. Modern medicine and bacteriological review. the mouth and nose. Thischamber is provided with a second open-ing, the size of which is controlled by ashutter, which can be adjusted at use, the patient under examinationbreathes into this chamber, which maybe called the breathing chamber of theinstrument. With the chamber com-pletely closed, the breath would simplypass from the mouth into the chamberand back again, there being no change ofair, but with the shutter open, the air isdrawn into the chamber with each inhala-tion and expelled ateach exhalation. Theresistance which theair meets
. Modern medicine and bacteriological review. the mouth and nose. Thischamber is provided with a second open-ing, the size of which is controlled by ashutter, which can be adjusted at use, the patient under examinationbreathes into this chamber, which maybe called the breathing chamber of theinstrument. With the chamber com-pletely closed, the breath would simplypass from the mouth into the chamberand back again, there being no change ofair, but with the shutter open, the air isdrawn into the chamber with each inhala-tion and expelled ateach exhalation. Theresistance which theair meets in passingthrough the shutteredopening gives rise tochanges in pressurewithin the breathingchamber, the pressurebeing diminished dur-ing inspiration andincreased during ex-piration. The amountof this change in 1pressure will depend!upon the size of theopening, and can beexactly measured byconnecting the breath-ing chamber with awater column. Theaverage pressurewhich I have observed is equivalent to acolumn of water one half inch in Pneograph. 186 ORIGINAL ARTICLES. This is certainly an amount too smallseriously to modify the form of the re-spiratory movements. The changes in pressure in the breath-ing chamber of course give rise to move-ments of the rubber diaphragm separat-ing the two chambers of the movements actuate in turn the dia-phragm of the recording tambour, whichwrites upon the recording cylinder in theusual way. That portion of the curveabove the base line represents expiration,that below, inspiration. The differencebetween the curves shown in Fig. 3 andthose in Fig. 4, Plate III, suggests theinterference with respiration through theincrease of abdominal pressure resultingfrom waist constriction. Gynecologists have often called atten-tion to the baneful influences of highheels in producing pelvic disease. Manyof the outline tracings which I havemade, very clearly confirm this carriage of the hips results in adepression of th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmedicine, bookyear189
