. Anaesthetics : their uses and administration. e been made which obviate the turning on the gassupply by rotating the foot-piece, but they are not at allnecessary. A few words may be said about face-pieces. Personally, Iprefer those made of rubber, of the shape designed originally byClover, and furnished with an air cushion (fig. 4). Three sizesare usually required—one for children, also a medium, and alarge. If an expiration valve exists in the stopcock of the 70 ANESTHETICS. mount attached to the Cattlins bag, none is required in theface-piece. Celluloid and metal face-pieces (figs, i and 5
. Anaesthetics : their uses and administration. e been made which obviate the turning on the gassupply by rotating the foot-piece, but they are not at allnecessary. A few words may be said about face-pieces. Personally, Iprefer those made of rubber, of the shape designed originally byClover, and furnished with an air cushion (fig. 4). Three sizesare usually required—one for children, also a medium, and alarge. If an expiration valve exists in the stopcock of the 70 ANESTHETICS. mount attached to the Cattlins bag, none is required in theface-piece. Celluloid and metal face-pieces (figs, i and 5) fittedwith removable air cushions are not satisfactory, as after a littleuse the cushion does not apparently prevent a leakage of gasor air. The advanta,ge claimed for the celluloid mask iscertainly actual—it allows the anaesthetist to see the mouthof the patient, and so enables him to detect vomiting or otheruntoward accident. Colemans stopcock (fig. 5) enables the anaesthetist togive definite quantities of mixtures of gas and air. This. Fig. 4.—Face-piece, stopcock, and gas bag for the administration of nitrousoxide gas only. (Sir F. Hewitts apparatus.) The handle H opens or closes theair way while it closes or opens the supply of 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 a
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