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1. Kendall's third attempt at a marine timekeeper, K3.
	K3 was Kendall's third device and was made for £100. It was taken by James Cook on his final voyage of discovery in the Pacific and by George...

2. The first pocket chronometer.
	John Arnold (1736-99) successfully found the way to simplify Harrison's timekeeper design. This watch, No 1/36, made in 1778, went so well on trial...

3. Kendall's second timekeeper, K2.
	K2 was a cheaper version of K1 produced by Kendall for £200. However, while Kendall was a first-rate watchmaker, he was not a good designer and...

4. John Harrison's third marine timekeeper, H3.
	Started in 1740, H3 took Harrison nearly 19 years to build and adjust, although it was not to win him the longitude prize: he found that he just...

5. John Harrison's fourth marine timekeeper, H4.
	Harrison had been working on improving watches as a sideline to his development of the much larger H3. In 1753 a pocket watch was made for Harrison,...

6. John Harrison's second marine timekeeper, H2.
	Made between 1737 and 1739, the H2 is a larger and more solidly built version of H1, with the additional refinement of a remontoire, a device to...

7. Astronomical chronometer.
	Thomas Earnshaw made this watch for George Margetts to Margett's design of complex astronomical dialling, but incorporating Earnshaw's spring detent...


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