Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 52
l asa single force,/, then the horse-power developed is 27rr/iV^33,000;r being the radius of the wheel in feet. Now since the forceW exerted by the scales, S, produces equilibrium, by the prin-ciple of moments RW = rf, DYNAMOMETERS 35 and therefore by substituting in the expression for… … Fig. 20.—Prony Brake. It should be noted that the arm, A, by its weight producesa force acting on the scales which should not be included in theforce balancing the frictional effort. This should be allowedfor by determining the unbalanced weight of the brake, or brake zero, and subtracting it from…
Mechanical engineering
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