https://hackaday.com/tag/oscillograph/
Oscillograph | Hackaday
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https://www.merriam-webster.com/dictionary/cathode-ray%20oscillograph
CATHODE-RAY OSCILLOGRAPH Definition & Meaning - Merriam-Webster
The meaning of CATHODE-RAY OSCILLOGRAPH is an oscillograph in which the moving element is a vibrating beam of cathode rays.
cathode rayoscillographdefinitionmeaningmerriam