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 75
slackening results. Upon the return stroke theforce of acceleration varies in the same way as on the advance. The force of friction is always opposite to the drum motionand therefore changes its direction at each stroke. During theforward stroke it tends to increase the cord stress, and uponthe… … —Forward Stroke -—>k Return Stroke -»J g Fig. 37.—Variation of Forces on Indicator Card. is practically negligible; hence the resultant cord stress increaseson the forward stroke, and decreases on the return with loweredvalues due to the reversal of friction. At high speeds, the forceof…
Mechanical engineering
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