Next time you drive through rural USA, spend some time on the backroads, & drive past a couple of abandoned farm houses. (They are numerous as the family farms have been driven out of busines--but that's a different thread.) If you stop & look around, you may see a tumbling down barn & out buildings, & an old frame house abandoned many years ago, but if you listen, you may notice an eerie creaking sound. Look upward, & you may see the motion of a decades old open back geared steel pumping windmill on a steel tower near the old house. The windmill is still turning.