kymograph

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ky·mo·graph

(kī'mō-graf),
An obsolete instrument for recording wavelike motions or modulation, especially for recording variations in blood pressure; it consists of a drum usually revolved by clockwork and covered with smoked paper upon which the curve is inscribed by a stylet or other writing point.
[G. kyma, wave, + graphō, to record]

kymograph

(kī′mə-grăf′)
n.
An instrument for recording variations in pressure, as of the blood, or in tension, as of a muscle, by means of a pen or stylus that marks a rotating drum.

ky′mo·graph′ic adj.

ky·mo·graph

(kī'mō-graf)
An instrument for recording wavelike motions or modulation of body organs (e.g., heart, great blood vessels); it consists of a drum revolved by clockwork and covered with smoked paper on which the curve is inscribed by a writing point.
[G. kyma, wave, + graphō, to record]

kymograph

the revolving drum used in investigations of the physiology of nerves and muscles. Usually, it is capable of rotating at different known speeds and carries a piece of graph paper on which a trace is produced by a lever connected to the physiological preparation.

kymograph

an instrument for recording variations or undulations, arterial or other.