Anæsthesia and anæsthetics general and local . th or lint. This is practicallythe method of Simpson, improved. Simpson at first consideredchloroform as a perfectly safe anaesthetic, and recommended it to CHLOROFORM 137 be used powerfully and speedily, in order to avoid he modified his method more in accordance with presentusage. The difficulty of estimating the percentage of chloroform in-haled in this method has been considered its weak point. Snow,who estimated that the inhaled vapor should not exceed a strengthof 5 per cent., calculated that per cent, might be given off
Anæsthesia and anæsthetics general and local . th or lint. This is practicallythe method of Simpson, improved. Simpson at first consideredchloroform as a perfectly safe anaesthetic, and recommended it to CHLOROFORM 137 be used powerfully and speedily, in order to avoid he modified his method more in accordance with presentusage. The difficulty of estimating the percentage of chloroform in-haled in this method has been considered its weak point. Snow,who estimated that the inhaled vapor should not exceed a strengthof 5 per cent., calculated that per cent, might be given offfrom a folded cloth wet with chloroform at 700 F. Lister esti-mated that a moistened cloth held close to the face gave of! per cent. Sansom claimed that at 60 to 640 F. it was possibleto inhale 13 per cent, of vapor with but one dram of chloroformpoured upon lint. That it is practically impossible to estimatethe percentage of vapor inhaled is evident when wTe consider thenature of the fabric used, the number of its folds, the extent of. Fig. 34.—Esmarchs Inhaler. Fig. 34. A simple with frame shaped to fit the contour of the facearound the mouth and nose; one end of the frame is curved to form ahandle by which the apparatus may be held in place. Over this frameworkis stretched a knitted or woven fabric, the texture,of which is of such a na-ture as to admit of the free passage of air. The chloroform may bedropped upon the mask from a small flask containing a cork through whicha suitable drop tube is passed. This tube reaches nearly to the bottom ofthe bottle and is curved so that all of the chloroform in the container maybe dropped from the tube. The mouth of this drop tube is closed by asuitable cap that the chloroform vapor may not escape from the flask whennot in use. Air to replace the chloroform is admitted by a second tubealso passing through the cork. I38 CHLOROFORM surface wet with chloroform exposed to the air, the proximity ofthe fabric to the patients mouth
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