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| Keywords: Clepsydra-Diagram-Fancy.jpeg Diagram of a fancy clepsydra this type being an automaton or self-adjusting machine Water enters and raises the figure which points at the current hour for the day Spillover water operates a series of gears that rotates a cylinder so that hour lengths are appropriate for today's date The ancient Greeks and Romans had twelve hours from sunrise to sunset; since summer days are longer than winter days summer hours were longer than winter hours cite book 1819 Abraham Rees Cyclopædia or a New Universal Dictionary of Arts and Sciences Clepsydra http //www antique-horology org/_editorial/clepsydra/ The image is the http //www antique-horology org/_editorial/clepsydra/Images/I3 jpg JPEG reproduction published 2007-02-01 by the http //www antique-horology org/ Horological Foundation 1819 The illustrator was probably w John Farey Jr 1791 “1851 The principal engraver for the encyclopedia was Wilson Lowry 1762 “1824 <ref> cite journal Frances Robertson The aesthetics of authenticity printed banknotes as industrial currency http //muse jhu edu/journals/technology_and_culture/v046/46 1robertson html Technology and Culture 46 1 2005-01 31-50 </ref> Image Clepsydra-Diagram-Fancy png PD-old References reflist Images from Rees's Cyclopædia Old water clocks prints Images by John Farey Jr Clepsydras in art | ||||
