clepsydra


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to clepsydra: water clock

clepsydra

(klĕp`sĭdrə) or

water clock,

ancient device for measuring time by means of the flow of water from a container. A simple form of clepsydra was an earthenware vessel with a small opening through which the water dripped; as the water level dropped, it exposed marks on the walls of the vessel that indicated the time that had elapsed since the vessel was full. More elaborate clepsydras were later developed. Some were double vessels, the larger one below containing a float that rose with the water and marked the hours on a scale. A form more closely foreshadowing the clock had a cord fastened to the float so that it turned a wheel, whose movement indicated the time. A further step was the use of gear wheels and a turning pointer. It is believed that clepsydras were used in Egypt c.2000 B.C.; from Egypt they were introduced into Greece and later from there into Rome.
References in periodicals archive ?
ACROSS: 2) sundial 4) clepsydra 5) pendulum 9) century 11) sixty 12) week.
Henry Cecil has just one runner this afternoon and CLEPSYDRA (4.
A clepsydra is a water clock: it measures time by the discharge of water.
H Offer loads of product information: Web stores may not create the touch-and-feel immediacy of a well-designed package in a retail store, but the Web can do a far better job of answering key customer questions, says Segiu Simmel of Clepsydra Systems.
The Greeks called the device a clepsydra (water-stealer), since the water quietly leaked out of the upper chamber.
CLEPSYDRA A Jingle in two short couplets B Critical period C Water clock who am I?
Timepiece 5m Zamindar - Clepsydra K Abdullah 411328-RPR 116 OR 114 She won a Group 1 at 1m last summer and has her share of speed but I think she'll be better at 1m2f this season.
The crescent, yes that alone on the iron face of the clock, for a weight suspending Lucifer, always wounds, always another hour wept in dark drops by the clepsydra, when she, abandoned, wanders, and in her shadow never an angel dogs her inexpressible steps
Soviet Moon, responsible for the 2010 Derby and Arc hero Workforce, will be covered by Zamindar, as will Clepsydra, dam of last year's Falmouth Stakes winner Timepiece, who is by Zamindar.
After Dictionary of the Khazars (1984), a novel in the form of a lexicon, after Landscape Painted with Tea (1988), a novel in the form of a crossword puzzle, Pavic's next novel, The Inner Side of the Wind, or the Novel of Hero and Leander (1991) is a novel in the form of a clepsydra, the ancient water instrument that measures time.