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the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun] > instrument displaying change (3)
oscillograph1893

Electronics. A device for recording oscillations, esp. those of an electric current. Also: a cathode-ray oscilloscope.

oscilloscope1909

A device for recording oscillations; = oscillograph, n. 2a. Now: spec. (more fully cathode-ray oscilloscope) an electronic instrument in which a…

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