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London-British Museum-Gold and Enamel Cased Watch6

London-British Museum-Gold Mounts20

1764 This watch demonstrates Thomas Mudge's exceptional skill. It contains one of the first automatic perpetual calendar mechanisms. The extra day in Leap Years is shown automatically. If the watch is kept going, the date will be correct for 100 years. Thomas Mudge, London Fusee, ruby cylinder escapement, balance with spring (P&E 1977.0702.1)
aperture=f4.5 focal length: 60.0 mm exposure 1/200 sec ISO: 3200

London-British Museum-Gold and Enamel Cased Watch6

London-British Museum-Gold Mounts20
Photo album generated by album from Marginal Hacks by Dave Wed Dec 21 21:19:20 2016