Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 27
ipal uses of this instrument is to lay off ona line, a distance equal to a given line. For example, to lay off on CD a dis- ^ ^ tance equal to AB. * For this purpose, place the forefinger C ^ n on the joint of the dividers, and set one foot at A: then extend, with the thumb and other fingers,the… … 20. A Ruler of a convenient size, is about twenty inchesin length, two inches wide, and a fifth of an inch in thick-ness. It should be made of a hard material, perfectly straightand smooth. The hypothenuse of the right-angled triangle, which isused in connexion with it, should be about ten inches…
Surveying · Navigation
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