An instrument that records or measures changes in power, force, or energy; a device that graphically displays dynamic measurements.
From Greek dynamis (power) + -graph (writing/recording device). This scientific instrument emerged in the 19th century alongside other precision measuring devices.
The 'dynamograph' belongs to a family of measurement instruments (seismograph, cardiograph, telegraph) that all use '-graph' to mean 'record'—a testament to how Greek roots became the building blocks of modern scientific vocabulary.
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