This photo shows the wallower, the brake wheel and brake lever of the Prairie Mill.  This assembly is in the cap at the top of the mill.

The brake wheel transfers wind energy to the wallower and main spindle, which provides the force to turn the millstones.  The cogs on each wheel are made of hard maple.

There are x cogs on the wallower and y cogs on the brake wheel.  There are uneven proportion of cogs on the brake wheel (three times +1) to keep all cogs wearing evenly.

The brake lever used to operate the Flemish Brake is also visible in this picture.

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