. Anaesthetics : their uses and administration. gas from the bag. The tap markedT when rotated closes the expiratory valve and allows of rebreathing. The arrowsindicate the course followed by air or gas. is effected by the see-saw aluminium plate valve whichis in conjunction with the seats of the air and gas the movement of the handle H, the aluminium platevalve opens and closes both inlets to the mixing chamberand thus admits air or gas singly or mixed in various pro-portions according to the position in which the handle is operate the stopcock when administering nitrou
. Anaesthetics : their uses and administration. gas from the bag. The tap markedT when rotated closes the expiratory valve and allows of rebreathing. The arrowsindicate the course followed by air or gas. is effected by the see-saw aluminium plate valve whichis in conjunction with the seats of the air and gas the movement of the handle H, the aluminium platevalve opens and closes both inlets to the mixing chamberand thus admits air or gas singly or mixed in various pro-portions according to the position in which the handle is operate the stopcock when administering nitrous oxide,fix the handle H at position i for air, and turn it upward toposition H for gas. For mixtures of gas and air graduallyturn the handle H down towards i, which will admit thedesired amount of air. NITROUS OXIDE GAS. 71 Subsidiary Requirements. Gags, mouth openers, dental props, tongue forceps, oralspoon, a tracheotomy case, sponge holders, tincture ofiodine, and sterilised mops should always be at hand beforethe administration Fig. 5.—Three-way stopcock. (Mr. F. Colemans principle.) F P Face-piece. E V Expiratory valve (rubber). I V Inspiratory valve (aluminium). A A Air aperture. G I Gas inlet tube to which the Cattlins bag is attached. H Handle set for nitrous oxide. 1 Handle set for air. 2 Handle set for rebreathing into bag-. Gags.—The one figured has special advantages from thefacility it offers for rapid removal and replacement. In itthe screw-fixing arrangement is replaced by a ratchet. By putting the finger upon the free end of the ratchetand pressing it backwards as one does a trigger, theratchet is released and the gag closes. To open it, it isonly necessary to press the handles together and the 72 ANAESTHETICS. ratchet will automatically gear and prevent closing ofthe mouth. The ratchet arrangement can be used withlong or short handles; personally I prefer , the long handles such powerful leverage is obtainedthat teeth may be easily
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