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invention of raido and television transmissions
Before 1920, radio transmission consisted a series of dots and dashes, transmitted by inefficient machines. The credit for inventing the present-day radio/television transmission, goes to Ernst Alexanderson, a Swedish-American engineer. After rigorous experimentation and hard work, he invented a high-frequency alternator for the first time, with which transmission of radio waves became successful. A few years later, he developed a scanning disk and high-frequency neon lamps for television transm -
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inventions
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invention of the band aid
Earle Dickson made band aid for the first time for his wife, Josephine Dickson. Earle Dickson worked in the company Johnson & Johnson that manufactured gauze and tape. He used a piece of tape with a small-sized gauze in the middle, and put it on Josephine's injured hand. Later, he started selling these strips and after four years, Johnson & Johnson produced it on a commercial scale and called it 'Band-Aid' -
invetion of the hair dryer
Prior to the 1920s, women used to blow-dry their hair by inserting a flexible pipe in the exhaust of a vacuum cleaner. In 1920, the first hair dryer was invented. Though the machine was not efficient enough and got overheated easily, it was, of course, better than using a vacuum cleaner -
invention of the traffic light
William Potts, a police officer from Detroit Michigan, invented traffic lights. He made his invention by using red, green and amber lights, and wire. The traffic lights were installed for the first time in the region of Woodward and Michigan Avenues in Detroit, United States. -
invention of the lie detector
Lie detector or polygraph was invented by John A. Larson, a medical student in California. In the lie detector test, the device measured the heartbeats and breathing rate of a person in order to check whether the person was lying or not. If the pulse rate and breathing were high, then an alarm would buzz, indicating that the person was lying -
invention of the rocket
The first liquid-fueled rocket was launched by Robert Hutchings Goddard of the United States. During the first World War, he developed solid-fuel rockets for use in armed weapons. His pioneering work in the field was evident from the fact that he possessed 214 patents in rocketry -
invention of penicillin
Penicillin, one of the widely used antibiotics, was invented by scientist Sir Alexander Fleming after studying bacteria. Since penicillin was not approved by the FDA, it was not popular in those times. Subsequent researches had been done about the effects of penicillin on various strains of bacteria. It was only after the World War I that people started using penicillin as a life-saving drug -
invention of frozen foods
Clarence Birdseye, a naturalist from the United States, invented frozen food. In New York, he started a packing company called Birdseye Seafoods, Inc., in 1924. He introduced a system wherein dressed meat and vegetables were preserved in waxed-cardboard cartons, after being exposed to high pressure. In 1930, he succeeded in patenting the Birdseye system of freezing food -
invention of the first jet engine
Dr. Hans von Ohain and Sir Frank Whittle are both recognized as being the co-inventors of the jet engine. Each worked separately and knew nothing of the other's work. Hans von Ohain is considered the designer of the first operational turbojet engine. Frank Whittle was the first to register a patent for the turbojet engine in 1930. Hans von Ohain was granted a patent for his turbojet engine in 1936. However, Hans von Ohain's jet was the first to fly in 1939. Frank Whittle's jet first flew in in 1 -
The first synthetic rubber is invented
Synthetic rubber is any type of artificial elastomer, invariably a polymer. An elastomer is a material with the mechanical (or material) property that it can undergo much more elastic deformation under stress than most materials and still return to its previous size without permanent deformation. Synthetic rubber serves as a substitute for natural rubber in many cases, especially when improved material properties are required -
FM radio broadcasting is born
FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation (FM) to provide high-fidelity sound over broadcast radio. The term "FM band" describes the "frequency band in which FM is used for broadcasting". This term is slightly misleading, since it equates a modulation method with a range of frequencies
