Smith mystery clock made by Smith's Electronic Clocks
C1934.Synchronous motor 220 volts A.C 50 Cycle mains powered
Unusual
Smiths Electric Mystery Clock. C1934 The
clockwork for this clock is housed in
the small chromium plated drum in the
centre of the dial. Inside this small
drum is the motion work for the hands
and a ratchet mechanism. The clock has
three glass plates. One is the dial with
the numerals on the inside. Another is
the back which has the hands adjuster
fixed to the centre. The third piece of
glass is inside between the two other
glasses. This inside glass is attached
to the central barrel and is rocked
slightly from side to side by an
electric motor in the base of the clock.
This rocking motion is enough to operate
the ratchet mechanism which then turns
the hands. As the glass cannot be seen
moving, to observers the way the hands
move is a ‘Mystery’.
Two Mystery clocks recently restored for customers
The movement on this clock was very worn and noisy in
operation, it had other problems too!
This is the hand setting knob, you will find a pin running through
it which needs removing before the clock can be dismantled
When these two nuts are removed the glass can then be removed
When the repairs are completed the glass is polished, take care
every finger mark left will show!!
picture showing the sixty tooth ratchet wheel in the centre
housing
The finished motion work ready to fit the hands
Amount of wear found on the motor arbour
Pivots and gears all needing some attention
Badly worn pivot hole will need re-bushing
This pinion too will need polishing
Worn gears can be a problem
Picture of the centre shaped glass this moves slowly
right and left powered by the Synchronous mains motor It takes one minute to do this- moving one tooth on the
ratchet wheel- which advances the minute hand by one minute
Some repair was needed to the frame of the clock
This holds the clock together and through over-tightening
in the past, had come detached!!
Here the movement is finished and ready
for the case
Top view of finished movement
The finished clock
You can see right through the clock dial! the mystery is--
what drives the hands?
This clock stands
8inches high with the clock itself measuring 6.25inches square. It
operates from the mains at 250volts 50hertz.