The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 193
Fig. 41. point is the point of intersection of two of the sides of theparallelogram. The upper left-hand member of the frame isnot essential to its construction, serving simply to stiffen the … Fig. 4a. copying-arm, the fourth side of the parallelogram being theside holding the tracing-point. In Fig. 43, neither of the three points is at the intersectionof two of the sides of the parallelogram, and hence there is a ADJUSTMENT, USE, AND CARE OF INSTRUMENTS. 165 fourth point unused, having…
Surveying
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