. Anaesthetics : their uses and administration. method, it is convenient to deal with it in this place. Dr. Teter who has identified himself with this form ofanaesthesia, has enjoyed a wider experience than any oneelse, having recorded many thousands of cases if we includeminor with major operations. Dr. Gwathmey * has shownconclusively that when the gases or vapours of anaestheticsare adequately warmed at the time they enter the lungs, theirnarcotic effects are enhanced, while their liability to producedeleterious after effects is lessened. Dr. Teters latest apparatusis simple and easily work
. Anaesthetics : their uses and administration. method, it is convenient to deal with it in this place. Dr. Teter who has identified himself with this form ofanaesthesia, has enjoyed a wider experience than any oneelse, having recorded many thousands of cases if we includeminor with major operations. Dr. Gwathmey * has shownconclusively that when the gases or vapours of anaestheticsare adequately warmed at the time they enter the lungs, theirnarcotic effects are enhanced, while their liability to producedeleterious after effects is lessened. Dr. Teters latest apparatusis simple and easily worked when once it is understood. Itpermits of adequate warming of the gases. The apparatus.—This consists of a stand supporting fourcylinders, two of nitrous oxide and two of oxygen, so thatwhen one cylinder is exhausted a second may be turned onwhile the empty one is removed and replaced by a full order that the best results, may be obtained it is essential * New York State Jotir. of Med., Feb. 1908. NITROUS OXIDE IN MAJOR SURGERY. II5. Fig. 23.—The Teter nitrous oxide and oxygen apparatus for major surgery,with ether attachment. Il6 ANESTHETICS. that the gases be reduced from a high to a low is accomplished by pressure regulators, which areincorporated in the head of the apparatus. It is possible bythis means to obtain definite proportion of nitrous oxide andoxygen, which will continue to flow in the same proportionuntil a change is made by the anaesthetist. To obviate thepossibility of the nitrous oxide frosting, steam is forcedthrough the nitrous oxide pressure regulator by means of amechanism which is part of the vapour warmer. After the regulators are adjusted to the desired pressuretlie anaesthetic is controlled by the controlling valves whichare directly over the regulators. The dials are marked toshow the number of gallons per hour that are being cylinders are attached to these regulators and theregulators connected to the mixing chamber
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