The crank is also fitted with an arc segment, which engages a matching cutout on
the periphery of the Geneva wheel when the pin is out of the slot. This keeps the Geneva
wheel stationary and in the proper location for the next entry of the pin. The number
of slots determines the number of "stops" of the mechanism, where stop is synonymouswith dwell. A Geneva wheel needs a minimum of three stops to work. The maximum
number of stops is limited only by the size of the wheel.