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 324
by .7854, the product will be the area; consequently,if we divide the area by .7854, and that quotient by the givendiameter, the latter quotient will be the diameter required. EXAMPLES. 1. Lay out an ellipse, which shall contain one acre, with a transverse diameter of 450 links. sq.… … By Prob. 15, Part I., construct the ellipse ABCD; then bya property of the ellipse, (see my Mensuration, page 318,) thesquare of the distance of the focus from the centre, is equal tothe difference of the squares of the semi-diameters: hence, wehave v/2252-141.5i = v/30602.75 = 175 links, equal F…
Surveying
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