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The Geneva stop is named after the Geneva cross, a similar
shape to the main part of the mechanism.
The Geneva stop is used to provide intermittent motion,
the orange wheel turns continuously, the dark blue pin
then turns the blue cross quarter of a turn for each revolution
of the drive wheel.
The crescent shaped cut out in dark orange section lets
the points of the cross past, then locks the wheel in
place when it is stationary. (Thanks to Jim McAfee for
pointing this out, we hope Rose likes it!)
The Geneva stop mechanism is used commonly in film projectors
to move the film on one frame at a time.
