A recording instrument that uses a spinning stylus or rotor to mark measurements or data, particularly in scientific and meteorological applications.
Compound of 'gyro-' (spinning) and '-graph' (Greek graphein meaning 'to write'). Developed as a measurement tool in the 19th and 20th centuries.
Gyrographs were the ancestors of modern digital sensors—they literally recorded spinning data onto paper, creating circular patterns that encoded scientific information!
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