Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
157. Figure 4.—Finding the velocity of rivers.—This isdone by stationary revolving wheels, and floating bodies, and also bymeans of a tunnel-shaped tube, open at both ends and bent at rightangles, as shown in the figure. The current, W, and its direction, areindicated by the horizontal lines. The…
Physics · Astronomy
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