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 41
as follows: Haying found thefoci F, f, as before, take a thread equal in length to the transverse diameterA B, and fasten its ends, with two pins, in the points F, f; then stretch thethread to its greatest extent ; and by moving a pencil round, within thethread, keeping it always tight you will… … B E Draw the diagonal D B, and parallel to it draw C E, meetingA B produced in E. Join the points DE; so shall the triangleA D E be equal to the trapezium A B C D. Note.—This and the following Problem may be applied in finding theareas of trapeziums and irregular polygons by first reducingthemto…
Surveying
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