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Gilbert was first interested in chemistry but later changed his focus due to the large portion of mysticism of
alchemy involved (such as the transmutation of metal). He gradually developed his interest in physics after
the great minds of the ancient, particularly about the knowledge the ancient
Greeks had about lodestones,
strange minerals with the power to attract iron. In the meantime, Britain became a major seafaring nation in
1588 when the Spanish Armada was defeated, opening the way to British settlement of America. British
ships depended
on the magnetic compass, yet no one understood why it worked. Did the Pole Star attract it,
as Columbus once speculated; or was there a magnetic mountain at the pole, as described in Odyssey, which
ships
would never approach, because the sailors thought its pull would yank out all their iron nails and
fittings? For nearly 20 years, William Gilbert conducted ingenious experiments to understand magnetism.
His works include On the Magnet, Magnetic Bodies, and the Great Magnet of the Earth.
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Gilbert’s discovery was so important to modern physics. He investigated the nature of magnetism and
electricity. He even coined the word “electric”. Though the early beliefs of magnetism were also largely
entangled with superstitions such as that rubbing garlic on lodestone can neutralise its magnetism, one
example being that sailors even believed the smell of garlic would even interfere
with the action of compass,
which is why helmsmen were forbidden to eat it near a ship’s compass. Gilbert also found that metals can be
magnetised by rubbing materials such as fur, plastic or the like on them. He named the ends of a magnet
“north pole” and “south pole”. The magnetic poles can attract or repel, depending on polarity. In
addition,
however, ordinary iron is always attracted to a magnet. Though he started to study the relationship between
magnetism and electricity, sadly he didn’t complete it. His research of static electricity using amber and jet
only demonstrated that objects with electrical charges can work like magnets attracting small pieces of paper
and stuff. It is a French guy named du Fay that discovered that there are actually two
electrical charges,
positive and negative.
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