An instrument that automatically records time or events, or a device for creating automatic time-stamped records.
From Greek 'autos' (self), 'chronos' (time), and 'graphe' (write). The compound describes an automatic time-recording device.
Before digital timestamps, scientists and engineers built mechanical autochronographs to record when experiments happened—this obsession with precise timing enabled the railroad, aviation, and all synchronized modern systems.
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