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The Radio
*Ernst Alexanderson
*New and improved radio
*Before this era, radios consisted of dots and dashes
*High frequency alternator -
Period: to
Inventions
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Traffic Light
*William Potts-police officer
*Red, green, and amber lights with wire
*United States -
Hairdryer
*Women used to put a flexible pipe in a vacuum cleaner in order to blow dry their hair before the 1920's.
*First ever hairdryer -
Lle Detector
*John A. Larson-medical student
*Photograph -
Q-Tips
*Leo Gerstenzang
*In 1920, they were made out of a toothpick with cotton wrapped around it. -
DIal Telephone
*Alexander Graham Bell
*Had a mouthpiece and earpiece
*In just a few years it was very popuar -
The Loud Speaker
*Invented by Rice and Kellogg
*Sold under 'Radiola'
*Improved sound quality -
Kool-Aid
*Edwin Perkins-Omasha Nebraska
*Originaly named 'fruit smack'
*Also orginally a liquid substance rather than powder -
Penicillin
*Sir Alexander Fleming-Studied bacteria
*Widely used antibiotics
*When invented, it was not approved by the FDA -
Frozen Food
*Clarence Birdseye-Naturalist, United States
*Dressed meat and vegetables would be preserved in wax carboard cartons, after being exposed to high pressures.
