Cut batts to length by setting the top of the batt into the space and cutting against the bottom plate with a sharp utility knife. Leave an extra 1/2 in. of length for a tighter fit. We're using unfaced batts that are sized to friction-fit into standard stud spaces (either 16-in. or 24-in. on-center studs).
History of Windmills. The Persians seem to have been the first to develop windmills (between 500 and 900 A.D.). Sails had long been used to move ships at sea, but the Persians converted the wind for use in grinding grain.
Windmills are machines designed to convert the force of the wind into power to be used by humans. In the Great Plains, windmills were used, and continue to be used, primarily to pump water for consumption by people and domestic animals. Windmill installations typically consist of the actual wind machine and a tower (derrick) to support it in the air. Most windmills used in the Great Plains were of self-governing design. This means that they automatically turned to face changing wind directions and automatically controlled their own speeds of operation to avoid destruction from centrifugal force during high winds.