Inventions (1930 - 1940)

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On October 22, 1938, Chester Carlson invented the photocopier! He tried to sell it to IBM, but they saw no use for something that simply made copies. #hindsight #inventions #xerox

On October 22, 1938, Chester Carlson invented the photocopier! He tried to sell it to IBM, but they saw no use for something that simply made copies. #hindsight #inventions #xerox

Original 1930s Monopoly game that was invented by Charles Darrow.

Original 1930s Monopoly game that was invented by Charles Darrow.

U.S. patent drawing for the first successful ballpoint pen, invented by László Biró.

The Man Who Changed the Way We Write

U.S. patent drawing for the first successful ballpoint pen, invented by László Biró.

Carlton Cole Magee invented the first parking meter in 1932 in response to the growing problem of parking congestion.  The first parking meters were used in Oklahoma City.

Carlton Cole Magee invented the first parking meter in 1932 in response to the growing problem of parking congestion. The first parking meters were used in Oklahoma City.

1934 - the invention of George Nissen and Larry Griswold's modern trampoline.

1934 - the invention of George Nissen and Larry Griswold's modern trampoline.

Meet the Man Who Invented the Earthquake Richter Scale: The Richter magnitude scale was developed in 1935 by Charles Richter.

Meet the Man Who Invented the Earthquake Richter Scale

Meet the Man Who Invented the Earthquake Richter Scale: The Richter magnitude scale was developed in 1935 by Charles Richter.

Polystyrene is a strong plastic created from erethylene and benzine that can be injected, extruded, or blow molded, making it a very useful and versatile manufacturing material.

Polystyrene is a strong plastic created from erethylene and benzine that can be injected, extruded, or blow molded, making it a very useful and versatile manufacturing material.

Ballpoint pen - László Bíró

Ballpoint pen - László Bíró

A vocoder, a portmanteau of the words voice and encoder, is an analysis and synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder. The decoder applies these control signals to corresponding filters in the (re)synthesizer. Research physicist Homer Dudley invented the Vocoder at Bell Labs in 1939 which served…

A vocoder, a portmanteau of the words voice and encoder, is an analysis and synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder. The decoder applies these control signals to corresponding filters in the (re)synthesizer. Research physicist Homer Dudley invented the Vocoder at Bell Labs in 1939 which served…

An eyelash curler is a hand-operated mechanical device for curling eyelashes for cosmetic purposes. The earliest patent for an eyelash curler was filed on August 15, 1929 and issued to William E. McDonell and Charles W. Stickel of Rochester, New York on April 7, 1931

An eyelash curler is a hand-operated mechanical device for curling eyelashes for cosmetic purposes. The earliest patent for an eyelash curler was filed on August 15, 1929 and issued to William E. McDonell and Charles W. Stickel of Rochester, New York on April 7, 1931

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