. Carnegie Institution of Washington publication. PHYSIOLOGY OF MOUTH-BREATHING APPLIANCES. 183 lungs each time and that the residual volume in the lungs and the temperature conditions remain constant. Any alteration in the resid- ual volume would alter the base of the respiration tracings on the kymograph. This, of course, does occur occasionally in a deep inhala- tion, but the low points of the tracings which mark the limits of expira- tion are remarkably uniform after the first few respirations of the period, and the rate at which these points rise give a very fair index of the rate of oxyg
. Carnegie Institution of Washington publication. PHYSIOLOGY OF MOUTH-BREATHING APPLIANCES. 183 lungs each time and that the residual volume in the lungs and the temperature conditions remain constant. Any alteration in the resid- ual volume would alter the base of the respiration tracings on the kymograph. This, of course, does occur occasionally in a deep inhala- tion, but the low points of the tracings which mark the limits of expira- tion are remarkably uniform after the first few respirations of the period, and the rate at which these points rise give a very fair index of the rate of oxygen consumption. The method, however, is intended merely as an approximate comparison, for the volumes thus read are apparent volumes and, like those for the pulmonary ventilation, are uncorrected for temperature changes. The lower record (A) in figure 15 is the reproduction of a kymograph tracing when the subject was standing and shows the rise in the curve as the oxygen was absorbed from the ventilating circuit, without re- newal. The upper record (B) in the same figure was obtained with the subject walking, and indicates the points at which the main spirom- eter was refilled from the duplicate spirometer. ini n mimtHh i un 11 m M ii H-HH. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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