. Modern medicine and bacteriological review. s in placing a U-shapedmanometer in one nostril, keeping theother nostril open and the mouth closedwhile breathing quietly. The change inthe level of the mercurial manometershowed a negative pressure of minus onemillimeter during inspiration, and a posi-tive pressure of two to three millimetersduring expiration. Experiment 2.— The purpose of thisexperiment was to determine to what ex- Experiment j.—The purpose of thisexperiment was todetermine the effect ofdiminishing the exit-area by one opening,adjusting the breathing-tube in such amanner as to c
. Modern medicine and bacteriological review. s in placing a U-shapedmanometer in one nostril, keeping theother nostril open and the mouth closedwhile breathing quietly. The change inthe level of the mercurial manometershowed a negative pressure of minus onemillimeter during inspiration, and a posi-tive pressure of two to three millimetersduring expiration. Experiment 2.— The purpose of thisexperiment was to determine to what ex- Experiment j.—The purpose of thisexperiment was todetermine the effect ofdiminishing the exit-area by one opening,adjusting the breathing-tube in such amanner as to cover one of the four out-lets. Two trials were made, as follows : — (a) Maintaining the pressure at thesame point as before, namely, ten milli-meters, it was found that the time re-quired for expiration was eight seconds. (i>) Managing the expiration so as toempty the lungs in the same time as inExperiment 2 ; namely, five seconds, itwas found that the pressure was raised totwenty millimeters. Experiment 4.— In this experiment the. Fig. 5.— Pneographic Tracing Taken while Using the Breathing-tube, Showing Prolonged Expiration and Reinforcement of Inspiration. tent the expiratory pressure is increasedwhile breathing through the tube with allfour of the exit apertures open. The ex-periment was made with a person whosenormal rate of breathing was found to besixteen per minute. It was, of course,necessary to take into account the timeoccupied in emptying the lungs. Theair was forced through the tube atsuch a rate as to completely empty thelungs in five seconds, the time occupiedin expiration being about three times aslong as usual. Placing the tube, properlyadjusted, in the mouth, the manometerwas also connected with the mouth. Aftertaking an ordinary respiration, the nos-trils were closed, compelling all the air toescape through the breathing-tube. Thepressure indicated upon the manometerwas ten millimeters. number of outlet openings was diminishedto two. Two trials w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmedicine, bookyear189
