Download Great Inventions of the 20th Century (Scientific American) by Peter Jedicke PDF

By Peter Jedicke

From the 1st V-8 engine to NASA's gigantic crawler at Cape Canaveral, this paintings provides a party of the inventors and innovations that reworked the area through the age of expertise. It acquaints younger readers with the tale and the mechanics in the back of every one gadget.

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52 Great Inventions of the 20th Century By analyzing the data from an MRI scan, doctors can generate a side view of a person’s head and see a picture of the brain inside. MRI In addition to X-rays and ultrasound, scientists have developed an imaging technique based on magnetism. It is called MRI, which stands for magnetic resonance imaging. MRI is a complicated and expensive process. One advantage is that it doesn’t send any hazardous radiation into the body. Instead, a powerful electric magnet is lined up with the part of the body that the doctors want to look at.

When the fuel burns, it expands with tremendous power. Because the jet engine is built so that the expanded fuel mixture can only exit out the back, there is a very powerful forward thrust. The exhaust is going extremely fast, which is why jet aircraft are capable of such incredible speed. Propeller-driven airplanes can’t compete because a propeller doesn’t push air backward as fast as a jet engine can. Swept-Back Wings The most obvious feature of an airplane is its wings. For the first few decades of flight, wings were designed to extend straight out from the body of the airplane at a 90-degree angle.

You probably have a dozen of them in your own home. ELECTRIC GENIUS The method that is still used today to transmit electrical power over transmission wires, called “three-phase alternating current,” was devised by Nikola Tesla. As an inventor in the late nineteenth century, Tesla was almost as famous as Thomas Edison. But while Edison turned his inventions into a successful business,Tesla became more and more eccentric over the years. He experimented with wireless signals and shared some of the credit for inventing radio with Guglielmo Marconi.

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