The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 471
IP, IJfV. -^ Fig. 124. factorily satisfy the conditions as to rigidity and convenienceof centring. Of course it should stand vertically over the sta-tion so that a reading could be taken on any part of itsheight. The last condition is not so easily satisfied. If acylinder or cone be used the…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
