. Anaesthetics : their uses and administration. Fig. 21.—Sir F. Hewitts apparatus for giving nitrous oxide gas with oxygen. position and whether the rubber of which they are composedhas perished and needs renewal. If this is not done the gasesmay pass back into the bags and become mixed, and even if avalve sticks, the supply may be cut off and failure may ensue, NITROUS OXIDE GAS WITH OXYGEN. 109 causing distress to the patient and chagrin to the supplementary stopcock can be fitted which enables theadministrator to increase the supply of oxygen to meet anyemergency. The most ca
. Anaesthetics : their uses and administration. Fig. 21.—Sir F. Hewitts apparatus for giving nitrous oxide gas with oxygen. position and whether the rubber of which they are composedhas perished and needs renewal. If this is not done the gasesmay pass back into the bags and become mixed, and even if avalve sticks, the supply may be cut off and failure may ensue, NITROUS OXIDE GAS WITH OXYGEN. 109 causing distress to the patient and chagrin to the supplementary stopcock can be fitted which enables theadministrator to increase the supply of oxygen to meet anyemergency. The most careful attention to carrying out its details isessential for this method. The utmost accuracy in fitting the Airhole closedby remlumg drum. Fig. 22.—Shows tube tonitrous oxide bag. Its openinginto mixing chamber. Oxygentube connected with oxygenbag and opening into Uitleoxygen chamber. There areten minute holes between thisand the mixing chamber ; threeof these only are shown infigure as open. There are re-movable valves fitted, whichact during inspiration and pre-vent diffusion of the gases intothe bags. /. V. Main inspiratoryvalve. E. V. The expiratoryvalve, its chimney, which pre-vents air being drawn backthrough E. V. A handle rotatesthe drum and opens oxygenholes. As the drum rotates,the air, nitrous oxide, andoxygen inlets are respectivelyopened and closed. The drumis not shown in the figure. , mask, and excluding the entrance of air beneath the aircushion are essential. It is well also to make oneself quitesure that the terminals, , the N2O and O2, are attached tothe appropriate bags. The metal collars should have theabove letters impressed or scratched upon them to avoidpossible mistakes. no ANAESTHETICS. Th
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