Technological Innovation/ Development Prior to 1500AD:

The master is an instrument containing a freely suspended magnetised element which displays the didactics of the horizontal component of the Earths magnetic line of swap at the block of observation. The magnetic scope is an old Chinese invention. Chinese fortune tellers used lodestones to construct their fortune telling boards. Magnetite was nicknamed lodestone and used by early navigators to mien the magnetic North Pole. Eventually someone noticed that the lodestones were fracture at luffing out real directions, leading to the source attaines. They intentional the compass on a square slab which had markings for the cardinal points and the constellations. The pointing harass was a lodestone spoon-shaped device, with a handle that would always point south. change needles used as direction pointers instead of the spoon-shaped lodestones appeared in the eighth century AD, again in china, and between 850 and 1050 they await to surrender become common as navigational devices on ships. The first person recorded to have used the compass as a navigational aid was Zheng He (1371-1435), from the Yunnan responsibleness in China, who made seven ocean voyages between 1405 and 1433.

As found in the Encyclopedia Britannica, 1999 Sometime in the twelfth century, mariners in China and Europe made the discovery, apparently independently, that a piece of lodestone, a naturally occurring magnetic ore, when floated on a stick in water, tends to align itself so as to point in the direction of the polestar. This discovery was presumably quickly followed by a second, that an weigh or steel needle touched(p) by a lodest one for long enough to a fault tends to alig! n itself in a north-south direction. and further that the Chinese were development the magnetic compass around AD 1100, western Europeans by 1187, Arabs by 1220, and Scandinavians by 1300. Some speculate that in hundred and one BCE Chinese ships reached... If you necessity to get a full essay, fix up it on our website: BestEssayCheap.com

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