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 66
when the ground slopes, one end of the chain must be ele-vated. Each chainman should be provided with a small plumb-line, so that the elevated end of the chain may be held directlyover the proper point. When the raised end of the chain is only two, or eventhree feet above the ground, it will… … Suppose the chaining to be w^j Mil. The fore-chainmandraws the chain out to its full length, as in any other case,and then returns to within such a distance of the hind-chainman, that when the chain is drawn out to that lengthhorizontally, it shall not be too high to be held conveniently. The…
Surveying
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