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Coromatic Ticket Alarm Clock
(Impulsed; moving magnet; electronically switched)


Coromatic Ticket Alarm Clock

This alarm clock was made in Japan, probably in the late 1960s or early 1970s.

The clock is powered by a single 1.5 volt battery, and has a 24 hour display formed by tickets that flip over each minute as the drum on which they are mounted rotates. 
Coromatic Ticket Alarm Clock
Coromatic Ticket Alarm Clock

The alarm is set by the large wheel, and is sounded on the oval bell at the back of the movement being struck by a rotating hammer on the shaft of a small electric motor.


The movement is governed by a moving magnet balance wheel which is electronically switched by one transistor. 

The electronics (one transistor, one resistor and two capacitors)  are on a single board along with the coil assembly. The hands are driven by an inverted Sully escapement.


Coromatic Ticket Alarm Clock
Voltage: 1.5v
Battery type: one LR20/MN1300/D size cell
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Copyright  Text & Pictures - Martin Ridout.   Last updated Jan 2005.