Loading 3D model
You are seeing a 360° image instead.
Connection error. Please try again.
Sorry, the model can't be displayed.
Please check out our FAQ to learn how to fix this issue.
It looks like your browser or this site is blocking some scripts or cookies necessary to properly display the viewer.
Or visit the Help Center for more information:
Cubitt Patent Sails 3D Model
Diagrammatic model by Cliff Featherston.
The sails of a windmill need to rotate at a constant pace, so the angle of the shutter blades that catch the wind must be constantly adjusted to suit the wind’s speed.
In 1807 Sir William Cubitt invented a mechanism that allows the shutters to be adjusted whilst the sails are still rotating. In this model the wind shaft has been cut away to show how a rod passing through its centre transfers the movement of the adjustment mechanism at the rear of the cap to the shutter control linkage mounted on the sails.