When was magnets first invented

Roughly 4, years ago, a Greek shepherd named Magnes is said to have been tending his sheep in a region of northern Greece called Magnesia. He took a step and suddenly found that the nails that held his shoe together and the metal tip of his staff were stuck fast to the rock he was standing on! Intrigued, he began digging and discovered the first recorded lodestone. In the early A. Pliny attributed the powers of magnetite to magic, launching years of superstitious theories about the material, including the possibility that ships that had disappeared at sea had actually been attracted to magnetic islands.

On an unrelated but interesting note, Pliny died in the eruption of Pompeii. With a large lodestone deposit in Scandinavia and not enough light to navigate ships by in the winter, the Vikings had plenty of incentive to put the magnetic properties of lodestone to practical use. As early as 1, B. History tells us that Viking sailors utilized a magnetized iron needle placed into a piece of straw—and floated in a bowl of water—to indicate north and south. The Chinese navigated using a splinter of lodestone floated on water as early as A.

Explorers like Marco Polo brought the magnetic compass back to Italy, finally enabling the Europeans to explore the oceans that the Vikings had already been navigating using their own version of the compass for at least years. The first useful invention using magnet was the compass. The Chinese noticed that when making a needle from the magnet and placing it on top of some water, the needle always point to north. So the Chinese made the military compass about B. At about the same time or afterwards the Vikings also invented the compass and used it to invade England using the fog to cover them.

But Europe knew about the compass during the trips done by the Italian to Chinese. The artificial magnet was first invented in the year William Gilbert an English physician who proved that the earth is a big magnet, and he was the first to make artificial magnet. Samarium Cobalt magnets are made from Samarium, Cobalt, and Iron, with the majority of the material being Iron. They are typically used in higher temperature applications where the strength of rare earth magnets is still needed.

They have a higher Curie temperature than does Neodymium but are also costlier to manufacture. When a manufacturer suspects that a drilling operation could cause plugs inside a precision brake component, he knows that the resulting damage will be more costly and require greater action than a simple phone call. Like any maintenance supervisor at a busy stamping plant, year manufacturing veteran Mike De Vitt's goal at Radar Industries in Warren, Michigan, is to keep his presses up and running.

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