Astronomical Clock by Thomas Earnshaw
Earnshaw's second clock has a 5-bar
compensation
pendulum of steel and zinc, an 8-day movement, rated
at very nearly sidereal time. Its pallets and some of
the pivot holes are jewelled.
See also:
Thomas Earnshaw
Earnshaw No. 1
History of Armagh Observatory
Last Revised: 2009 November 5th
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