# How did Archimedes's water clock work?

I read that several principles of Al-Jazari's monumental water clocks were based upon earlier designs of water clocks by Archimedes, for example the use of valves, feedback system and flow control regulator. Apparently, Archimedes even wrote a treatise On the Construction of Water Clocks. So what innovations did Archimedes introduce in his hydraulic clock?

• The short answer: it is not known. A treatise of Archimedes if he wrote one, did not survive. There is no descriptions of clocks made by Archimedes, if he made any. The rest is useless speculation – Alexandre Eremenko Oct 6 '15 at 21:19