De quoi est fait water clock (clepsydra)
Measuring time by the outflow of water.
- Vessel with an outflow hole — a pour partie. Water flows out at a nearly constant rate.
- Water level markings — a pour partie. Hour marks on the wall.
- Gravity flow — utilise. Water flows out at a constant rate under gravity.
- Stone — est fait de. The clepsydra from Karnak is a stone vessel.