A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 100
ed, andthey wiU thus form a very complete series of tie-lin«s.* A view of the district to be surveyed, taken from some elevatedposition, will be of much assistance in planmng the general direc-tion of the lines to be measured. (134) Inaccessible Areas. A combination of offsets andtie-hnes supplies… … * To fiud the exact point of intersection :/ these lines, which are only visuallines, (explained in Art. (19),) three persons are necessary: one stands at soncepoint of one of the lines and sights to some other point on it; a second does thegame on the second line ; by signs they direct, to ri^ht…
Surveying
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