Journal # 9
This journal is mostly related to wind power.Wind is a natural source of energy.Scientists believe that oil will be finished in the near future. they have to find an other way to substitue for this liquid to produce energy. To use energy from natural sources is related to thousands years ago.
Iran started to research to use wind energy in seventh sentury. there is a wind mill power in North West of Iran which shows the history of using wind energy to evacuate water fron under the ground. wind impacts the blade of mill and propeller rotates aroun its axis. the rotating movement changes to linear mvement, it causes to move a piston inside of the cylider and warer is evacuated by this mechanism from the deep point of thr ground.
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