. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. 424 Historical curve is further prolonged backward ... so that the curve as a whole assumes the form of the segment of a sphere. The changes which we have just described are proportional to the strength of the air pressure and to the duration of the stay in compressed air and consequently are more marked and more pro- nounced as the air pressure is carried higher and the stay in the ap- Fig. 10 paratus is lengthened. We find then that the indications p
. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. 424 Historical curve is further prolonged backward ... so that the curve as a whole assumes the form of the segment of a sphere. The changes which we have just described are proportional to the strength of the air pressure and to the duration of the stay in compressed air and consequently are more marked and more pro- nounced as the air pressure is carried higher and the stay in the ap- Fig. 10 paratus is lengthened. We find then that the indications produced after twenty minutes of maximum pressure, that is, the visible ob- liquity of the line of ascent, the shortening of the wave, the rounded flattening of the top, and the transformation of the wavy line of descent into a straight line or a simple convex line, after an hour and a half, that is, after an hour of exposure to the constant maxi- mum pressure, take on a still more evident character, so that the tracing of the pulse finally presents, so to speak, only a straight Fig. 11 In these four figures letter a indicates the sphygmographic tracing obtained under normal pressure; b is the tracing while the pressure is rising in the apparatus; c, during the period of constant compression; d, after return to normal pressure. Fig. 11, ai was taken while the pressure was increasing; Ci while it was decreasing. Upon return to normal atmospheric pressure, immediately after the treatment, the curve resumes its original form, or only partially returns to it, or, somewhat frequently, the change when it has once begun in the blood curve undergoes a downward movement. Figure 9 expresses all these different 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 Bert, Paul, 1833-1886; Hitchcock, Mary Alice;
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