Saint Bartholomew's Hospital reports . owing across it again after eachaddition of fluid, we shall notice that the pitch of the note producedrises in proportion as the air-space in the tube becomes shorter. Clinically the bronchial breathing in different cases is charac-terised by differences in pitch. In some the pitch is low, like thatof the sound heard over the trachea in health ; in others high andthe sound whiffing. The production of unnatural sounds was demonstrated in thefollowing way :—A gutta-percha tube of about an inch in internaldiameter was moulded at one end so as to form a bifur
Saint Bartholomew's Hospital reports . owing across it again after eachaddition of fluid, we shall notice that the pitch of the note producedrises in proportion as the air-space in the tube becomes shorter. Clinically the bronchial breathing in different cases is charac-terised by differences in pitch. In some the pitch is low, like thatof the sound heard over the trachea in health ; in others high andthe sound whiffing. The production of unnatural sounds was demonstrated in thefollowing way :—A gutta-percha tube of about an inch in internaldiameter was moulded at one end so as to form a bifurcation intotwo smaller tubes, each having an internal diameter of somewhat 1 Page 193. On the Breath Sounds of Health and Disease. rpg more than half an inch, and to each of these was fitted an india-rubber tube of the same diameter and about six inches in inside of the whole apparatus was smooth. To the lower free ends of the india-rubber tubes equal-sizedbacs of india-rubber tissue were attached, as shown in the The artificial thorax being filled with air, the tubes, with thebags attached, were let through its roof as far as the dotted linein the figure. By working the handle of the bellows air wasdrawn in and out of the bags. During the inspiration and expi-ration thus caused a gentle murmur was produced, probably atthe open ends of the tubes. The loudness of the murmur de-pended upon the force with which the respirations were performed,and by working with a proper force the sound could be made veryfaint indeed. If, when this was the case, one of the smaller tubeswas nipped, so as to prevent any air passing through it, the soundsbecame much louder. The expiratory sound was increased morethan the inspiratory. The character of the sound also changed;a note could be detected in it whose pitch varied with the part ofthe tube pinched—tiie shorter the length of tube between thebifurcation and obstruction the higher was the note. The sounds could be heaid ei
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1865
