C D Smith 1940 J. Sci. Instrum. 17 157 doi:10.1088/0950-7671/17/6/304
C D Smith
Show affiliationsThe use of the Maxwell Capacity Bridge for the measurement of rotational speeds has been developed for wind tunnel tests on airscrews. Airscrew performance depends on the wind speed V as well as the rotational speed n, being expressible as a function of the ratio of these two quantities. The deviation of the actual tunnel speed from its nominal value is determined by the prevailing atmospheric temperature and pressure, and its effect on the ratio V/n is arranged to be compensated for by means of additional resistances introduced into one of the ratio arms of the bridge and calibrated directly in degrees centigrade and inches of mercury. At high rotational speeds the charging of the condenser during each cycle may not be complete, but this difficulty is overcome by connecting a large capacity across the leads to the commutator.
Issue 6 ( 1 June 1940)
Received 23 February 1940
C D Smith 1940 J. Sci. Instrum. 17 157
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