The Hour Wheel

Reference no 250


  The hour hand is attached to the Hour Wheel (250) arbor. The Minute Wheel pinion drives the wheel called the Hour Wheel (250), which in turn decelerates the turning rate of the center wheel to the Hour Wheel by a factor of 1:12, giving the Hour Wheel the turning rate of one revolution in 12 hours.



  In the figure above it can be seen how the Minute Wheel pinion drives the Hour Wheel. The Hour Wheel is centered by the Cannon Pinion but not fixed to it, see center of the figure. In this way the Cannon Pinion and the hour Wheel can rotate around the same center axis but at different speeds.