This object was Harrison's first sea clock. It still exists today and weights seventy pounds, enclosed in a 4 x 4 x 4 foot cabinet. It worked spectacularly and passed tests on numerous occasions.
This object was built with a small loan from the Board of Longitude, with the agreement that it would be available for public use. However, this clock was never used at sea.
This object has 753 working parts and possessed numerous innovations that would balance against temperature and friction problems. It weighs only sixty pounds and has a simpler core design than previous designs.
This object is five inches in diameter and is absolutely beautiful, including diamond mechanisms and a silver case.
This object was accurate to within one second of a day and tested by King George III's private scientist.
This object was selected by Captain Cook to go on his...
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