. Kirkes' handbook of physiology . Fig. 161.—Apparatus of MM. Chauveau and Marey for Estimating the Variations of Endo-cardiac Pressure, and Production of the Impulse of the Heart. the heart of living animals—the horse. These bags were connected bymeans of long narrow tubes with three levers arranged one over the otherin connection with a registering apparatus, figure 161. The synchronismof the impulse with the contraction of the ventricles is also well shown by. Fig. 162.—Tracings of 1, Intra-auricular; 2, Intraventricular Pressures; and 3, of the CardiacImpulse of the Heart. To be read from
. Kirkes' handbook of physiology . Fig. 161.—Apparatus of MM. Chauveau and Marey for Estimating the Variations of Endo-cardiac Pressure, and Production of the Impulse of the Heart. the heart of living animals—the horse. These bags were connected bymeans of long narrow tubes with three levers arranged one over the otherin connection with a registering apparatus, figure 161. The synchronismof the impulse with the contraction of the ventricles is also well shown by. Fig. 162.—Tracings of 1, Intra-auricular; 2, Intraventricular Pressures; and 3, of the CardiacImpulse of the Heart. To be read from left to right. Obtained by Chauveau and Marey. means of the same apparatus, and the causes of the several vibrations ofwhich it is really composed have been demonstrated. In the tracing, figure 162, the intervals between the vertical lines rep-resent periods of a tenth of a second. The parts on which any given verticalline falls represent simultaneous events. It will be nees that the contraction ENDOCARDIAL PRESSURE 165 of the auricle, indicated by the marked curve at A in the first tracing, causesa slight increase of pressure in the ventricle which is shown at A in the secondtracing, and produces also a slight impulse, which is indicated by A in thethird tracing. The closure of the semilunar valves causes a momentarilyincreased pressure in the ventricle at Dr, affects the pressure in the auricle D,and is also shown in the tracing of the cardiac impulse
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