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 344
emeter at a uniform rate horizontally. 254. To find the Mean Velocity on the Cross-section.—It is evident that this mean velocity cannot be directly ob-served. In fact, it can only be found by first finding the dis-charge per second and then dividing this by the total area ofthe section. That is to… … Fig. 79- 314 SURVEYING. The area of the section is found by means of properly locatedsoundings. The actual velocities of certain filaments crossingthis section are then observed, and the section subdivided insuch a way that the observed velocities will fairly representthe mean velocities of all the…
Surveying
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