Kymograph

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kymograph

[′kī·mə‚graf]
(industrial engineering)
A device used to measure extremely short work time intervals by using a system of transducers that are activated by an operator performing a job, with the impulses recorded as a function of time.
(medicine)
A device for recording internal body movements by making tracings with a stylus on a revolving smoked drum.

Kymograph

 

an instrument that graphs certain physiological processes, such as heartbeat, respiration, and muscle contractions.

A mechanical kymograph was used for the first time by the German physiologist K. Ludwig in 1847 to record changes in blood pressure. The apparatus consisted of a metal drum, covered with smoked paper and evenly rotated by a clock mechanism. A stylus attached to a rod and connected to the contracting heart, muscle, or other functioning organ describes a curve on the drum.

The speed of rotation of the kymograph is regulated by the movement of a friction clutch along the axis and depends on the dimensions of an air brake. Electrokymographs are used for investigations demanding greater accuracy. These kymographs ensure a constant but easily regulated speed of movement. The driving drum of the electrokymograph is set in motion by an electric motor.

I. N. D’IAKONOVA

References in periodicals archive ?
In their attempt "to show that living organisms could be treated like machines," (19) whose functions were rational and observable rather than the effect of some immaterial (and so immeasurable) "vital" force, the experimental physiologists coming of age in the 1840s used an array of specially designed instruments-many of which, such as Ludwig's kymograph (Fig.
(26) Building on previous theoretical work--Fourier's analysis of harmonics, Ohm's physics of musical sounds, and "Muller's law of specific nerve energies"--Helmholtz innovated acoustical research not only by providing ample "supporting experimental evidence" but also by devising and using in his laboratories a collection of tuning forks and resonators, as well as specially adapted instruments such as the kymograph, to isolate, amplify, and record all manner of "rapid elastic vibrations" (from the sounds of stringed musical instruments to those of real and synthesized voices) (Green and Butler, pp.
Detailing experiments conducted using a Zimmermann kymograph, she confidently announces that "the foot is a fact." Curiously out of step, so the speak, with most other acoustical prosodists of her day, Snell found in technology a defense of traditional foot-based versification: the only truly "scientific method of scansion," she observes, "is one which uses the symbols conventionally used for indicating quantity and which also uses stress marks." (58) Conventional wisdom, it would seem, dies hard.
(59) Thus Borell describes how the kymograph allowed physiologists "to monitor a wide range of physiological events." Undoubtedly, it served a similar function for psychologists intent on "monitoring" metrical "events." See "Training the Senses, Training the Mind," p.