Movement 71
AnimatedOriginal 

71. The inner circumference (shown by dotted lines) of the rim of the driving-wheel, B, serves as a lock against which two of the studs in the wheel, C, rest until the tappet, A, striking one of the studs, the next one below passes out from the guard-rim through the lower notch, and another stud enters the rim through the upper notch.

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