Figure 3 of 10 relating to Harrison's 4th marine timekeeper taken from 'The Principles of Mr Harrison’s Timekeeper’ (1767)

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Figure 3 of 10 relating to Harrison's 4th marine timekeeper taken from 'The Principles of Mr Harrison’s Timekeeper’ (1767) Credit line: © National Maritime Museum, Greenwich, London Object: ZAA0643.3 Artist: unknown Date: 1767 Medium: paper Size: 220 mm x 172 mm Click here to buy a bespoke print of this image.