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Science Source ftp Apr 2015

EN_01170126_0293
Science Source ftp Apr 2015
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The 2nd century AD author Lucian wrote that during the Siege of Syracuse Archimedes destroyed enemy ships with fire. The device, sometimes called the "Archimedes heat ray", was used to focus sunlight onto approaching ships, causing them to catch fire. This weapon has been the subject of ongoing debate about its credibility since the Renaissance. It has been suggested that a large array of highly polished bronze or copper shields acting as mirrors could have been employed to focus sunlight onto a ship. This would have used the principle of the parabolic reflector in a manner similar to a solar furnace. Archimedes of Syracuse (287-212 BC) was a Greek mathematician, physicist, engineer, inventor, and astronomer. Few details of his life are known, but he is regarded as one of the leading scientists in classical antiquity. Among his advances in physics are the foundations of hydrostatics, statics and an explanation of the principle of the lever. He is credited with designing innovative machines, including siege engines and the screw pump that bears his name. Archimedes is considered to be the greatest mathematician of antiquity and one of the greatest of all time. He used the method of exhaustion (method of finding the area of a shape by inscribing inside it a sequence of polygons whose areas converge to the area of the containing shape) to calculate the area under the arc of a parabola with the summation of an infinite series, gave an accurate approximation of pi and defined the formulae for the volumes of surfaces of revolution and an ingenious system for expressing very large numbers. Archimedes died during the Siege of Syracuse when he was killed by a Roman soldier despite orders that he should not be harmed.
2015-04-07
East News
Science Source
Science Source
BU9959
2,29MB
36cm x 27cm przy 300dpi
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