Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 57
^ G^ is to be measured; the trial Ime AF \^ run out and theranging-rods B, C, &c., fixed at known distances apart and asnearly in the line as possible ; the perpendicular 6^i^is measured ;then from the similar triangles, AFG and ABH, AF: AB :: FG : BH, The distance BH thus becomes known, and… … Fig. 33. manner put in their true positions at /, K, &c., and the true lineis marked out. 75. To trace on the ground the direction of a straight line,that shall be perpendicular, at a given point, to a givenstraight line. FIRST METHOD. Any three lines having the ratio 3, 4, and 5, form a…
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