When Nikola Tesla was a little boy of about five years old growing up in what is now the Republic of Croatia, he would go to a small stream near his home in Smiljan and test a small water wheel he had built. The wheel was a disk that someone had cut from the trunk of a tree. Nicola made a hole in the middle of the disk and inserted a thin branch through it. The ends of the branch rested on thorn sticks standing on both sides of the stream. I liked to watch the wheel rotate with the force of the current. He noticed later that the other water wheels contain paddle or blades, but the wheel he made does not contain paddles or blades and still rotates smoothly, the memory of the water wheel that he made may have inspired later the innovation of the blade less turbine, as the "Tesla turbine" is known.
And when he was ten years old, he saw steel inscriptions for Niagara Falls and imagined a large water wheel rotating by the strong water current. He said to his father, "One day I will go to America and harness Niagara Falls to produce energy." It can not be understood.
Nikola Tesla
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