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 169
instrument to be attached tothe wheel of a vehicle to record the number of revolutionsmade by it. One form of such an instrument is shown inFig. 32 attached to the spokes of a wheel. Each revolution is recorded by means of the revolution ofan axis with reference to the instrument, this axis really… … Fig. 32. it does this is properly recorded and indicated by appropriategearing and dials. This method of measuring distances is more accurate thanby pacing, as the length of the circumference of the wheel is aconstant. This length multiplied by the number of revolu-tions is the distance travelled.…
Surveying
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