Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
or disk through whichthere is an aperture, the diskbeing provided with a suitablehandle and an outward workingvalve, as shown. Operation.—If the handle bedrawn up, a vacuum will be formedAvithin the bellows, which will betilled from the supply-pipe below,as indicated by the arrow. Byreversing the… … Fig. 24.
Physics · Astronomy
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