De que é feito water clock (clepsydra)
Measuring time by the outflow of water.
- Vessel with an outflow hole — tem como parte. Water flows out at a nearly constant rate.
- Water level markings — tem como parte. Hour marks on the wall.
- Gravity flow — utiliza. Water flows out at a constant rate under gravity.
- Stone — é feito de. The clepsydra from Karnak is a stone vessel.