Results 241 to 250 of about 453,042 (281)

Egyptian Water-Clocks

Nature, 1923
PERMIT a brief correction to the paragraph in NATURE of April 7, p. 479, on the casts presented to the Science Museum. The variable divisions of the water-clocks are not for different lengths of day, but compensations for the changes of viscosity of water, over 9° and 12° F. respectively.
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Al-Jazari’s Water Clocks

Nuncius, 2017
The water clocks of the 12th-century Islamic scientist Ismail Al-Jazari may be regarded as among the most outstanding engineering masterpieces in the history of science and technology in Persia. His other works testify to his remarkable ability in design methodology and in different aspects of mechanical engineering design and manufacture such as ...
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Archimedean unequal-hour water clock

Lettera Matematica, 2016
The paper describes a water clock built by a team of the Universita Tor Vergata of Rome. The clock was briefly described in a medieval Arabic manuscript, which attributed its paternity to Archimedes. A thin stream of water exits from a cylindrical tank in which pressure is kept constant by a feedback principle.
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The elephant water-clock

1974
The elephant water-clock from which can be told the passage of the constant hours.
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The beaker water-clock

1974
The Beaker (Ka’s) Water-Clock From it the passage of the constant hours, and their divisions, can be told.
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2015-Goodnow-EtAl-Mathematical Models of Water Clocks

2023
This is a historical tour of water clocks, known as clepsydra a Greek word meaning water thief. These devices were for telling time.
Goodnow, Jennifer, Orr, Richard, Ross, David   +2 more
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Cultural Interchange Over a Water-Clock

The Classical Quarterly, 1973
It once seemed almost self-evident that the extraordinary progress of Greek astronomy and mathematics in the Hellenistic age were, at least in part, the result of contact with Babylonian and Egyptian culture. But, whatever they may have owed to Babylonia in the exact sciences, there is now a growing consensus that even as early as Eudoxus the Greeks ...
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Feedback control in ancient water and mechanical clocks

IEEE Transactions on Education, 1992
Attention is focused on Ktesibios' water clock and the outstanding mechanical clocks based on the crown wheel escapement that first appeared in Europe at the end of the thirteenth century. Specifially, block diagrams and the related equations are derived for both the Ktesibios and the verge and foliot clock.
A. LEPSCHY, G. A. MIAN, VIARO, Umberto
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The castle water-clock

1974
A water-clock (binkām) from which can be told the passage of the solar hours; this is divided into 10 sections.
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Bending time: The tubular water clock

American Journal of Physics
A water clock is a device that is either filled or drained and shows time through a changing water level. The ancient design challenge is to fashion a container where the water level rises or falls at a constant rate, and thus sweeps out equal height intervals in equal time intervals.
Keith Zengel, Hong-An Luu, Samuel Stollman   +2 more
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