An early form of cathode ray tube device used to record electrical signals or produce images through electron beam deflection.
From 'cathode' (Greek 'kathodos' meaning way down) plus 'graph' (Greek 'graphia' meaning writing or recording). Developed in the late 19th/early 20th century.
The cathodegraph was an ancestor of modern oscilloscopes and television screens—scientists realized they could use electron beams to both measure electricity and paint images, creating the technology that would eventually fill our homes.
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