Although magnets were not invented, they were discovered by either the ancient Greeks or the Chinese. According to a legend, a Greek shepherd accidentally discovered lodestones in an area called Magnesia. Lodestone contains magnetite, which is a mineral found in nature as an iron ore.
However, the ancient Chinese also were familiar with lodestone and its magnetic properties. Nearly 4,500 years ago, they used lodestones in divining devices and mariner compasses. For these ancient people, lodestone magnetism was a natural phenomenon that was not understood.
It was not until the 1600s that magnetism began to be studied and understood by men like Peregrinus and William Gilbert. In 1820, Hans Oersted showed that there was a relationship between electricity and magnetism. Another important person that worked on magnetism and its relationship with electricity was James Clark Maxwell.Learn More
The fire extinguisher was invented by George William Manby in 1818. It was a simple device that used a copper cylinder and compressed air to push large amounts of water through the nozzle of the cylinder.Full Answer >
Catapults were long-range weapons designed to help destroy castles in the Middle Ages. They typically consisted of a throwing arm armed with a basket to hold the desired projectile, which would then launch the projectile.Full Answer >
It is not definite as to who invented dominoes, but it is likely that dominoes were invented in China during the 12th century. However, it is possible that they were first invented in Egypt, as there is a set of dominoes that was found in King Tutankhamen's tomb.Full Answer >
Dr. Ian Donald invented the first ultrasound machine in 1957 and tested it on patients a year later. The discovery was made in Glasgow, Scotland, and by the end of the 1950s ultrasounds became routine in Glasgow hospitals.Full Answer >