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Updated: June 8, 2025
It reappeared in the writings of the time of the great teachers who arose in France and Germany about 1825. To-day, in case of need, we have instruments which write in instructive curves the form of the pulse-wave, and enable us to settle questions which sometimes could not be settled without this delicate means.
Listen to the heart-beat of some friend. Experiment 102. To show how the pulse may be studied. "The movements of the artery in the human body as the pulse-wave passes through it may be shown to consist in a sudden dilatation, followed by a slow contraction, interrupted by one or more secondary dilatations.
For instance, the pulse-wave travels at the rate of about 30 feet a second, and takes about 1/10 of a second to reach the wrist, while the blood itself is from 3 to 5 seconds in reaching the same place. The pulse-wave may be compared to the wave produced by a stiff breeze on the surface of a slowly moving stream, or the jerking throb sent along a rope when shaken.
The throb of the two carotid arteries may be plainly felt by pressing the thumb and finger backwards on each side of the larynx. The progress of the pulse-wave must not be confused with the actual current of the blood itself.
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