A medical instrument that records and measures involuntary movements or lack of muscular coordination by creating a visual trace on paper.
Greek ataxia (lack of order) plus -graph (instrument for writing or recording). Developed in the late 1800s as neurology advanced and doctors sought mechanical ways to document movement disorders.
This device turns invisible neurological chaos into visible squiggles—it's essentially a tremor printer that let doctors 'see' their patients' nervous system misfires before digital technology existed.
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