A graphical record or diagram showing harmonic relationships or vibrations, made by a harmonograph.
From harmono- (combining form from harmony) + -gram suffix meaning 'a recording or picture' (from Greek graphein 'to write'). This follows the pattern of scientific -gram words like electrocardiogram.
Harmonograms are the visual output of a harmonograph machine—they're beautiful spiraling patterns that look almost like art but are actually precise records of how different vibrations interact. In the 1800s, before modern oscilloscopes, these were one of the few ways to visualize sound and vibration.
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