el, by means of cal constants. two fine steel wires. The tunnel itself, standing on (2.) For smooth planes of constant length and vari- the floor of the laboratory, measures 40 feet long by able speed, the tangential resistance may be written: 6 feet square, and has a 5-foot suction fan at one end… … variety of materials, and the coefficients to sixteen, all having identical prow and The Pressure-Tube Anemometer are to each other roughly as the densities stern. of air and water. This fact is of consid- The main object was to determine the erable practical interest. For it is well friction for…
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