This model is strongly based upon the designs of Clepsydra Clocks. These pieces are considered, along with sundials and hourglasses, to be the oldest of time-measuring instruments. Used widely up until the invention of mechanical clocks in the late 1300’s, these would have been the primary timekeepers of the medieval period. With the steady dripping of water through the attached funnel, water rises in a container with a float, and as the float rises, the hand (only one hand was possible here) of the clock turns slowly, pushed by the steadily rising water and the rotating gear. http://www.usgennet.org/usa/topic/preservation/science/inventions/images/pg50.jpg https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=&url=https%3A%2F%2Fmedia.licdn.com%2Fmpr%2Fmpr%2Fshrinknp_400_400%2FAAEAAQAAAAAAAAPQAAAAJGE0MTdjMTJhLTUyMjMtNGE0OS05M2VmLWFlNzI2ZWU0M2E4Yg.jpg&bvm=bv.133178914,d.eWE&psig=AFQjCNESlv6BOYyoQ_d8tsbuby843Kd6bg&ust=1474468887415423
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