Technological+Developments+and+Inventions+(Megan+B.+and+Conor+S.)

. During the 1920's, more than just technological inventions were being created, but also inventions in medical science, manufacturing, and transportation. In 1920, Henry Ford created the first car with a combustion engine which was cheaper than previous cars and made it cost efficient for the middle class families to afford. Also in 1920, William Potts, a police officer from Detroit, invented traffic lights which consisted of red, yellow, and green lights and wires. The invention of the traffic light made it safer for drivers since cars were new in that time period. The next year in 1921, John A. Larson, which was a medical student in California, created the first lie detector test. The device measured breathing and the heart rates to see if a person was telling the truth or not and if both was high, an alarm would buzz. This invention helped a lot during criminal investigations because professionals used this to see who was lying or not. 1926, the first liquid fueled rocket was invented by Robert Hutchings Goddard. This was very significant during the first World War because it was used as armed weapons as a fight against others. One of the biggest inventions during the 1920's, was Penicillin. This antibiotic was invented by Sir Alexander Fleming while studying bacteria. Even though it wasn't FDA approved at the time, after World War I many Americans began using that to kill different diseases that had been spread and became a life saving drug. These inventions of the 1920's are used a lot of day-to-day life of Americans and brought a lot of innovation during that time period.

http://www.msad54.org/sahs/socialstudies/finely/1920s/1920gr3/inventions.html

People were also starting to become much more relaxed at that time too, such as when Clarence Birdseye invents frozen food in 1924. Then in 1927**
 * The 1920s in the United States, called “roaring” because of the exuberant, freewheeling popular culture of the decade. The Roaring Twenties was a time when many people defied Prohibition, indulged in new styles of dancing and dressing, and rejected many traditional moral standards. Therefore the inventions and technology were based around the culture. At the beginning of the 1920s, the tommy gun was patented by John T Thompson along with the Band-Aid invented by Earle Dickson. Soon after, in 1921 artificial life begins when the first robot and lie detector are built. This is when technological inventions are starting to progress, especially in the medical field as well.Insulin is invented by Sir Frederick Grant Banting.**
 * Entertainment was a huge part of the roaring twenties. Especially with films and shows, leading to the first 3-D movie (spectacles with one red and one green lens) released in 1922. Then Garrett A. Morgan invents a traffic signal in 1923 creating safer transportation in the United States.**
 * The television or iconoscope invented by Vladimir Kosma Zworykin is another example of this fun entertainment age.
 * Philo Taylor Farnsworth invents a complete electronic TV system with** **Technicolor being invented as well. Televisions were now starting to become popular in homes.** **Jacob Schick patented the electric shaver in 1928 following the blow drier. This shows how beauty and appearance were essential in the 1920s and people had to look good. And last but not least, in 1929****, American, Paul Galvin invents the car radio. So not only is there the car, but a great source of entertainment inside of it too. All of these inventions that were made throughout the roaring twenties are all still used daily today and are still the largest forms of entertainment we have as well.**
 * http://inventors.about.com/od/timelines/a/twentieth_3.htm**


 * First TV:**

http://crazy-frankenstein.com/entertainment-files/story-files/story-about-our-shiny-friend-television_files/first-tv-set.jpg