kymograph
/ˈkaɪməˌɡræf/
noun
- An instrument that records variations in pressure, motion, or other physical quantities over time, typically by tracing a line on a moving paper or digital display.
- The old kymograph in the lab used a rotating drum and a pen to draw wave patterns.
- The invention of the kymograph helped scientists study breathing and heart rates more accurately.
- Doctors once used a kymograph to measure and record a patient's pulse.