The Encyclopedia Americana, Volume 7Grolier, 1988 - Encyclopedias and dictionaries |
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Page 89
EGYPTIAN WATER CLOCK of about 1400 B. C. ( plaster cast ) . The clock was filled with water to the topmost mark of ... clocks were also used to a very limited extent . The hour scales were marked on the side of the candle or on the ...
EGYPTIAN WATER CLOCK of about 1400 B. C. ( plaster cast ) . The clock was filled with water to the topmost mark of ... clocks were also used to a very limited extent . The hour scales were marked on the side of the candle or on the ...
Page 90
CLOCK CLOCK CLOCK CLOCK Terry & Andrews clock with an ogee. 90 DE WYS , INC . SPANISH SANDGLASS of the 17th ... clocks employed a device called a fusee to equalize the force of the uncoiling spring . The spring is contained in a ...
CLOCK CLOCK CLOCK CLOCK Terry & Andrews clock with an ogee. 90 DE WYS , INC . SPANISH SANDGLASS of the 17th ... clocks employed a device called a fusee to equalize the force of the uncoiling spring . The spring is contained in a ...
Page 95
... clock more accurate than the Shortt clock . In 1942 the Greenwich Observatory replaced its Shortt clocks with quartz crystal clocks . The most accurate clocks utilize the oscilla- tions of atoms and molecules for regular motion . These ...
... clock more accurate than the Shortt clock . In 1942 the Greenwich Observatory replaced its Shortt clocks with quartz crystal clocks . The most accurate clocks utilize the oscilla- tions of atoms and molecules for regular motion . These ...
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