The art of anaesthesia . .c. per minute. Two reducing valves, one for nitrous oxide, and onefor oxygen, are provided (Fig. 105). Each reducing valve is mounted on a double cylinders of each gas, clamped into their yokes, seton the floor, not requiring any other support. The reduc-ing valves provide a supply of nitrous oxide and of oxygen NITROUS OXIDE OXYGEN ETHER ANAESTHESIA 231 at a constant pressure of 10 pounds to the square reducing valves are connected with the controllingvalves by rubber tubing. A frame, which supports the controlling valves andindicators, is provided
The art of anaesthesia . .c. per minute. Two reducing valves, one for nitrous oxide, and onefor oxygen, are provided (Fig. 105). Each reducing valve is mounted on a double cylinders of each gas, clamped into their yokes, seton the floor, not requiring any other support. The reduc-ing valves provide a supply of nitrous oxide and of oxygen NITROUS OXIDE OXYGEN ETHER ANAESTHESIA 231 at a constant pressure of 10 pounds to the square reducing valves are connected with the controllingvalves by rubber tubing. A frame, which supports the controlling valves andindicators, is provided with a clamp which serves to attachthis part of the apparatus to a table or chair, doing awaywith the need for a stand (Fig. 104). On the frame aremounted three needle valves, two wash bottles, and a vapor-izer of special construction. Oxygen passes through thevalve and wash bottle on the left, and nitrous oxidethrough the valve and bottle on the right. The washbottles serve as indicators of the flow of nitrous oxide and. Flo. 106.—Face-piece. Miller apparatus (Courtesy Dr. Miller.) oxygen and also moisten the gases. Dials attached to thestems of the needle valves are calibered in litres per min-ute of flow of nitrous oxide and of oxygen. The middlevalve transmits a stream of nitrous oxide to a vaporizerwhich provides a constant percentage of ether vapor, variedby changing the rate of flow of the gas. One litre ofgas vaporizes in this way five of ether per unit of the apparatus is connected with the inhaler byrubber tubing. The mixture of gases takes place close tothe face piece. The inhaler has a face piece of celluloid, with an in-flatable rubber cushion or a cuff (Fig. 106). The air 232 ANESTHESIA valve on the inhaler is open when the gas is shut off, andvice versa. Consequently the face piece may be adjustedto the face, so that the patient becomes accustomed tobreathing through it before the anaesthetic is introduced.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanesthe, bookyear1919
