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Елена Awramenko
Елена Awramenko
Ucrania

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Inventions

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Елена Awramenko
1

America money screen people viewers invention ship 1928 television watch Scottish 1920s changed sea 1924 colour

Three popular inventions from the 1920s

The was an exciting time for inventions . Some of the things invented around that time the lives of millions of , and some of those inventions are still widely used today .
The television

The with the biggest impact was probably the . It was invented by a man , John Logie Baird . The first televised pictures were sent over a short distance in , and his invention was formally demonstrated at the Royal Institute two years later . The pictures on the were not clear , but the could see that they were human faces , and they could see their eyes opening and closing . In , images were sent from Britain to , and later , to a 1 , 500 miles out to . In the same year , the first images were sent . The first ? seeing - in sets ? were sold that same year . For £25 ( £1000 in today ? s ) , people in their homes could moving images that were sent from a broadcasting station .


2

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The polygraph

interesting invention of the 1920s was the , or lie detector . It was invented in 1921 by a Californian , John Larson . He used the ideas of other to make a machine that measured people ? s heart rate , breathing and blood pressure while they asked . The experts believed that sudden changes in these measurements showed that was lying . Although this invention is well - known , it can ? t really lies . Marston tried to use from his polygraph in a court case in , but they weren ? t accepted as evidence and never have been since then . However , polygraphs are still used by some police and the FBI because many people they work , so they tell the truth to avoid the .

3

cool fresh refrigerator unnecessary USA popular People interested ways British 1913 model advantages price

The fridge

Another invention that became popular in the 1920s was the home . used different to keep food and long before the 1900s , but home fridges weren ? t invented until in the . Home fridges became very in the USA in the 1920s . Sales of the popular ? Frigidaire ? increased from 5 , 000 in 1921 to 750 , 000 in 1926 . people were less in fridges than Americans . They thought that they were because the weather in Britain was cooler . But fridges were heavily advertised , and their were described in detail . Soon , more fridges were sold , and the decreased .

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