The Minute Wheel

Reference no 260


  The Cannon Pinion drives a wheel called the Minute Wheel (260), 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.

Here the Minute Wheel can be seen to the right of the Cannon Pinion. The Minute Wheel not only acts to drive the Hour Wheel but also is driven by the Setting Wheel.



  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.