An instrument that records the speed and flow patterns of blood movement through vessels as a written or graphical record.
From 'hemo-' (blood) + Greek 'dromos' (course) + '-graph' (write/record). This 19th-century instrument combined the emerging technologies of blood flow measurement with mechanical recording, similar to an electrocardiograph.
Imagine having a machine that actually drew pictures of how fast your blood moved—these early hemodromographs produced wiggly paper recordings that doctors could study, like a primitive ultrasound made of ink and timing.
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