object
Rolling-ball clock
A named clock that times intervals by balls rolling on inclined tracks. Not an hourglass, not a clepsydra, and not a bare ball dump.
Also known as Ball-rolling clock · Inclined-plane clock
object
A named clock that times intervals by balls rolling on inclined tracks. Not an hourglass, not a clepsydra, and not a bare ball dump.
Also known as Ball-rolling clock · Inclined-plane clock