List of Physical Visualizations
and Related Artifacts
With tag “water-clock”

18000 BC – Water Clocks

A water clock (or clepsydra) is an instrument where time is measured by regulating a flow of liquid. The oldest water clocks simply consisted of a pierced bowl placed in a larger pot filled with water (see left image, Persian artefact from 400 BC). These existed back in the 16th century BC. The passage of time was observed by counting how many times the bowl overflowed and its […]

Added by Pierre Dragicevic. Category: Measuring instrument. Tags: , ,
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