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Part of John Harrison's third timekeeper (H3)


Object connections:

Collection Timekeeping
User collections John Harrison by NMMCollections
Gallery locationNot on display

Object details:

Object ID ZAA0882
Description 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.
Date made 1745

Artist/Maker Harrison, John
Place made London
Credit National Maritime Museum, Greenwich, London
Materials paper
Measurements Frame: 450 x 603 x 27 mm
  • Part of John Harrison's third timekeeper (H3) (ZAA0882)
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