Technology
Automatic watches wind their own springs using your wrist
HERE’S THE INTERESTING PART
You are the primary power source, violently swinging your arm around to keep a tiny metal spring tightly coiled. Inside the case, a freely rotating, heavy semi-circular metal weight pivots on a bearing. Every time you walk, gesture, or reach for a coffee, that tiny weight swings back and forth, driving a gear train that quietly winds the mainspring up tight.
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