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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 230

An illustration from Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice, 1922, leaf 230 — er, for convenience, instead ofat the side. It should be noted that the laps may be measured when theeccentric is vertical, as this position of the eccentric puts thevalve practically in its mid-position. (a) Measurement of Lead. This is made by measuring theamount of port opening, the valve chest… … \ WW////, % Fig. 86. because, at the end of the stroke, there is no appreciable move-ment of the cross-head when the crank moves through severaldegrees. The eccentric, however, is then in a position where afew degrees of error will cause a considerable error in the positionof the valve.…

Mechanical engineering

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