Windmills are an important sight on the Limburg landscape and a source of education for people of the local community. In general, all windmills also foster a sense of Dutch heritage and identity, as they helped pump out water from the Dutch polders, drive the expansion of the wooden constructed ships and secured the availbility of grains.
As the wind picks up, the teeth of the driving gear engage the clogs of the secondary wheel, which is mounted on a vertical axe, turning the grinding wheel.
And the picture below shows some subtle function built in it. As seen, there is a gap between the vertical and horizontal wheels. Furthermore there are no geared profiles, meaning there is an intentional 'slip' between the two, even with the vertical wheel fully in contact with the horizontal one. Reason: there is a second wheel at the rear (blurred because of the shallow dof) which is coupled to the front gear. There is a rope drum over, which hoists and lowers heavy loads, for example filled sacks of ground feed. When the windmill is powered and the main horizontal wheel is rotating at a high speed, if a miller wishes to lower or hoist some weight, all he has to do is gently pull a rope to lower the first vertical wheel on the horizontal one. The slip allows the vertical wheel (and therefore the rope) to gradually pick up speed, rather give a sudden jerk which could break off teeth of the gears... or the miller's!
|camera||Canon EOS 7D Mark II|
|exposure mode||aperture priority|