Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 56
,a trial line may be run out by ranging-rods placed at convenientdistances in line with each other and with the staff at thebeginning of the line, and as nearly as possible in the requiredline. Then draw on the ground a perpendicular (by a methodto be shown presently) from the staff at the end of… … ^ 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…
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