A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 206
se, if the workis properly done. This method is quite as accurate as the last, and admitsof very rapid execution. 341. By a Scale of Chords. Witha radius equal to the chord of 60°describe a circle near the middle ofthe paper. Through its centre O (Fig.145) draw a line NS to represent themeridian.… … 204 COMPASS SURVEYING. [Chap. Y. taken from any convenient scale. Through. B draw BCparallel to 0.2: on it lay off BC equal to the second side.Through C draw CD parallel to 0.3; and so proceed till allthe lines have been platted. With an accurate scale of chords of a good size, thismethod is…
Surveying
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