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kymograph
A kymograph (which means 'wave writer') is a device that gives a graphical representation of spatial position over time in which a spatial axis represents time. It basically consists of a revolving drum wrapped with a sheet of paper on which a stylus moves back and forth recording perceived changes of phenomena such as motion or pressure.〔(Photo and Description of a 1903 kymograph dead link )〕
It was invented by German physiologist Carl Ludwig in the 1840s and found its first use as a means to intrusively monitor blood pressure, and has found several applications in the field of medicine.〔(Primary source texts and quotes on kymographs )〕 Its primary use was to measure phenomena such as changes in muscular contractions or other physiological processes, including speech sounds. Kymographs were also used to measure atmospheric pressure, tuning fork vibrations, and the functioning of steam engines.
==See also==
* Videokymography
* Depth kymography
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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