An instrument that records wave-like motions or vibrations, producing a visual record on a moving surface.
From Greek kyma (wave) + -graph (to write/record). Developed in the 19th century for scientific measurement, particularly in physiology and physics, to capture the invisible patterns of movement.
Cymographs were like the original 'action cameras'—they could freeze the invisible world of waves, heartbeats, and vibrations into visible proof that things were moving, revolutionizing how scientists understood motion!
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