. Anaesthetics : their uses and administration. ee (), to which he was co-opteda member. The regulator supplied the essentials for adosimetric inhaler capable of giving definite percentages ofchloroform and yet being wholly under the control of theanaesthetist. After prolonged investigation it was acceptedas satisfactory by the Committee. Description of the Apparatus. The Harcourt inhaler supplies, in sufficient quantity forfull respiration, a mixture of air and chloroform vapourwhich is automatically limited to a maximum strength of2 per cent., and can be diluted at will with additional


. Anaesthetics : their uses and administration. ee (), to which he was co-opteda member. The regulator supplied the essentials for adosimetric inhaler capable of giving definite percentages ofchloroform and yet being wholly under the control of theanaesthetist. After prolonged investigation it was acceptedas satisfactory by the Committee. Description of the Apparatus. The Harcourt inhaler supplies, in sufficient quantity forfull respiration, a mixture of air and chloroform vapourwhich is automatically limited to a maximum strength of2 per cent., and can be diluted at will with additional airdown to any lower percentage. Into the two-necked bottle chloroform is poured to near * See British Medical Journal, July 18, 1903 ; also British GyncscologicalJournal,May 1904, Chloroform in Surgical Anesthesia, the Vernon Harcourt Inhaler,for papers by the present writer dealing at length with the practical and clinicalaspects of this invention. The apparatus is made by Messrs. Griffin & Co., ofKingsway, London. 244 ANESTHETICS. w^ ^. the top of the conical part as shown in figure 54, and twocoloured glass beads are dropped into the liquid to indicatewhen the temperature is within the range i6°-i8 C. If the■ temperature of the chloroform is below16° both the coloured beads will float ;if it; is above 18° both will sink; in theformer case the proportion of chloroforminhaled will be less than the pointer ofthe stopcock indicates ; in the lattercase it will be greater. The proportionis also increased by any agitation of thebottle. During inhalation the chloro-form is cooled by evaporation ; itstemperature can, however,be kept between 16° and18° by now and then hold-ing the bottle in the handtill the blue bead has sunkand the red bead is be-ginning to sink. Whenthe inhaler is mountedupon a stand the tempera-ture of the chloroform canbe kept at the required height by amovable stand supporting either a hot-water bath or a spirit lamp separatedfrom the bottle by a wire ga


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