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Mechanical laboratory methods; a testing of instruments and machines in the mechanical engineering laboratory and in practice (1918)

Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 54

An illustration from Mechanical laboratory methods; a testing of instruments and machines in the mechanical engineering laboratory and in practice, 1918, leaf 54 — ds of work done in one minute. If an enginecan deliver 33,000 foot-pounds ofwork in one minute it is rated as1 horse-power; if 66,000, 2 horse-power; and so on. Generally engines deliver a rota-tive effort. Suppose, for example,that an engine transmits an average Fig. 19. tangential force of F… … 34 dyna]mo:meters 6 The foot-pounds of work per revolution are then 2-rXFy and ifthere are N revolutions per minute, the work done per minutewill be 27rrFxX, and the horse-power will be 2xrFAr 33,000* The quantity rF is called the torque/ Dynamometers are used for measuring power. Generallj^…

Mechanical engineering laboratories

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