Marine timekeeper H3 with case
Marine timekeeper, H3. Started in 1740, this third timekeeper took Harrison nearly 19 years to build and adjust, although it was not to win him the great longitude prize: he found that he just could not persuade the two large, heavy, circular balances to keep time well enough. Nevertheless, H3 incorporates two extremely important inventions, both relevant today: the bimetallic strip (still in use worldwide in thermostats of all kinds) and the caged roller bearing, a device found in nearly all modern mechanical engineering. See also ZAA0034 (H1), ZAA0035 (H2) and ZAA0037 (H4).
- Image reference: D6785_5
- National Maritime Museum, Greenwich, London, Ministry of Defence Art Collection
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