 The competition winner was Harrison’s Sea Watch chronometer, in essence a super-accurate clock which functioned despite the rock and roll of the ship, and enabled a hitherto unimaginable level of navigational accuracy, driving Great Britain’s maritime empire to ever greater heights.Harrison received his official award only after repeated appeals and indeed the intervention of George III.Harrison made only four chronometers, but his work was carried on by others, and (generally London-based) chronometer houses sprang up, great names like John Arnold, Edward John Dent, Thomas Earnshaw, Charles Frodsham, Hamilton, and Robert Molyneux.