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 193
chain be keptfast at a, and the eightieth link atm; take hold of the fiftieth link,and stretch the chain so that thetwo parts a n. and m n, may beequally tight: then will m n beperpendicular toam, For m n will be 30, a m 40,and a n 50 links; or the sides ofthe right-angled triangle a m nwill be in… … *A Find by the above processthe perpendicular c d j and proceed in that direction till you arebeyond the building, as at h. Again erect the perpendicularh e, upon which measure till you have made h p, equal tome; Part IV.) LAND SURVEYING. 171 and you will then be in a direct line with m A. Erect…
Surveying
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