Product images of Marine chronometer in case
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Marine chronometer in case
A marine chronometer numbered 4576, by A. Johannsen & Co. It has a two-day full-plate fusee movement with four pillars, all fixed with blued screws. The movement is marked with the broad arrow. The fusee, with stop-work and Harrison's maintaining power, has a pipe round the winding square. There is an Earnshaw-type spring detent escapement and a two-arm balance with a helical balance spring.
- Image reference: F1199
- National Maritime Museum, Greenwich, London, Ministry of Defence Art Collection