an instrument for measuring power , in which the energy of a revolving wheel or shaft is absorbed by the friction of a brake. The typical form of absorption dynamometer is the prony brake , which consists of a lever of definite length in frictional contact with a wheel or shaft and having adjustable screws by means of which the intensity of the friction may be varied . The end of the lever is attached to scales and the friction measured , from which the brake horsepower can be calculated. A brake dynamometer.
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