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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 41

An illustration from Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice, 1922, leaf 41 — o time. The mercurycolumn is a cumbersome and expensiveapparatus for pressures above a few pounds,although it is the most accurate method ofmeasuring the true pressure. Besides, ahigh degree of accuracy is not needed sincethe least count of commercial gages isgenerally not less than 5 lbs. It is… … Fia. 12.—Vacuum Gage Tester. SCALES AND PRESSURE GAGES 25 method is convenient but the friction of the plunger preventstrue records. Fig. 13 shows an apparatus of this type. ,, Weights -forf Measuring Pressure b

Mechanical engineering

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