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The essential part of the gas apparatus is a stop-cock con taining two valves. The inspiratory valve is set in an inner cylindrical tube, which works by a handle through a right-angled slit in an external cylinder supporting the expiratory valve superiorly, and inferiorly gives attachment to the gas bag. The valves themselves are made of thin sheet hard rubber, and are therefore non-shrinkable and stand all climates. When the handle is turned down to point indicated by "air," Fig. 1, the gas bag is closed by means of the obturating function of the inner tube; when the handle is turned upward, to place indicated by "gas," Fig. 2, air is excluded and gas is inhaled by means of the inspiratory valve. Expirations of thepatient pass out through the expiratory valve; at the same time the inspiratory valve is closed. During inspiration the inspiratory valve is opened at the same
GOLDAN SO. Apparatus, With Non-Perishable Valves, for Administration of Nitrous Oxid and Ether, Separately or in Combination, Without Change of Inhalers. JAMA. 1900;XXXV(24):1578–1580. doi:https://doi.org/10.1001/jama.1900.24620500044022
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