A complete treatise on practical land-surveying, in seven parts; (1839)
Nesbit, A[nthony], 1778-1859. [from old catalog] · London, Longman, Orme, Browne, Green, and Longmans; [etc., etc.] · leaf 73
he two perpendiculars, and the place of eachperpendicular given, you may construct any trapezium in the same manner. TO COMPUTE THE CONTENT. Rule.—Multiply the base and perpendicular together, dividethe product by 2, and the quotient will be the area. Or, multiply half the base by the whole… … Measure from A toward C, and when you come to m, forinstance, at 935 links : try with your cross; and if this be thepoint for the perpendicular, measure m B = 62.5 links. Returnand measure m C = 628 links, making the whole base = 1563links; then construct the figure, and find its area. 1563…
Surveying
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