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Book by Murphy, Patricia J.
- Sales Rank: #891570 in Books
- Brand: Brand: Enslow Elementary
- Published on: 2004-08-01
- Original language: English
- Number of items: 1
- Dimensions: .32" h x 7.62" w x 9.38" l, .51 pounds
- Binding: Library Binding
- 32 pages
- Used Book in Good Condition
Most helpful customer reviews
2 of 3 people found the following review helpful.
Black Inventors
By SusieQ
My grandaughter had been told by her History teacher who had invented the traffic light. With this information she was able to dispute what was said to her. African Americans would like all of their accomplishments correctly reported especially to the new generation.
4 of 10 people found the following review helpful.
You may want to consider this as well
By Randall Kelley
This seems to be another collection of fabrications, that would be nice if true-- but aren't. Rewriting history to fit an agenda is never a good idea.
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.
The invention of the gas mask predates Morgan's breathing device by several decades. Early versions were constructed by the Scottish chemist John Stenhouse in 1854 and the physicist John Tyndall in the 1870s, among many other inventors prior to World War I.
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