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  2. Franklin's electrostatic machine - Wikipedia

    en.wikipedia.org/wiki/Franklin's_electrostatic...

    Franklin called this device an "electrical battery", [4] but that term later came to have a different meaning, referring instead to a set of one or more galvanic cells. At that time, the word "battery" was a military term for a group of cannons. [32] Franklin was the first to apply the terms "positive" and "negative" to electricity.

  3. Lester Allan Pelton - Wikipedia

    en.wikipedia.org/wiki/Lester_Allan_Pelton

    Pelton was watching a spinning water turbine when the key holding its wheel onto its shaft slipped, causing it to become misaligned. Instead of the jet hitting the cups in their middle, the slippage made it hit near the edge; rather than the water flow being stopped, it was now deflected into a half-circle, coming out again with reversed direction.

  4. Levitron - Wikipedia

    en.wikipedia.org/wiki/Levitron

    The Levitron top device is a commercial toy under this brand that displays the phenomenon known as spin-stabilized magnetic levitation. This method, with moving permanent magnets, is quite distinct from other versions which use changing electromagnetic fields, levitating various items such as a rotating world globe, model space shuttle or VW ...

  5. Kelvin water dropper - Wikipedia

    en.wikipedia.org/wiki/Kelvin_water_dropper

    The Kelvin water dropper, invented by Scottish scientist William Thomson (Lord Kelvin) in 1867, [1] is a type of electrostatic generator. Kelvin referred to the device as his water-dropping condenser. The apparatus is variously called the Kelvin hydroelectric generator, the Kelvin electrostatic generator, or Lord Kelvin's thunderstorm.

  6. Entertech - Wikipedia

    en.wikipedia.org/wiki/Entertech

    Entertech was a brand of battery-powered motorized water guns sold in the United States from 1985 to 1990 by the now-defunct LJN. [ 1 ] [ 2 ] [ 3 ] Unlike the colorful designs of many of the simple hand powered pump water guns of that time, most of the Entertech water guns were manufactured from black plastics with a matte finish to resemble ...

  7. History of perpetual motion machines - Wikipedia

    en.wikipedia.org/wiki/History_of_perpetual...

    An engraving of Robert Fludd's 1618 "water screw" perpetual motion machine. The history of perpetual motion machines dates at least back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but modern theories of thermodynamics have shown that they are impossible. Despite this, many attempts ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Water turbine - Wikipedia

    en.wikipedia.org/wiki/Water_turbine

    The main difference between early water turbines and water wheels is a swirl component of the water which passes energy to a spinning rotor. This additional component of motion allowed the turbine to be smaller than a water wheel of the same power. They could process more water by spinning faster and could harness much greater heads.

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