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Solar energy lamp manufacturers focus on low carbon environmental protection mobile signals
On August 5, 1914, American traffic light company in Salt Lake City police officer Lester Wire creation based on improved, created a set of electric signal system, this is the top in human history set electric lights system put into use. The top light power signal is placed in Cleveland Euclidean road east 105th street intersection, as long as the two colors red, green, buzzer will warn before the light switch. Then American cities like New York, Chicago, and adopted the traffic lights.
How the red and green lights has become now you know the color red, green, yellow light? One theory is that comes from the Chinese Hu Ruding. Hu Ruding early study in the United States at Cornell university, Massachusetts institute of technology in 1925 Edison chairman of general electric (ge) and the Massachusetts institute of technology (MIT) jointly organized a learning in class, is a student of Edison.
Hu Ruding ge company working hours in the United States, such as a green light at the crossroads once, when the green light to quickly open, and a speeding car, and his heart palpitations of thought of in the center of traffic light and a yellow light, the proposal also received the affirmation of the U.S. government and the support, yellow lights and introduce to the world.
But that is not very strong, because back in 1918, New York City has presented the top red, yellow, and green light -- - it is three color circle all around projector, installed in a New York City on 5th street, one of the towers. In 1920, the United States Detroit police officer William Potts also developed patent holders with a light yellow light of three colors, four direction. After multiple traffic lights to create patents have yellow light. But you can be sure that Hu Ruding did push forward the three color signals.