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What
happened during these years?
First Radio Broadcasting Station - 1922
Commercial
Electric Service Begins - 1922
General Electric's Utica Gas and Electric Company plant in
Utica, New York, was the fist to start sending energy to customers.
Insulin
First used on Humans - 1922
The first insulin injection was given to a human diabetes patient
in
Toronto Canada.
Traffic
Signal - 1923
Garret A. Morgan
Television - 1923-26
John Logie Baird applied for a patent for a mechanical television
in 1923. He ran successful experiments in transmitting images in 1926. In
1923 Vladimir Zworykin also applied for a patent. His was for a television
camera that converted optical images into electrical pulses.
Police begin using the Lie Detector - 1924
The first
modern "lie detector" - Polygraph test was developed by John A. Larson, a
medical student at the University of California
in the USA, in
collaboration with a police officer.
Frozen Food - 1924
Clarence
Birdseye invents process for quick frozen food
Loudspeaker
- 1924
Chester Rice and Edward Kellogg at General Electric established the basic
principle of the direct-radiator loudspeaker with a small coil-driven
mass-controlled diaphragm in a baffle with a broad midfrequency range of
uniform response
TV Tube
Patented - 1925
Howard Weinhart - New Jersey
Aerosol Spray - 1926
Erik Rotheim
Lindbergh Crosses the Atlantic - 1927
Commercial Transatlantic
Phone Service Begins - 1927
First talking movie - 1927
Al Jolson stars in
The Jazz Singer, the first
feature-length talkie
Iron Lung - 1927
Philip Drinker and
Louis Shaw
Car Radio - 1929
American Paul Galvin - Galvin coined the name "Motorola"
for the company's new products combining the idea of motion and radio Pluto
Discovered - 1930
Clyde
Tombaugh
Transparent Scotch Tape - 1930
Richard
Drew
First Planetarium - 1930
The Adler Planetarium in Chicago, Illinois, was founded
by Mac Adler.
COAX Cable Patented - 1931
The "concentric conducting system" allowed thousands
of telephone conversations to be carried simultaneously on long distance
circuits.
First Commercial Electric Razor
- 1931
Colonel Jacob Schick marketed the first electric shaver.
Electron Microscope - 1931
Max Knoll and Ernst Ruska |
