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 496
observed, to determine whetherit is his upper or lower limb whose altitude has been observed, pro-ceed thus : Having brought two limbs to touch, push the index-arm fromyou. If one image passes over the other, so that the other twolimbs come together, then you had the lower limb at first. If… … 715. To observe very small altitudes and depressions with theartificial horizon : Stretch a string over the artificial horizon. Place your head sothat you see the string cover its image in the mercury. Then theeye and string determine a vertical plane. Then observe, looking at the string by direct…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
