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 58
pendi-cular by the base, as in the first paragraph of Art. (65). (79) Let the given figui-e have five sides, as in Fig. 42. Forbrevity, the anglesof the figure wiU benamed as numberedin the engraving.Produce 5—1.Join 1 — 3. From2 draw a parallel to 1 — 3, cutting the Z~ T T produced base in 1. Join… … (80) Let the given figure be 1 — 2 — 3—4—5 — 6 — 7 — 8,as shown in Fig. 43, given at the top of the following page. Allthe operations are shown by dotted lines, and the finally resultingtriangle 6—7 — 8, is equivalent to the original figure of eightsides. It is best, in choosing the side to be…
Surveying
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