Publisher's Synopsis
Excerpt from The Miami Conservancy Bulletin, Vol. 3: May, 1921
This instrument measures the velocity of a river current by registering the rapidity of revolution of the little wheel at the left. The wheel rotates on a vertical axis, and car ries 6 cone-shaped paddles at its rim. These catch the current and cause the wheel to revolve. The wheel is car ried by a forked rod armed at its rear end with a rudder which keeps the rod pointed upstream, the rod being car ried on another rod which is pushed down into the water from above and held firmly against the bottom. The ver tical rod is jointed to permit use at various depths, the forked rod being slipped up and down on it according to the depth at which the river current is to be measured.
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