lower end, C, of the shank of jaw, B, is tapered to form a outlet valves are very large, they require but a slight motion to admit or release the air, consequently the machines may screwdriver. When this portion is in use, the single jaw is «m» ——■ be run at a high rate of speed, from 175 to 200… … nature so much lighter than the common air that the instant it escapes the lips and nostrils it ascends to the higher re- gions, above the breathing point, there to be rectified, reno- fit the tube, and also so as to take up wear. It acts both as vated, and sent back again, replete with purity and…
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