F1197

Marine chronometer in case Long Caption: A marine chronometer numbered 4584, by A. Johannsen & Co. I 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 two-arm balance with a helical balance spring. Credit line: © National Maritime Museum, Greenwich, London, Ministry of Defence Art Collection Object: LOA0136 Artist: Johannsen Date: circa 1896 Medium: metal; wood; glass Size: 190 mm x 190 mm x 190 mm Click here to buy a bespoke print of this image.