Un livre de textes de physiologie, pour les étudiants en médecine et les médecins . ertia facteur est pratiquement éliminé la diffi-culty d'obtenir un traçage, en particulier à partir d'une impulsion faible, est proportionnellement augmenté, Et dans les sphygmographs les plus couramment utilisés, tels que le Dudgon, l'installation en application est obtenue au détriment de la correction incomplète de l'erreur d'inertie. L'onde d'impulsion obtenue à partir de l'artère radiale est representedans la Fig. 211. Il sera vu de ce chiffre que l'artère se dilatesrapidement et puis tombe plus lentement, mais il doit être tenu en conscience que l'apex très pointé de la W

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A text-book of physiology, for medical students and physicians . ertia factor is practically eliminated the diffi-culty of obtaining a tracing, especially from aweak pulse, is correspondingly increased, and inthe sphygmographs most commonly employed, such as the Dudgeon, facility in application isobtained at the expense of incomplete correction of the error of inertia. The pulse wave obtained from the radial artery is representedin Fig. 211. It will be seen from this figure that the artery dilatesrapidly and then falls more slowly, but it must be borne in mindthat the very pointed apex of the wave recorded by this form ofsphygmograph is due to the instrumental error referred to above, namely, the fling of the lever caused by the sudden expansion Fig. 210.—The lever ofthe Dudgeon sphygmograph:P, The button of the spring F, to be placed upon the artery.The movement is transmittedto the lever, F, and thence tothe bent lever, F2, whosemovement is effected throughthe weight, g. The writingpoint S, of this lever makesthe record on the smoked sur*face, A.. Fig. 211.—Sphygmogram from the radial artery, Dudgeon sphygmograph: D, The dicroticwave; P, the predicrotic wave. of the artery. The ascending portion of the wave is spoken of asthe anacrotic limb, the descending, as the catacrotic limb. Underusual conditions the anacrotic limb is smooth, —that is, shows nosecondary waves, —while the catacrotic limb shows one or moresecondary waves, which are spoken of in general as the catacroticwaves. The most constant of these latter waves occurs usually 510 CIRCULATION* OF BLOOD AND LYMPH. approximately at the middle of the descent (D) and is designatedas the dicrotic wave. A less conspicuous wave between it and theapex of the pulse wave is known usually as the predicrotic wave, P, while the wave or waves following the dicrotic are designated aspostdicrotic. These catacrotic waves are too small, under normalconditions, to be felt by the finger. Under certain abnormalconditions, ho

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