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.
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It was bought by Astronomer Royal Frank Dyson for the Greenwich Observatory.
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The story begins with John Harrison, as documented in Dava Sobel's book Longitude and its British television adaptation.
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