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 45
it needs calibrating itself from time to time. The mercury column 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… … Fig. 12.—VacuumGage Tester. inch. (See Fig. 12.) The standard weight SCALES AND PRESSURE GAGES 25 method is convenient but the friction of the plunger preventstrue records. Fig. 13 shows an apparatus of this type. Weicjfrh forJ Measurinq Pressure
Mechanical engineering laboratories
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