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 194
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 the same properties as the fixed,tracing, and copying points, it being at the intersection of… … Fig. 43. combinations which will do the work of a pantograph. Theonly essential conditions are that the fixed, the tracing, and thecopying points shall lie in a straight line on at least three sidesof a jointed parallelogram, either point serving any one of thethree purposes. i-5?>* Use of the…
Surveying
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