Clepsydra-Diagram-Fancy
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The illustrator was probably w:John Farey, Jr. (1791–1851). The principal engraver for the encyclopedia was Wilson Lowry (1762–1824).[1]
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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.
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Public domain
Credit:
Abraham Rees (1819) "Clepsydra" in Cyclopædia: or, a New Universal Dictionary of Arts and Sciences The image is the JPEG reproduction published 2007-02-01 by the Horological Foundation.
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Vodní hodinyVodní hodiny čili klepsydra byla původně nádoba s malým otvorem ve dně, kudy voda pomalu vytéká. Rysky v nádobě označovaly uplynulý čas. Klepsydra – podobně jako přesýpací hodiny – neměří tedy denní čas, nýbrž odměřuje časový interval. .. pokračovat ve čtení