. Scientific American Volume 51 Number 15 (October 1884) . ociated underthe direclion ofordinary physic-ists who havebeen unable tochange the ratioexisting betweena volume of wa-ter and the re-sulting volumeof gases, lie hasbeen enabled tofill large spaceswith vapor undergreat pressure,simply becauseunder his manip-u 1 a t io n ouratoms becomehi s i t may be stated that he claims to have obtained a vacuumof thirty-one pounds. The gun has a spherical knob,secured to the breech, from which projected a roundbar having a diameter about equal to that at the extremityof the mu
. Scientific American Volume 51 Number 15 (October 1884) . ociated underthe direclion ofordinary physic-ists who havebeen unable tochange the ratioexisting betweena volume of wa-ter and the re-sulting volumeof gases, lie hasbeen enabled tofill large spaceswith vapor undergreat pressure,simply becauseunder his manip-u 1 a t io n ouratoms becomehi s i t may be stated that he claims to have obtained a vacuumof thirty-one pounds. The gun has a spherical knob,secured to the breech, from which projected a roundbar having a diameter about equal to that at the extremityof the muzzle. The breech was 4J^ inches in diameter, and the length 3)^ feet. Just forward of the trunnions, at thepoint F, the muzzle unscrewed; this construction was neces-sary to permit the placing of the gas check in position. Thesectional view of the gun is not drawn to scale, and wasnot extended to the end of the breech, as the inventor didnot wish to make public all the details; we give the drawingmerely to show how the gas check was secured and its loca-. KEELY SECTION. tion. A sleeve, c, having a bore equal to that of the gunfitted in an annular recess in the forward part of the breech,F. As the muzzle was screwed upon, the sleeve was forcedin until it Srmly held the gas check placed between the rearend of the sleeve and a shoulder formed in the breech. The gas check consisted of three disks having a diameterof 1^^ inch; the two front disks were of common hard rub-ber having a thickness of sV of ^ inch; the third disk— KEELY SIZE VIEW OF GAS CHECK DISKS AND placed next to the pressure—was of soft rubber packing, sin-gle ply and ^ of an inch thick. The exact size of thesedisks is shown in Figs. 1, 3, 3, and 4, Fig. 1 being the diskbefore rupture. Figs. 2 and 3 showing the hard rubber disksafter the discharge, and Fig. 4 showing the soft rubber oneafter the discharge. The broken disks also show the im-print made by the end of the sleeve. A spheric
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