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 184
in certainlimits on either side. It is therefore especially adapted to themeasuring of cross-sections, profiles, or any long and narrowsurface. Fig. 38 shows one form of this instrument as de-signed by Herr Corradi of Zurich. It is a suspended planim-eter, inasmuch as the wheel rolls on a flat disk… … Fig. 38. the two rollers R^. To this frame are fitted the disk A and theaxis of the tracing-arm F. The whole apparatus may thus moveto and fro indefinitely in a straight line on the two rollers whilethe tracing-point traverses the perimeter of the area to bemeasured. The shaft carries a bevel-gear…
Surveying
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