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Aaliyah W

on 11 June 2013

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Transcript of Pulley

Pulley 1500 BC citation 287 BC- 212 BC 500 AD 800 AD 2000 AD Archimedes of Syracuse invented the first compound pulleys 287 BC - 212 BC. Modern cranes are of varied types and sizes; they may be actuated by steam, electricity, diesel, or hydraulic power as well as by manual power, and they are indispensable in industries where heavy materials are handled constantly. The winch and pulley system made the building of a crane possible. They had the capability to move the rope or cable up and down. The frist know crane was made. They had a winch and pulley system on it and was all made of wood. They made a the crane where someone walked in the inside to role the rope up and rase the object. By having someone walking on the inside they could lift heavy object and if they put someone on each side it would double the lift. Definition a wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines. people in Mesopotamia used rope pulleys for hoisting water. Archimedes of Syracuse invented the first compound pulleys 287 BC - 212 BC. The ancient Egyptian wooden four lobe pinion pulley was used to construct the Giza Pyramids around 2600 BC 2600 BC 1225 AD block and tackle. http://en.wikipedia.org/wiki/pulley http://answers.encyclopedia.com/queston/powers-modern-cranes-128517 http://timerime.com/en/timeline/732863/From+pulley+to+crane/ http://timerime.com/en/timeline?732863/From+pulley+to+crane/ http://timerime.com?en?timeline?732863?From+pulley+to+crane/
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