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.
The development of the wind turbine continued and by 1900, Denmark alone had about 2500 windmills for various purposes like milling, pumping, and electricity generation with about 30 MW yield. At the time, the largest wind turbines were set up on a 24-meter tall tower with a rotor diameter of 23 meters and had 4 blades.