why people lie about garretta a morgan inventing the first traffic signals?
Invented by Garrett A. Morgan in 1923? No!
The first known traffic signal appeared in London in 1868 near the Houses of Parliament. Designed by JP Knight, it featured two semaphore arms and two gas lamps. The earliest electric traffic lights include Lester Wire’s two-color version set up in Salt Lake City circa 1912, James Hoge’s system (US patent #1,251,666) installed in Cleveland by the American Traffic Signal Company in 1914, and William Potts’ 4-way red-yellow-green lights introduced in Detroit beginning in 1920. New York City traffic towers began flashing three-color signals also in 1920.
Garrett Morgan’s cross-shaped, crank-operated semaphore was not among the first half-hundred patented traffic signals, nor was it “automatic” as is sometimes claimed, nor did it play any part in the evolution of the modern traffic light.
I’m not sure where you got that stuff, but here’s some other data that conflicts with your own:
On 10 December 1868, the first traffic lights were installed outside the British Houses of Parliament in London, by the railway engineer J.P. Knight. They resembled railway signals of the time, with semaphore arms and red and green gas lamps for night use. The gas lantern was turned with a lever at its base so that the appropriate light faced traffic. Unfortunately, it exploded on 2 January 1869, injuring the policeman who was operating it.
On Potsdamer Platz, Berlin Germany, it is widely claimed (though this is subject to some disagreement), that the world’s first electric street lights were installed there in 1882. What is not refuted is that Europe’s first traffic lights were erected there in 1924 in an attempt to control the sheer volume of traffic passing through. These lights were mounted on a five-sided 8.5 metre high tower, at the top of which a policeman sat in a small cabin and switched the lights manually, though they were automated after a few years (a replica of this tower was erected in the late 1990s close to its original location).
The modern electric traffic light is an American invention. As early as 1912 in Salt Lake City, Utah, policeman Lester Wire set up the first red-green electric traffic lights. On 5 August 1914, the American Traffic Signal Company installed a traffic signal system on the corner of 105th Street and Euclid Avenue in Cleveland, Ohio. Based on the design of James Hoge, it had two colors, red and green, and a buzzer to provide a warning for color changes. The first four-way, three-color traffic light was created by police officer William Potts in Detroit in 1920. In 1923, Garrett Morgan patented a traffic signal device, although it did not directly impact the evolution of the modern traffic light.
The first interconnected traffic signal system was installed in Salt Lake City in 1917, with six connected intersections controlled simultaneously from a manual switch. Automatic control of interconnected traffic lights was introduced March 1922 in Houston, Texas. The first automatic experimental traffic lights in England were deployed in Wolverhampton in 1927.
London Fashion Week SS10 Topshop Unique – Topshop Video 59
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i like art posters specially if they depict something about nature and beauty ”
art posters are great for room decoration too, i use art posters on my bedroom as decorations .~;
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