Minute wheel is a component that results from the assembly of a steel pinion riveted to a brass wheel. This component is located between the mainplate and the dial and is slightly off-center from the central axis of the mainplate.
Minute wheel meshes between the cannon-pinion, which is fixed on the axis of the center wheel, and the hour wheel which is also on the same axis as the pavement.
The minute hand attaches to the cannon-pinion and the hour hand attaches to the hour-wheel. The timing wheel ensures that the difference in rotation between the hour hand and the minute hand is 1/12.