WIND AND WINDMILLS

1. WIND AND WINDMILLS

2. WINDMILL THE WINDMILL SPEED DETERMINE THE WIND POWER AND REDUCES

3. windmill is a machine which converts the energy of wind into rotational motion by means of adjustable vanes called sails. The main use is for a grinding mill powered by the wind, reducing a solid or coarse substance into pulp or minute grains, by crushing, grinding, or pressing.[1][2]Windmills have also provided energy to sawmills, paper mills, hammermills, and windpumps for obtaining fresh water from underground or for drainage (especially of land below sea level.

4. TOWER WINDMILL The familiar lattice style of windmill sails (also called "common" sails) allowed the miller to attach sailcloths to the sails (while applying a brake). Trimming the sails allowed the windmill to turn at near the optimal speed in a large range of wind velocities. The fantail, a small windmill mounted at right angles to the main sails which automatically turns the heavy cap and main sails into the wind, was invented by Edmund Leein 1745, in England. The smock mill is a later variation of the tower mill, constructed of timber and originally developed in the sixteenth century for land drainage. With some subsequent development mills became versatile in windy regions for all kind of industry, most notably grain grinding mills, sawmills (late 16th century), threshing, and, by applying scoop wheels, Archimedes screw and piston pumps, pumping water either for land drainage or for water supply. In 1772, Scottish millwright, Andrew Meikldeveloped the spring sail made from a series of connected parallel shutters that could be opened or closed according to windspeed. To do this the sails had to be stopped, but the sails also incorporated a spring which allowed the shutters to open a little more to prevent damage if the wind suddenly strengthens. In

5. Multi- Sailed Windmills The windmills increases the speed of how fast the wind be blowing. • The majority of windmills had four sails. An increase in the number of sails meant that an increase in power could be obtained, at the expense of an increase in the weight of the sail assembly. The earliest record of a multi-sailed mill in the United Kingdom was the five sail Flint Mill, Leeds mentioned in a report by John Smeatonin 1774. Multi-sailed windmills were said to run smoother than four sail windmills. In Lincolnshire more multi-sailed windmills were found than anywhere else in the United Kingdom. There were five, six and eight sail windmills