. Anaesthetics : their uses and administration. vv^ith lateraltubes of stout rubber (FT) which pass to the back of thepatients head and are held together by a sliding clamp (SC)which keeps the nose-piece in accurate apposition with theface without undue pressure. These tubes then pass down tothe stopcock valve, completing the clear way from the gassupply to the patient. In some apparatus the mouth iscovered by a metal mouth cap (Ml) provided with anexpiratory valve (Ev) and the patient is instructed to in-spire through his nose and expire through his mouth. has improved this by carr
. Anaesthetics : their uses and administration. vv^ith lateraltubes of stout rubber (FT) which pass to the back of thepatients head and are held together by a sliding clamp (SC)which keeps the nose-piece in accurate apposition with theface without undue pressure. These tubes then pass down tothe stopcock valve, completing the clear way from the gassupply to the patient. In some apparatus the mouth iscovered by a metal mouth cap (Ml) provided with anexpiratory valve (Ev) and the patient is instructed to in-spire through his nose and expire through his mouth. has improved this by carrying a second gas tube(rt) from the stopcock to the mouth cap so that by depressingthe metal handle (NgOL) the gas enters both by way of themouth and nose. When this is used it is immaterial whether thepatient breathes by his mouth or by his nose. If the handle * Subsequently described in 1898 before the Society of Anaesthetists ; seeTransactions^ vol. i., p. Op. cit., vol. i., p. 170. See also Dent-al Record, April i, 1898, p. 147. ST-C. VSf Fig. 18.—Mr. F. Colemans combined mouth and nose nitrous oxide inhaler. Combined mouth cover and inhaler—MI—Mouth cover. I EV—Expiratory valve. N2OL—Nitrous oxide lever. | RT^Rubber tubing. EV—^Expiratory valve. B—t$ody. S—Shutter. Cr—Conveying tubes. NC—Nose cap. FT—Flexible tubes. Nose-piece, etc.— SC—Sliding clamp. ST-C—stopcock. G—Gas bag distended. C—Gas bag compressor distended. H—Tubing to gas stand. 93 94 ANAESTHETICS. is allowed to escape, a spring causes it to rise and to close thegas supply to the mouth cover so that in that case the mouthcap acts merely as a means of expiration. The weight of theapparatus is supported by a chain and hook which can beattached to the operating-chair. When anaesthesia has beenobtained the mouth cap and tube are dropped and the gassupply maintained through the nose. It is essential that thepatient should have a fairly patent nasal passage and this factshould
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