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Early designs of perpetual motion machines were done by Indian mathematician–astronomer Bhaskara II, who described a wheel (Bhāskara's wheel) that he claimed would run forever. [2] A drawing of a perpetual motion machine appeared in the sketchbook of Villard de Honnecourt, a 13th-century French master mason and architect.
The wheel consisted of curved or tilted spokes partially filled with mercury. [1] Once in motion, the mercury would flow from one side of the spoke to another, thus forcing the wheel to continue motion, in constant dynamic equilibrium. Like all perpetual-motion machines, Bhaskara's wheel is a long-discredited mechanism.
Perpetual motion wheels from a drawing by Leonardo da Vinci. Another theoretical machine involves a frictionless environment for motion. This involves the use of diamagnetic or electromagnetic levitation to float an object. This is done in a vacuum to eliminate air friction and friction from an axle. The levitated object is then free to rotate ...
The Charon zoetrope is built to resemble and rotate in the same kinetic fashion as a ferris wheel, stands at 32 feet high, weighs 8 tons and features twenty rowing skeleton figures [40] representing the mythological character, Charon, who carries souls of the newly deceased across the river Styx.
The spinning wheel spread from the Middle-East to Europe by the 13th century, with the earliest European illustration dated to around 1280. In France, the spindle and distaff were not displaced until the mid 18th century. [15] [16] The spinning wheel replaced the earlier method of hand spinning with a spindle. The first stage in mechanizing the ...
A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder), the electrical polarity depending on the direction of rotation and ...
Spinning in the grease covers the spinner's hands in lanolin and, thus, softens the spinner's hands. Spinning in the grease works best if the fleece is newly sheared. After several months, the lanolin becomes sticky, which makes the wool harder to spin using the short-draw technique, and almost impossible to spin using the long-draw technique.
A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder) with an electrical polarity that depends on the direction of ...
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