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Show ! WHY iioES-GTJ POWDER DRIVE , ut$ guppqwdcf is buniedi.,'tho; "cl'e-" mejUs.or.whiuli It til cbiiipocd.are..clmng-! ed ironv the solid to hc gaseous. form; and, as gases, they occupy some 3d0 or -100 times more bulk tluuUljcy.do In tlmaolld state ut the? same 'temperature,. But' tlie 'substanccd, at the sainu time that, they are ehiingcd into gases, are intensely heated, heat-ed, and by this ineans Uieir volume or pressure" is Still wore'ttiigmeiitetL Various I statements lid ve' been made in relation' to : the- atuoimS of presniru produced by thei lutniing of gunpowder, but tho best experiments ex-periments that we Uiveseou. any account-of; account-of; Avere iuatlo by sonic of tho oftlcerit of otje nriny. Little eytlifdcrs furntheii wltlrwlid pistons, nnd t'onisiiilng oil, were inserted lu the' niCf iil of the" gun, opening at right hrigles Into ttiff bore, so that the 'pri-irotbg'aW't'iju-rftfi)r to; piston; cdtn)'rssiiig..th'q Oil An5' iirraifg.-uitpt iirraifg.-uitpt was iiUulu by ' Which the -jiistbh j marked the distdnee to which it wusjorcerl into tho cylinder, tlnw registering tjiecoin pression..-' The force: required to comprds the oil to theSame-Vxtl'iit waS.iit'terw.ards ascertained by meunrf of a lcvtr and weight, Tim pruNfuro- iu tUo iq;veral parts of.the lwre.was tms miAsurtd, ad was fotiudli) bd nbaut 2&,00Q .ibsl do.tfifi Hqtiuro -inch ncur the breech and to diDiin-ish diDiin-ish rapidly, tows rtls. the muzzle. iiikn-. lifit AmuhiH..; , ' . |