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The effect of density on the performance of a water current meter of the cupwheel type, known as the small Price meter, was investigated by calibrating the meter first in water by towing it in a rating tank, and second in air by placing the meter in a wind tunnel. The change from water to air produced a change in density by a fact or of approximately 800. It was found that the revolutions of the cup wheel during 1 foot of travel of the fluid was a fun ction of the product of velocity by the square root of the density and that R eynolds number and turbulence have no measurable effect. It was concluded that changes of density occurring in field use can cause no appreciable error.
Schubauer et al. (Mon,) studied this question.