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Nikola Tesla's AC System

        Nikola Tesla was an engineer known for designing the alternating-current(AC)electric system which is still the predominant electrical system used across the World today. He also created the "Tesla coil" which is still used in radio technology.
       
        Tesla designed the alternating-current electrical system which would quickly become the preeminent power system of the 20th century and has remained the worldwide standard ever since. In 1887, Tesla found funding for his new Tesla Electric Company and by the end of the year he had successfully filed several patents for AC-based inventions.
       




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Wilhelm Conrad Roentgen

        Wilhelm Conrad Roentgen was a Nobel-winning German scienist who credited with he discovery of X-rays.         In 1895 while experimenting with electric current flow in a cathode-ray tube, Wilhelm Conrad Roentgen observed that a nearby piece of barium platinocyanide gave off light when the tube was in operation. In view of its uncertain nature, he called the phenomenon X-radiation(also roentgen radiation). He took the first X-ray photographs:interiors of metal objects and of the bones on his wife's hand.
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Galileo Galilei's Telescope

        Galileo Galilei was an Italian astronomer, mathematician, philosopher and professor who made pioneering observations of nature with long-lasting implications for the study of physics. He also constructed a telescope and supported the Copernican theory which supports a sun-centered Solar System. Galileo was accused twice of heresy by the church for his beliefs and wrote a number of boks on his ideas.         In July 1609, Galileo Galilei learned about a simple telescope built by Dutch eyeglass makers and soon developed one of his own. In August, he demonstrated it to some Venetian merchants who saw its value for spotting ships and gave Galileo a salary to manufacture several of them.           Galileo’s ambition pushed him to go further, and in the fall of 1609 he made the fateful decision to turn his telescope toward the heavens. Using his telescope to explore th...
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