Longitude

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and a self-educated person who was accredited for finding by means of a timekeeper. John built his first pendulum watch in 1713. It was constructed entirely out of wood. Harrison called his first sea clock Harrison’s No. 1 or H-1 for short. H-1 was bar-shaped, built out of shinny brass, and was big in size. His second attempt was called H-2. H-2 was a heavy weight of 86 pounds, but fitted into a small box as John promised it would. H-2 was also bar-shaped and included an implement to ensure a unchanging drive and a more agreeable temperature reimbursement device. Although its motion was adequately regular and exact for finding the of a ship within the nearest limits proposed by the Parliament, H-2 was not good enough for Harrison. So, Harrison devoted nineteen years to build H-3. The H-3 was the leanest of the sea clocks and was small enough to meet the definition of “shipshape.” H-3 contained bearings in the caged ball that smoothened the ...

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