Bob:
There's no spring at all except for the hair spring on the
balance wheel. I've taken apart both later 53 style and earlier
51 style. Both use a magnet and a contact on the balance wheel.
The balance wheel is brass with a Y shaped iron armature. On the
balance wheel is a contact pin which contacts a pivot completing
the power to the small bobin. This gives tha balace wheel a
small "kick" every osciallation. Attached is a photo of the
clock. The pencil points to the contact. The ends of the Y
armature can be seen. Above the pencil Just below the round bar
can be seen the magnets field lamanations of three layers.
Blake
<<<snip>>>electrically-wound clock.
As the clock unwound its mainspring, electric contacts met and
the device
ratcheted to wind the spring again.
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