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Chrometron Onyx Mantel Clock
(Impulsed; moving coil; mechanically switched)

Chrometron
 


This Onyx cased mantel clock stands 5 inches high and contains a good quality battery movement, known as a Chrometron, and was manufactured by Gebr. Staiger in what was East Germany in the 1970s. 

The name, in a cartouche on the dial below the 12, is 'Luxuria'.


 

Chrometron


The design of the Chrometron movement is based on the principles of the pivoted detent chronometer found in some high grade pocket watches. 

 

Chrometron

The large balance wheel beats half-seconds and receives impulse in one direction only. 

When the balance rotates anticlockwise, a pin on the balance pushes against a light plastic arm which is fixed to the frame of the impulse coil (on the left in the picture) causing the coil assembly to rotate clockwise. This latter action causes a contact arm, which is pivoted on the coil assembly, to make electrical contact with the pin on the balance. When contact is made, a current passes through the coil, the coil rotates further clockwise up to a fixed stop, and also tensions a spring on the pivot of the contact arm. This spring pressure gives a constant force impulse to the balance through the contact arm. When the impulse spring has imparted its force to the balance, contact is broken and the coil returns to its start position while the balance continues its anticlockwise swing. On the return swing (clockwise) of the balance, the impulse pin touches the plastic arm, but pushes it aside and no electrical contact is made.



 
 
Voltage: 1.5v
Battery type: one LR14/MN1400/C size cell
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Copyright  Text & Pictures - Martin Ridout.   Last updated Jan 2005.