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Wheatley Windmill Glossary of Mill Terms

Bed Stone: This is the lower one of a pair of Mill Stones and is fixed in position.
Boulter: This is a machine used to refine the milled flour. It uses a rotating drum powered by the mill to separate the flour from the bran.
Brake: A brake is fitted to the Brake Wheel so that the sails can be stopped from turning.
Brake Wheel: This is a large cogged wheel fitted to the Windshaft, it is situated in the Cap of the Mill. It meshes with the Wallower and so converts the almost horizontal rotation of the sails to the vertical rotation needed to distribute the power throughout the mill. The braking mechanism is fitted to this wheel.
Cap: The top part of a tower mill. The cap which rotates to face the wind holds the Windshaft and Brake Wheel and it's the part to which the sails are attached.
Clasp Arm: A frame that holds the Wallower in place.
Main Shaft: This is a large shaft made from wood set vertically down the center of the mill. It is powered from the Wallower and rotates to provide power to the rest of the mill.
Mill Stones: These are large circular stones that have groves cut into the surface. They are used in pairs one of which rotates above the other, grain is then fed in between them and is crushed releasing the flour.
Runner Stone: This is the upper one of a pair of Mill Stones and is the only one that turns.
Shear: These large wooden beams lie horizontally forming the base of the cap.
Spur Wheel: This is a large cogged wheel attached at the bottom of the Windshaft. It is used to power the Mill Stones.
Stone Nut: This is a small cogged wheel that meshes with the Spur Wheel and powers the Mill Stones. There is one Stone Nut per sets of Mill Stones.
Trolley Wheels: These wheels are fitted at the base of the cap allowing the cap to be turned.
Wallower: This is a large cogged wheel attached at the top of the Windshaft. It is used to convert the horizontal rotational power from the sails to vertical rotational power for the Mill Stones.
Windshaft: This is a large shaft made from wood set almost horizontally at the top of the mill. It is how the sails are connected to the mill and rotates as they do transmitting the power inside the mill.

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