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 81
Example 10. Calculation. sq. Iks. g From 200 on 480 110 F.S. toB H g Frojn 280 on 480 175 F.S. to J) From A 480 280 200 O to C ADC= ^ X 480 X 175 = 42000sq. chains 6.8400Acres 0.684It is still easier to take the twotriangles together; multiplyingthe diagonal by the sum of the per-pendiculars and… … From 5.07 on 7.37 1.54 F. S. to i^ From 1 60 on 1.1b 2.53F. S. to D From 5.45 o« 11.42 4.93F 8. to K From 4.95 on 11.42 F. S. to 13 From E 7.37 5.07 0 to A r H From C 7.75 1.60 0 toE r From A 11.42 5.45 4.95 0 to c Example 11. Calculation.The content of the triangles maybe expressed thus: sq.…
Surveying
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