Although Jack Windmill is now devoid of machinery, evidence of such remains today.

The "beehive" cap, constructed of lapped ash, rotated on a circular curb and brought the Sweeps into wind by means of a Fan.

The five floors, from top to bottom, are the Gear floor, Bin floor, Stone floor, Spout floor and Ground floor, from which an underground passage leads to the Granary.

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