Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 55
tsthe links. In measuring up the hill fromA to C, or down the hill fromC to A, the horizontal distancesahf c d, and / C, are measured andtheir sum is the horizontal dis-tance between A and C. Chaining doion hill gives moreaccurate results than chaining up ; for in chaining down, thefollower holds… … Fig. 31. 72. When the ends of a line can not be seen, each from theother, intermediate points between the two must be established.When a hill intervenes, such points may be established thus : letthe surveyor and an assistant, each with a ranging-rod, placethemselves as nearly in the line as…
Surveying
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