Windmill Gearing: Toothed Wheel on a Vertical Shaft
A geared wheel of 34 teeth turning on an upright axle, with component details
A large toothed wheel set within a circular frame turns on a vertical shaft rising from a splayed base, the driving gear of a windmill. The notes give a transverse yard-beam half a braccio thick, a wheel diameter of 2 braccia measured at the centre of the teeth, and a count of 34 teeth. Separate sketches at lower left show individual shaft-and-collar components of the same mechanism.
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Toothed windmill wheel of 34 teeth
The wheel carried within the circular frame is a gear whose diameter is 2 braccia measured at the centre of the teeth, with 34 teeth in all. It transmits the drive down the vertical shaft to the base below.
Transverse yard-beam and shaft fittings
A transverse yard-beam is specified as half a braccio thick, and the small studies at lower left show the individual shafts and collars of the assembly. These detail the members that carry and locate the geared wheel.