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Inventions in the Roaring Twenties
Transcript of Inventions in the Roaring Twenties
Sufferers faced blindness, amputation and death, they couldn’t absorb sugar and starch from the bloodstream due to lack of insulin.
1920: Dr. Frederick Banting and Charles Best experimented with animal insulin.
1922: First human trial: Leonard Thompson, 14, who had diabetes for three years and weighed only 66 pounds.
After insulin injection, he gained strength and his blood sugar levels dropped. Similar trials gave the same results - the cure to diabetes had finally been found. Inventions In the 1920s Insulin Radio The greatest invention of the 20’s
Helped to unite Canada - remote areas were brought closer
First radio sets: moving a thin wire “whisker” over crystal
May 1920: XWA sent out Canada’s first radio broadcast
1923: first play-by-play of a hockey game
Edward S. Rogers created the first battery-less radio
Expensive tube radios in elaborate wooden cabinets appeared in stores
Became a status symbol: good radio could cost as much as a car
1928: commission recommended that government set up a coast-to-coast broadcasting system: forerunner to CBC Automobiles Existed before 1920, but only rich could afford them
Henry Ford dreamed of making an inexpensive car that almost everyone could buy
Started using a manufacturing method called mass production
Set up an assembly line that ran from one end of the factory to the other
Workers along the line helped add parts to the car until it reached the end and was ready to be driven
Result was the famous and practical “Model T” at a price that average North Americans could afford
“Tin Lizzy” had a simple box-like design, but could be purchased for around $395
Crank to start the engine included
Now possible for people to live farther from their work: suburbs started to form
Number of Canadians who owned a car went from one in 22 to one in 8.5 Telephones Invented in 1876
By beginning of 1920’s, only 25% of Canadian homes had a telephone
Very different from today
Dialer had to crank a generator to power the phone
Mouthpiece was separated from the earpiece
Needed to ring up an operator to call long-distance.
First regular dial telephone appeared in 1924
3 years later, phones combined mouth- and earpiece
By the end of the decade, 75% of Canadian houses had a telephone
Half of Canada purchased one in the 20’s! Before After brrrRING!