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London-British Museum-Gold Pocket Chronometre44

London-British Museum-Gold pocket watch46

1836 Hunt and Roskell were retailers of fine jewelry and watches in London during the 1800s. This pocket chronometre has its escapement mounted on a tourbillon -- a constantly rotating carriage that reduces errors in timekeeping when the position of the watch changes. Hunt and Roskell, London Fusee, spring detent escapement, balance with spherical spring, temperature compensation (P&E CAI-299)
aperture=f9.0 focal length: 60.0 mm exposure 1/800 sec ISO: 3200

London-British Museum-Gold Pocket Chronometre44

London-British Museum-Gold pocket watch46
Album created by album from D. Madison's Marginal Hacks Wed Dec 21 21:19:39 2016