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Inventions Around the World, He noticed the mould seemed to be preventing…
Inventions Around the World
Compass
People in ancient China discovered that if a lodestone was suspended so it could turn freely, it would always point toward the magnetic poles.
The magnetic compass was first invented as a device for divination as early as the Chinese Han dynasty and Tang dynasty (since about 206 BC).
made with lodestone, a form of the mineral magnetite that is a naturally occurring magnet and aligns itself with the Earth's magnetic field
The compass was used in Song dynasty China by the military for navigational orienteering by 1040–44, and was used for maritime navigation by 1111 to 1117.
Penicillin
In 1928 Dr Alexander Fleming returned from a holiday to find mould growing on a Petri dish of Staphylococcus bacteria.
He soon identified that the mould produced a self-defence chemical that could kill bacteria.
Printing Press
In the mid-1400s a German craftsman named Johannes Gutenberg developed a way to handle this process by machine— the first printing press.
His invention combined movable pieces of metal type that could be reused with a press that could produce sharp impressions on paper over and over again.
Woodblock printing in China dates back to the 9th century and Korean bookmakers were printing with moveable metal type a century before Gutenberg.
From his childhood Gutenberg had seen wine and olive presses.
Drawing on this knowledge Gutenberg adapted existing technology to design his innovation.
Subsequently he learnt the art of polishing stones became a master goldsmith and also acquired the expertise to create lead moulds used for making trinkets.
Wheel
:
They were invented in Mesopotamia about 5,500 years ago.
The earliest wheels were used as potter's wheels.
The wheel was invented in the 4th millennium BC in Lower Mesopotamia(modern-day Iraq).
It was only in 2000 BC that the discs began to be hollowed out to make a lighter wheel.
The wheelbarrow—a simple cart with a single wheel—was invented by the ancient Greeks.
The Sumerian people inserted rotating axles into solid discs of wood.
He noticed the mould seemed to be preventing the bacteria around it from growing.
