Dynamometers And the Measurement of Power a Treatise On the Construction And Ap
Dynamometers And the Measurement of Power a Treatise On the Construction And Ap
John Joseph Flather
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Fig. 57 illustrates the parts of the " Standard Port- able" dynamometer, and Fig. 58 illustrates it applied to a shaft and pulley. 134 D YNAMOME TERS It is claimed by the manufacturer that these dyna- mometers are only about one-half the weight of other types for equal capacities. The dynamometers have been tested after several years' use and the weighing springs have been found to retain their original strength. No allowance for centrifugal, frictional, or other FIG. 58 VAN WINKLE DYNAMOMETER ...APPLIED TO SHAFT. Error is made in using this instrument. The weighing springs are so proportioned that, as has been proven in tests of the dynamometer, the indications of the scale are unaffected by centrifugal disturbance beyond the highest speeds of shaft in practice. The transmitting mechanism is so proportioned and balanced that any tendency to centrifugal disturbance is avoided. The only sources of frictional disturbance are in the AND THE MEASUREMENT OF POWER. 135 pivotal joints of the rock-shaft motion and the friction due to the weight of the scale.
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