Geneva stop
noun
A stop consisting of a wheel with radial slots or cogs, as in a Geneva movement, but with one of the slots or cogs missing, so that the wheel stops turning before it makes a complete revolution.
- Geneva stops have been used in clockwork to prevent overwinding and underwinding of the spring..
Origin
Mid 19th century; earliest use found in Robert Willis (1800–1875), engineer and architectural historian.
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