float as the power drive system and uses a sundial to correct the water flow rate.

In medieval philosophical writings, the atom was a unit of time referred to as the smallest possible division of time. The earliest known occurrence in English is in Byrhtferth's Enchiridion (a science text) of 1010-1012, where it was defined as 1/564 of a momentum (11/2 minutes), and thus equal to 15/94 of a second. It was used in the computus, the process of calculating the date