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 331
ed for determining the velocity of passing fluids, only thenumber of revolutions of the wheel carrying the vanes is ob-served for a given time. Before the velocity of the fluid in feetper second can be found, the relation between the rate of revo-lution of the wheel and the rate of motion of the… … Fig. 76. a uniform speed, and noting the time occupied and the corre-sponding number of registrations made in passing over a givendistance. It may be attached to the prow of a boat, as shownin Fig. 76, the electric register being in the boat. The dis-tance divided by the time gives the rate of…
Surveying
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