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An image showing 'Part of John Harrison's third timekeeper (H3). John Harrison, 1745.'
An image showing 'Drawing of part of the Harrison clock H3. 1745'
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Part of John Harrison's third timekeeper (H3)

An original manuscript drawing by Harrison of parts of H3 during its evolution, probably in the late 1740s. The drawing shows the rear of the clock with the detail of the special isochronising device with the caged roller bearing and the elaborate ‘saddle piece’ to attempt to force the balances into isochronal behaviour.
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Object Details

ID: ZAA0882
Collection: Timekeeping
Type: Drawing
Display location: Not on display
Creator: Harrison, John
Date made: 1745
People: Harrison, John
Credit: National Maritime Museum, Greenwich, London
Measurements: Frame: 450 x 603 x 27 mm
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