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Commercial Radio Broadcasts
Radios had been around since the early 1900's. They were used in order to keep the public informed on how the war was going and small broadcasts. In the 1920's was when the first licensed commercial radio station was invented in the United States. Henry p. Davis was the man that invented the radio station, KDKA. The reason that they were able to make this station was because the population now almost all had radios to broadcast through. -
Polygraph Macine
John Larson was a medical students at the University of California, and he is credited with the invention of the modern polygraph instrument of the 1920's. The machine of the 1920's measured a person's pulse rate, blood pressure, and respiratory rates in order to determine if the person was lying. The results were then transcribed onto a rotating drum of smoke paper. -
Toaster
The invention of the pop-u toaster was a great way to save time and money. It would save time because you would not have to be watching the toast to make sure it did not burn, as well as money saver because it is dangerous to have a fire while holding a piece of bread over it. It was a great fire hazard. Charles Strite knew these problems and wanted to fix them. Although the electric toaster was invented in the 1919, the first commercially available pop-up toasters were in 1925. -
80 Column Punch Card
They were not the first punch cards to ever be invented. The French were already using holes in their cards in order to operate their textile machines. But the cards made from IBM, became the standard punch cards, for running data processing machines, for approximately 50 years. -
Sliced Bread
The invention of sliced bread may not seem like much of a technological advancement right now, but in the 1920's it was great. Bread was being sliced by a machine which Otto Fredrick Rohwedder invented in 1928. The invention of the bread slicing machine led to the new way of packaging and selling bread.
