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İzah 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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Mənbə Abraham Rees (1819) "" in Cyclopædia: or, a New Universal Dictionary of Arts and Sciences The image is the published 2007-02-01 by the .
Müəllif The illustrator was probably w:John Farey, Jr. (1791–1851). The principal engraver for the encyclopedia was Wilson Lowry (1762–1824).
Digər versiyalar Image:Clepsydra-Diagram-Fancy.png

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References

  1. Frances Robertson (2005-01). "". Technology and Culture 46 (1): 31-50.

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296 × 558 (27 KB) {{Information |Description=Diagram of a fancy clepsydra. 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

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