Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 67
In measuring up the hill fromA to 0, or down the hill fromC to A, we measure the horizontaldistances a t, c d, and / C, andtheir sum is the liorizontal dis-tance between A and C. Two staves are often used w^th the chain, in the measure-ment of lines. Each of these should be about six feet inlength,… … SEC. I.] MEASUEEMEXT OF DISTANCES. 65 Sta>dard. 21. As the length of the chain may vary, from heat orcold, or become changed from other causes, it should be com-pared from time to time, with a standard, kept for the purpose. To facilitate this comparison, let two stakes be driven inthe ground,…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)](https://img.insideoutlibrary.com/img/200/ia-62523189.5956.emory.edu-512-114.webp)
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-45-79.webp)