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Period: to
1920-1940
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Iconoscope (cathode-ray tube)
The inventor, Vladimir Kosma Zworykin, was born on July 30, 1889 and died July 29, 1982. He was known as the father of television. After his education, served in World War 1 in the Russian Signal Corps. He emigrated to the United States in 1919, and became a naturalized citizen in 1924, a year after his invention became patened. -
Traffic Signal
Created by a Kentucky native, Garrett Morgan in 1923. He was the son of former slaves, born in Paris, Kentucky, on March 4,1887.The Morgan traffic signal light is T-shaped, that has three positions: Stop, go, and an all direction stop position. The third position halted traffic in all directions so pedestrians can cross the steet safely. He died on August 27,1963. -
Liquid Fueled Rockets
Robert Goddard was one of the three most prominent pioneers of rocketry and spaceflight theory. He earned his Ph.D. in physics at Clark University in 1911 and went on to become head of the Clark physics department and director of its physical laboratories.
He began to work seriously on rocket development in 1909 and is credited with launching the world's first liquid-propellant rocket in 1926. On March 16, 1926, Goddard successfully tested the first liquid fuel rocket, at Auburn Massachusetts. -
Electronic Television
Philo Taylor Farnsworth (August 19, 1906 – March 11, 1971) was an American inventor and television pioneer. He made many contributions that were crucial to the early development of all-electronic television. He is perhaps best known for inventing the first fully functional all-electronic image pickup device (video camera tube), the "image dissector", as well as the first fully functional and complete all-electronic television system. -
Car Radio
The commercial introduction of the fitted car radio came in the 1930s from the Galvin Manufacturing Corporation. Galvin Manufacturing was owned and operated by Paul V. Galvin and his brother Joseph E. Galvin. The Galvin brothers purchased a battery eliminator business in 1928 and the corporation's first product was a battery eliminator that allowed vacuum tube battery-powered radios to run on standard . -
Radar
The radar was invented by Robert Watson-Watt in 1935. It helped out significally in World War 2. It helped locate enemies aircraft, and eventually led to helping with the weather. The radar is used every day by meterologists. The radar was initially nameless. -
Photocopier
Chester Carlson, the inventor of photocopying, was originally a patent attorney, as well as a part-time researcher and inventor. His job at the patent office in New York required him to make a large number of copies of important papers. Carlson, who was arthritic, found this to be a painful and tedious process. This motivated him to conduct experiments with photoconductivity. Carlson used his kitchen for his "electrophotography" experiments, and, in 1938, he applied for a patent for the process. -
Electron microscope
The first electromagnetic lens was developed in 1926 by Hans Busch.
According to Dennis Gabor, the physicist Leó Szilárd tried in 1928 to convince Busch to build an electron microscope, for which he had filed a patent.
The German physicist Ernst Ruska and the electrical engineer Max Knoll constructed the prototype electron microscope in 1931, capable of four-hundred-power magnification; the apparatus was the first demonstration of the principles of electron microscopy.
