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Period: to
Pre 50's
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Lie Detector
John Larson was the one that made it. The theory is that when a person lies, the lying causes a certain amount of stress that produces changes in several involuntary physiological reactions. A series of different sensors are attached to the body, and as the polygraph measures changes in breathing, blood pressure, pulse and perspiration, pens record the data on graph paper. -
First Robot Built
It was the first and only Robot in 1921. It was invented as a helper robot. It was a faliare after a while because the programming was a faliure. -
Tracffic Signal
They were installed in London by the house of commons. They were invented by J.P. Knight. Best know of all inventions related to traffic control. -
Car radio
In 1929, American Paul Galvin, the head of Galvin Manufacturing Corporation, invented the first car radio. The first car radios were not available from carmakers. Consumers had to purchase the radios separately. -
Jet Engine
The earliest attempts at airbreathing jet engines were hybrid designs in which an external power source first compressed air. It was one of the first engines to be invented. -
Stereo Records
It was a large disc that went into a record player. It was a fun and good thing. It was quite popular too. -
First Drive in Movie
It allowed people to watch movies outside or in their vehicles. It played a lot of various types of movies. It was another way to bring a fancy car and show it off on a date. It was the cheapest way to watch a movie comfrontable. -
Radar
The history of radar starts with experiments by Heinrich Hertz. In the late 19th century that showed that radio waves were reflected by metallic objects. -
Photocopier
Model 914 was made to make 100,000 copies a month. Most current model photocopiers use a technology called ‘Xerography’. This uses a dry copying process using toner and heat. Chester Carlson lived in New York and was the first one to creat and build a photo copier. -
First Built Helicopter
Igor Sikorsky made the first helicopter that worked well in 1940. Others made them but they were not well built or sucessful and Igor design is just like the ones they make now days. He named his helicopter VS-300. -
Color TV
Peter Goldmark invents modern color televension system. It was the first Colored tv. If you want one like this then it will be hard to find. There was not to many color tv's because they took weeks and weeks to make them. The rich people were the only ones able to afford them. NBC was the first one to broadcast with a color tv. -
Microwave
It was invented by Dr. Percy Spencer. He created a metal box and put food in it and it heated up. It was about 750 pounds it was real heavy. It made cooking a lot faster for people. -
Jeep
It was the firdt jeep of its kind. They did not really know what it was. It went 60 mph and it was 4 wheel drive. After everyone figured out what the jeep was bantam company wanted to make more and sell them. Lots of people used them for war cause they were heavy duty. -
Jukebox
It was the first music machine invented besides the record player. When a jukebox played it meant you needed to dance. Resteraunts put them in there so custumors to come in. Louis Glass and William S. Arnold made the first jukebox that people put there quaters into. -
Telephone
It was the newest hit. Everyone thought they should have one. It was the first thing that made speech electonic. Alexander Graham Bell was the inveter to this. He was amazed how he could hear sound through a wire.
