. Anaesthetics : their uses and administration. by the usual method, includingthe preliminary use of atropine and morphine. Description of apparatus.—The blower D is operatedby a ^ electric motor, controlled by a switch (A).B is the rheostat. The air passes through the tube Eand the oil filter F and the tube G into the bottle bottle H contains hot water, which warms, moistens, andfilters the air. On leaving the bottle H the air passes by arubber tube (I) to the tracheal catheter. To I is connected theether container J. This consists of a glass jar, held air-tight * Annals of Surgery
. Anaesthetics : their uses and administration. by the usual method, includingthe preliminary use of atropine and morphine. Description of apparatus.—The blower D is operatedby a ^ electric motor, controlled by a switch (A).B is the rheostat. The air passes through the tube Eand the oil filter F and the tube G into the bottle bottle H contains hot water, which warms, moistens, andfilters the air. On leaving the bottle H the air passes by arubber tube (I) to the tracheal catheter. To I is connected theether container J. This consists of a glass jar, held air-tight * Annals of Surgery, vol. liii. p. 161. The more recent form of this apparatushas been greatly simplified. ETHER. 191 against its cover by a spring clamp. The cover contains twotubes, X and X\ which are connected with the main air-tubeI. The hand-wheel K controls the air passing through I byan indicator. Thus pure air or pure ether vapour, or anydegree between, can be obtained and is indicated. If pure airis entering, the ether container can be removed and re-. FiG. 44.—Dr. Elsbergs apparatus. plenished, as X and X^ are closed. The manometer L isconnected with I, and records the pressure of air passingthrough I. The tube M, controlled by a stopcock, enters G,and serves to admit oxygen from a tank to which it isconnected. The tube P leads to a foot bellows, for use if themotor breaks down. When the stopcock N is closed and Ois open, the air enters from the foot bellows, traversing the tubeG^. When the apparatus is in use the water bottle has one- 192 ANAESTHETICS. third of water in it, the two stopcocks on the manometer areopened, the stopcock N is opened, O is closed, and therheostat is turned on full. M is left wide open. As soon asthe apparatus is connected with the intra-tracheal catheteralready in situ M is slowly turned until the pressure, asindicated by the manometer, is reduced to 20 mm. Thestrength of ether supplied should be made to vary with thepatients condition and the requirement
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