The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 90
... clock and the bracket clock . In France the evolution was to the mantel clock , which became very ornate in the 18th century . Balance Spring . An innovation in clocks paral- lel to that of the pendulum was the application of the ...
... clock and the bracket clock . In France the evolution was to the mantel clock , which became very ornate in the 18th century . Balance Spring . An innovation in clocks paral- lel to that of the pendulum was the application of the ...
Page 94
... clocks and to AMERICAN CLOCK AND WATCH MUSEUM , INC .. BRISTOL CONN . supply the regular motion necessary for time- keeping . It has enabled a single central master clock to control the dials of a number of remote clocks , and thus ...
... clocks and to AMERICAN CLOCK AND WATCH MUSEUM , INC .. BRISTOL CONN . supply the regular motion necessary for time- keeping . It has enabled a single central master clock to control the dials of a number of remote clocks , and thus ...
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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