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 241
3.—All the operations must be performed with the utmost care and accu-racy ; and if, at any time, the ruler be suffered to slip, the work must berepeated, or it will not be correct. 4.—When an error has been committed, it may frequently be discoveredby the eye, after the equalising line is drawn.… … Produce the perpendicular B C, for a temporary line. Lay your ruler from C to E; bring it down in a parallel Part V.) LAND-SURVEYING. 213 position to D; and make a mark upon the line B C, wherethe edge of the ruler intersects that line, as at m. Lay jour ruler from m to A ; move it in a parallel…
Surveying
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