The Medical and surgical reporter . er over intothe bath, and then the straight tube is pusheddown into the water until its lower end is at thelevel at which it is desired to keep the water inthe bath ; this end must be slightly above thatof the syphon tube, the vertical differencebetween the level of these ends forming theeffective syphon power. When, now, the levelof water in the bath falls below the end of thestraight tube, from evaporation, the syphonacts, and the water flows over from the flaskinto the bath, until the water in the latterattains its former level. The most important part of
The Medical and surgical reporter . er over intothe bath, and then the straight tube is pusheddown into the water until its lower end is at thelevel at which it is desired to keep the water inthe bath ; this end must be slightly above thatof the syphon tube, the vertical differencebetween the level of these ends forming theeffective syphon power. When, now, the levelof water in the bath falls below the end of thestraight tube, from evaporation, the syphonacts, and the water flows over from the flaskinto the bath, until the water in the latterattains its former level. The most important part of the whole ar-rangement, however, is the gas regulator, modi-fied from Bunsen (Fig. 4), which keeps the bathat a constant temperature. It consists of awide glass tube, about six inches long, with anarrow horizontal arm coming off at its upper part, and divided at about the centre by a hori-zontal partition or septum, from which a tuberuns down nearly to the bottom of the largetube. The large tube is fitted with a perforated Fig. BUNSENS GAS REGULATOR. a. Tube connected with gas main, b, with the gasburner. When the bath has been heated t o thedesired temperature, the tube b is pushed downuntil its lower surface touches the upper surfaceof the mercury, e, thus shutting off all the gasexcept what can pass through the minute open-ing d. The bath then cools, and the expandedmercury and hot air compressed in e shrink andmore gas passes until the bath is again heatedup, when the expanding mercury again shutsoff the gas. cork, through which passes a small tube open atboth ends, and having, at about an inch fromthe lower end, a minute opening in one wanted for use, a quantity of clean, drymercury is poured into the large tube (part ofwhich runs down the inner tube from the sep-tum, and compresses the air in the lower cham-ber), until there is about an inch of mercuryover the septum. The cork is then put in, andthe horizontal arm connected with the gasmain, and the straigh
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Keywords: ., bookcentury1800, bookdec, booksubjectmedicine, booksubjectsurgery
