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- M. B. Pray Cylinder Escapement - The escape
- wheel is all in one plane. At A the escape
- wheel tooth is just entering the cylinder
- giving a clockwise impulse to balance. At
- B the impulse is finished and the tooth
- point rides on the inside of the cylinder
- and a slight counter-clockwise impulse is
- given. At D the tooth has escaped and a
- succeeding tooth will fall on, and ride
- on, the outside of the cylinder.