Some monitoring devices, such as intrusion alarms, employ acoustic waves at frequencies above the range of human hearing; these are also sometimes classified as wireless. The wireless method of communication uses low-powered radio waves to transmit data between devices.
In Percy Shaw invented the cat's eye. Carlton Magee invented the parking meter. The first one was installed in the USA in In an American called Rolla N. Harger invented the first breathalyzer. It was first used in Indianapolis USA in A Swede named Nils Bohlin developed the three-point seat belt in Meanwhile the hovercraft was invented in Antibiotics were discovered too.
Penicillin was discovered in by Alexander Fleming but it was not widely used till after Meanwhile the iron lung was invented in The electronic hearing aid was invented in In Willem Kolff built the first artificial kidney machine. The first kidney transplant was in In Dr Jonas Salk announced he had vaccine for poliomyelitis.
Meanwhile surgery made great advances. The first heart transplant was performed in The first artificial heart was installed in The first heart and lung transplant was performed in The laser was invented in In it was used in eye surgery for the first time.
Meanwhile the invention of fiber optics in the s made possible the development of endoscopes in the s.
Contraceptive pills became available in Britain in Treatment for infertility also improved in the late 20th century. The first test tube baby was born in In Bleriot flew across the English Channel. In Alcock and Brown became the first people to fly across the Atlantic.
In planes began carrying passengers between London and Paris.
Jet passenger aircraft were introduced in In July the Germans used the first flamethrowers. In the British introduced the tank.
Meanwhile in the Germans introduced the first sub-machine gun, which could be operated by one man. In the Thompson sub-machine gun or Tommy gun was produced.
In jet engines were introduced and planes became still faster.
In a plane flew faster than sound for the first time. During the Second World War tanks continued to play a dominant role despite the development of anti-tank guns. However during World War II there were two new developments. The Germans began using rockets.
On 13 June they launched the first V-1 flying bomb. More dangerous was the V-2 rocket. It had a range of miles. It rose to a height of 50 miles and traveled at over 2, mph.
From the date of the first printing press to the current explosion of the Web, the greatest moments in the history of innovation are chronicled on a vivid time chart. The recent "miracles" of technology were not due to conceptual breathroughts (a smartphone was simply a bad camera plus a bad phone plus a bad computer plus a bad camcorder) but were due to progress in manufacturing techniques, a progress that started when transistors were invented. In the early 20th century vehicle technology advanced rapidly. In Percy Shaw invented the cat's eye. Carlton Magee invented the parking meter. The first one was installed in the USA in In an American called Rolla N. Harger invented the first breathalyzer. It was first used in.
The other development was the atomic bomb. On 6 August one exploded over Hiroshima.In the s, there were hints of things to come in the early 20th century: Karl Benz invented the first car that was powered by an internal combustion engine, and Gottlieb Daimler made the first motorcycle with a gasoline engine.
In the early 20th century vehicle technology advanced rapidly. In Percy Shaw invented the cat's eye. Carlton Magee invented the parking meter. The first one was installed in the USA in In an American called Rolla N. Harger invented the first breathalyzer. It was first used in. Technology, science, inventions and re-inventions have progressed at an accelerated rate during the hundred years of the 20th century, more so than any other century.
We began the 20th century with the infancy of airplanes, automobiles, and radio, when those inventions dazzled us with their novelty and wonder.
The 20th century Technology from to Recent history is notoriously difficult to write, because of the mass of material and the problem of distinguishing the significant from the insignificant among events that have virtually the power of contemporary experience.
While all the starts and stops of the electric vehicle industry in the second half of the 20th century helped show the world the promise of the technology, the true revival of the electric vehicle didn’t happen until around the start of the 21st century.
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.