Galileo Singing

Galileo did not have clocks accurate enough for his experiments so to measure acceleration he built a ramp with a groove down which he rolled a brass ball as he sang. On each beat of the song he marked the slope with a wire, so the ball clicked as it passed. The distance between the wires showed the ball’s acceleration.
Singing seems an odd way to measure time, as we now determine music from automated clicks, but there were a lot of work songs, from sea shanties to grape crushing, fulling wool, kneading bread, so must have been both common and they were used to singing together so holding a steady rhythm. 

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