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 191
eres to the grease, and thus showsthe nature of the bottom, which should beentered in the field-book, and laid downupon the map. As the cord is liable tochange its length, it should be compared,from time to time, with some standard.In tide-waters, the exact time of each sound-ing is to be noticed,… … SEC. IT.] MARITIME SURYEYTNG. 189 means of a spirit-leyel, to some fixed bench-mark, on a levelwith mean low-water mark, to which all the soundings mustbe reduced. 157. Haying plotted the work done with the theodolite, asalso the outline of the harbor traced with the compass, it re-mains to…
Surveying
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