. Anaesthetics : their uses and administration. Fig. I.—Yoked nitrous oxide cylinders with Cattlins bag, face-piece, and metal valved connexion supported on stand. of containing two and a half or two gallons of gas. The face-piece, which should fit accurately, is connected with the gasbag by a metal mount containing both inspiratory and ex-piratory valves to prevent the patients exhalations fouling 68 ANESTHETICS. the bag. Mr. Vernon Knowles has devised a reversiblebag (fig. 2) which can be turned inside out after washing andsteriHsing, so that each patient breathes into a sterile tub
. Anaesthetics : their uses and administration. Fig. I.—Yoked nitrous oxide cylinders with Cattlins bag, face-piece, and metal valved connexion supported on stand. of containing two and a half or two gallons of gas. The face-piece, which should fit accurately, is connected with the gasbag by a metal mount containing both inspiratory and ex-piratory valves to prevent the patients exhalations fouling 68 ANESTHETICS. the bag. Mr. Vernon Knowles has devised a reversiblebag (fig. 2) which can be turned inside out after washing andsteriHsing, so that each patient breathes into a sterile tuberculous, syphilitic, or other obviously septic personsare concerned, it is wise to employ an all-metal face-piece. Fig, 2.—Mr. Vernon Knowles reversible bag. instead of the usual rubber one, since the latter cannot beboiled without destroying it (see fig. 3). The two stopcocks figured below are simple and allow easyaccess to the valves, which is essential, since all rubbermaterial is apt to perish unless constantly in use, and unless NITROUS OXIDE GAS. 69 kept at a moderately warm temperature (figs. 4 and 5).It is useful to powder the bag, the face-pieces, and so onwith French chalk and boric powder after cleansing, as thisobviates the rubber sticking together and maintains a smoothsurface. When the gas supply is taken from a large gas containerthis is connected with the bag and face-piece by an adequatelength of tubing. After use the cylinders should be carefully examined toascertain whether the exit is fully closed. Any escape maybe detected if a film of water be smeared over the free end,since, if there is any escape of gas, a bubble will form.
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