What water clock (clepsydra) is made of
Measuring time by the outflow of water.
- Vessel with an outflow hole — has part. Water flows out at a nearly constant rate.
- Water level markings — has part. Hour marks on the wall.
- Gravity flow — uses. Water flows out at a constant rate under gravity.
- Stone — is made of. The clepsydra from Karnak is a stone vessel.