An instrument that records or marks precise time intervals using electrical pulses or signals.
From electro- (electricity) + chrono- (time, from Greek chronos) + -graph (device that records). Developed in the late 19th century for precise scientific measurements and timing.
Before digital clocks, electrochronographs were how scientists measured extremely short time intervals—they used electrical pulses to mark timing with incredible precision, enabling breakthroughs in physics and engineering.
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