. A text-book of physiology : for medical students and physicians . Fig. 228.—Mareys cardiograph. The button on the tambour is pressed upon thechest over the apex. The movements are transmitted through the tube to the right to arecording tambour. The Cardiogram.—The apex beat may be recorded easily bymeans of appropriate tambours. Several instruments have beenespecially devised for this purpose and are designated as cardio-graphs. The cardiograph described by Marey is shown in Fig. consists essentially of a tambour inclosed in a metal box. The. Fig. 229. -Two cardiograms from the same i
. A text-book of physiology : for medical students and physicians . Fig. 228.—Mareys cardiograph. The button on the tambour is pressed upon thechest over the apex. The movements are transmitted through the tube to the right to arecording tambour. The Cardiogram.—The apex beat may be recorded easily bymeans of appropriate tambours. Several instruments have beenespecially devised for this purpose and are designated as cardio-graphs. The cardiograph described by Marey is shown in Fig. consists essentially of a tambour inclosed in a metal box. The. Fig. 229. -Two cardiograms from the same individual to show characteristic records:Beginning of systole; b-c, systolic plateau.—(After Marey.) rubber membrane of the tambour carries a button which can bebrought to bear, under a suitable pressure, upon the apex of theheart. The movements of this button cause pressure changes inthe air of the tambour which are transmitted through tubing to a THE HEART BEAT. 547 recording tambour and recorded on a kymographion. A simpleand effective cardiograph may be made by pressing a funnelagainst the skin over the apex and connecting the stem of thefunnel by tubing to a suitable recording tambour. The car-diograms obtained by such methods have been the subject ofmuch discussion. The form of the curve varies somewhat withthe instrument used, the way in which it is applied, the position ofthe heart apex with reference to the chest wall, and with the con-ditions of the circulation, and it is often difficult to give it a correctinterpretation. An uncom
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