1800-1850 This cleverly constructed device turns an ordinary pocket watch into an alarm clock. The bell is released when the falling weight reaches the spring. (P&E CAI-2200)
aperture=f4.5 focal length: 60.0 mm exposure 1/200 sec ISO: 3200
travel : LondonRome2012 : Organized : Museums : BritishMuseum : London-British Museum-Desktop Alarm Mechanism41 |
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