Windmill Detail: Cap Resting on the Wheel
The turning roof seated on its bearing wheel, with the drive gearing
A close study of the windmill's rotating cap shows how the roof is seated on a ring or wheel that lets it turn, together with the associated gearing and a small squared inset at upper right. The note states that the roof rests upon the wheel. A lower sketch shows a shaft ending in a splayed fitting.
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Rotating cap seated on a bearing wheel
The roof is set on a horizontal ring or wheel so that the whole cap can be turned to the wind, as the note confirms. The surrounding lines show the gearing and framing that carry it.