. Anaesthetics : their uses and administration. Fig. 45.—Mr. R. E. Kellys intra-tracheal Fig. 46.—Motor actuating Mr. Kellys insufflator. water, thence it travels to an ether chamber constructed uponthe surface carburetter principle. The pointer is thecontrol and by turning it to full all the air passes over the ETHER. 195 ether, or turning it to O no ether mixes with the strengths of ether are obtained by intermediatepositions of the pointer. The air and ether vapour then passthrough a coil of lead tubing which is kept at the requiredtemperature by an electric h
. Anaesthetics : their uses and administration. Fig. 45.—Mr. R. E. Kellys intra-tracheal Fig. 46.—Motor actuating Mr. Kellys insufflator. water, thence it travels to an ether chamber constructed uponthe surface carburetter principle. The pointer is thecontrol and by turning it to full all the air passes over the ETHER. 195 ether, or turning it to O no ether mixes with the strengths of ether are obtained by intermediatepositions of the pointer. The air and ether vapour then passthrough a coil of lead tubing which is kept at the requiredtemperature by an electric hot plate controlled by a manometer and thermometer are placed in the circuitbetween the heater and the tube which connects with theintubating catheter. A much simpler apparatus has been devised by Dr. Ehren-fried,* and consists of a Wolffs bottle with three necks,sitting within a copper water jacket, and a foot bellows. Bymeans of stopcocks on the outside of the jacket the streamof air from the bellows can be carried through the hot waterover the surface of the ether (contained in the W
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