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1920's Inventions

English
by

Len Cottle

on 22 November 2012

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Transcript of 1920's Inventions

Inventions of the 1920 - Was invented by Henry Ford on July 30th 1920
- The automobile was the most popular invention in the 1920s.
- This invention provided new career opportunities for people
- It improved transportation
- One of the contributing factors towards the 1920's prosperity and successful economy
- Over the first few years of the 1920s, the automobile became a hit with everyone, especially young people
- sparked the creation of a whole new industry in America (automobile industry) Polygraph (lie Detector) By Ghislaine Cottle, Mannon Peek, Jacqueline Love, and Jacara Droog The Radio "Radio and Television." History.com. A&E Television Networks, 2012. Web. 18 Nov. 2012. <http://www.history.com/topics/radio-and-television>. Jacara Grebe CR-12 Radio "Welcome to Grebe Radio." Welcome to Grebe Radio. N.p., 07 May 2008. Web. 18 Nov. 2012. <http://www.greberadio.com/?paged=3>. Bibliography Jacara's Citations Golden Age of Radio Controversy over who invented the radio because many people were involved
Most people credit Guglielmo Marconi as the inventor of the very primitive "radio"(wireless telegraph) in 1899 which sent Morse code messages without connecting wires
However, it wasn't till 1906 when Reginald Fessenden developed the first sophisticated radio transmitter
On Christmas Eve of that year he sent out the first program of music and speech History 1920's Known as the "Golden Age of the Radio"
Radio boom began
From 1922-1923 the number of homes with a radio tripled
Radio stations began to experiment with advertising during radio shows as a way to finance programming
Radio advertising expanded with the creation of networks i.e. NBC (1926), CBS (1927), and MBS (1934) Alfred, Randy. "Sept. 29, 1920: Radio Goes Commercial." Wired.com. Conde Nast Digital, 29 Sept. 2008. Web. 18 Nov. 2012. <http://www.wired.com/science/discoveries/news/2008/09/dayintech_0929>. The Radio's Impact on Society: Then and Now 1920's The radio had a large impact on society in the 1920's because:
It was a new way for people to entertain themselves
It was a much faster way for people to receive information
It was the first time that sports and music-two major aspects of society- were broadcasted Society Today Today, the radio still holds a significant impact on North American society
Many different cultural experiences such as commercials, music, news, sports, are broadcast daily on the radio
Radio has evolved since then and is available to people via the internet Jacara Jacara 1920
- Harding: "return to normalcy"
- from a wartime economy to a peacetime economy
- The U.S as the richest country in the world
- consumerism Inventions in the 1920's

1920
The band-aid
Automobile with Combustion Engine

1921
The first robot has been build
The lie detector

1922
The first 3-D movie is released.
The radio became popular

1923
traffic signal.
The television or iconoscope
Clarence Birdseye invents frozen food.
The Bulldozer

1924
The dynamic loudspeaker
Notebooks with spiral bindings invented.

1925
The mechanical television a precursor to the modern television

1926
liquid-fueled rockets.

1927
a complete electronic TV system.
Technicolor invented.

1928
Bubble gum invented by Walter E. Diemer.
the electric shaver.

1929
car radio. The Automobile The Bulldozer

-Invented by Benjamin holt in 1923

-It started off by building a "crawling tractor" and made the design into the bulldozer

-The creation of the bulldozer contributed to the booming economy in the 1920's because it provided a cheaper way to knock down useless buildings http://home.total.net/~galcar/html/brief_history_of_the_polygraph.html

http://polygraphinnovations.weebly.com/innnovation-social-impact.html

http://www.howstuffworks.com/lie-detector.htm Ghislaine's Citations -In 1925 Leonarde Keeler, (who worked with Larson during investigations) improved the Polygraph by replacing the previous use of smoked paper (paper covered with smoke particle and the scratched off) with Inked pens to record the changes with the blood pressure and breathing in the subject. -John A. Larson (a Canadian) was the inventor of the polygraph, in 1921
-He was a medical student at the university of California when he invented the polygraph and became employed by the police department
-The lie detector used pulse rate, blood pressure, and breathing rate to determine if the subject was lying Manni Jacqueline Jacqueline Ghislaine Impact
on Society Lowered The crime rate
-Criminals became more hesitant to rob stores or break the law because they would later be caught and not able to lie

Created more Jobs
-Manufacturing and distributing of the Polygraphs created many new jobs

Contributed to entertainment
-Many new shows developed that used the polygraph (such as "the moment of truth" and "doctor Phill") Jacqueline's Citations http://www.donwayford.com/lincoln.html

http://www.chermsidedistrict.org.au/chermsidedistrict/01_cms/details.asp?viewMode=printable&ID=111 However the Polygraph has been proven unreliable and beatable.

It is no longer admissible as evidence in Canadian court since 1987
It is still used as an investigative tool, however Manni's Citations "Discovery Channel." Inventions That Shook The World : 1920s. N.p., n.d. Web. 22 Nov. 2012. <http://watch.discoverychannel.ca/inventions-that-shook-the-world/inventions-that-shook-the-world-1920s/>.

"The 1920's - Roaring Twenties - The Nineteen Twenties in History." The 1920's - Roaring Twenties - The Nineteen Twenties in History. N.p., n.d. Web. 22 Nov. 2012. <http://www.1920-30.com/>.
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