A complete treatise on practical land-surveying, in seven parts; . re given, the area may be foundas follows. From half the sum of the three sides subtract each side seve-rally ; multiply the half sum and the three remainders continually together,and the square root of the last product will be the area required. Thismethod is too prolix, except in particular cases ; the operation may, how-ever, be considerably simplified, by performing the multiplication and evo-lution by Logarithms. PROBLEM I. TRIANGULAR FIELDS. When you have a triangular field to survey, begin at themost convenient corner, a
A complete treatise on practical land-surveying, in seven parts; . re given, the area may be foundas follows. From half the sum of the three sides subtract each side seve-rally ; multiply the half sum and the three remainders continually together,and the square root of the last product will be the area required. Thismethod is too prolix, except in particular cases ; the operation may, how-ever, be considerably simplified, by performing the multiplication and evo-lution by Logarithms. PROBLEM I. TRIANGULAR FIELDS. When you have a triangular field to survey, begin at themost convenient corner, and measure each side; and, whilemeasuring any one of the sides, leave a mark in some situationon the chain-line, that the distance between it and the oppositeangle being measured, may be a proof line. Or, leave marks upon any two of the chain-lines, and thedistance between them will prove your work. EXAMPLES. 1. It is required to construct a figure, and find its area, fromthe following notes. 112 LAXD-SLRVEY1XG, (Part IK. DC 913 proof-line. Return to D. Begin at. D, station for a proof-line.
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