Love it when I find an old windmill. Like this one at Douglas Hart Nature Center. I remember seeing them everywhere when I was but a mere child. Now they are getting hard to find. I wasn't sure what they were used for, but I always thought to pump water. So, to be sure before I posted incorrect information, I pulled up Wiki.
Wiki tells me these are actually called windpumps, but are known as windmills, and were used to pump water. They were used on farms and ranches in the USA, Canada, Southern Africa, and Australia. They have a large number of blades so they turn slowly in low winds and self-regulate in high winds. The farm windpump was invented by Daniel Halladay in 1854. Originally, they had wooden blades. In the late 19th century steel blades and steel towers replaced the wooden construction. At their peak in 1930, an estimated 600,000 units were in use.
The plan was to have name only on the link, but obviously I messsed that up. Will I ever get this linkey thing right? Probably not, but it is an adventure every time I click 'publish'.