEYIIi^G. [book III.… … FiG. 58. levels placed at right angles to each other ; a brass head, K, to fitthe compass to a stand, which is sometimes a tripod and some-times a single staff, called Jacob-staff, pointed with iron at thelower end so that it may be placed firmly in the ground. 109. The compass-box DCE is circular,…
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-electricengineer01inte-164-66.webp)
