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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 195

An illustration from 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, leaf 195 — gram,but it is not necessarily so taken. These three points are : thefixed point, the tracing-point, and the copying-point. In Fig. 41, i^is the fixed point, held by the weight P\ B isthe tracing-point, and D is the copying-point, or vice versa asto B and D. The parallelogram is E, G, B, H. The… … FlG. 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

Surveying

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