Twisden, John Francis · London, Longmans, Green, and Co. · leaf 255
odaced by working the instrument. It issaid that with the best instruments the vacuumpressure can be reduced as low as 002 in. of mer-cury. There are other means by which the vacuum ^^^i5^^j?>s^ r--;?pressure can be reduced to as little as OOOOOS in. of ^^^ ~~^^~^^—if mercury. 165. The hi/drauUc… … FlG.103. ^C
Mechanics, Analytic
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