Part IB Advanced Physics Course

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Harrison's amazing chronometers

Go to Greenwich and see them still working!
Also, read the wonderful book `The Quest for Longitude' Harvard College Press, from which these copyright pictures are lovingly copied.

In 1762, at the end of a 147-day sea voyage, H4 (below) had lost only 1 minute and 55 seconds.

H1 (c) Harvard College Press
H4 (c) Harvard College Press Harrison (c) Harvard College Press

Site last modified Wed Aug 17 16:39:36 BST 2005