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H-1

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.

H-2

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.

H-3

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.

H-4

This object is five inches in diameter and is absolutely beautiful, including diamond mechanisms and a silver case.

H-5

This object was accurate to within one second of a day and tested by King George III's private scientist.

K-1

This object was selected by Captain Cook to go on his...

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