Friday, November 25, 2016

ELECTROMAGNETIC CLOCK: Kundo (Germany) clock

A vintage Germany clock from manufacturer Kundo, around 1960's.




This particular and clever kind of clock keep time as mechanical watches do, with a swinging pendulum. But there is no mechanical winding: instead a magnetic force applied by the solenoid inside brass cylinder to the pendulum arm, gives to the pendulum a momentum maintaining pulses during time.







The solenoid is mechanically activated by a micro switch linked to the pendulum on the upper side.

Accuracy is provided by the brass bell, which is screwed on the pendulum. Each turn right raise the bell on the pendulum linkage, keeping the period shorter. On the other side, each turn left lower the bell, keeping the period longer.






I've replaced original battery (visible in the photo) with two AA size 1.5V batteries, and i've never replaced them in 4 years now.


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