In 1923,Garrett Morganpatented an electric automatic traffic signal. Morgan was the first African-American to own a car in Cleveland. He also invented the gas mask. Morgan's design used a T-shaped pole unit with three positions. Besides "Stop" and "Go," the system also first stopped traff...
We know the famous ones-the Thomas Edisons and the Alexander Graham Bells-but what about the less famous inventors? What about the people who invented the traffic light and the windshield wiper (雨刮器)? Shouldn't we know who they are?
less famous inventors? What about the people who invented the traffic light and the windshield wiper (雨刮器)? Shouldn’t we know who they are?Joan Mclean thinks so. In fact, McLean, a professor of physics at Mountain University in Range, feels so strongly about this matter that she’s ...
阅读理解。 We know the famous ones-the Thomas Edisons and the Alexander Graham Bells-but what about the lessfamous inventors? What about the people who invented the traffic light and t
World War I. This device was popular among firefighters and rescue workers, though racism caused Morgan to hire a white actor to pose as the “inventor” in order to boost sales. Finally, Morgan invented a more efficient sewing machine, drawing on his experience as a sewing machine mechanic....
She and her husband took out a patent for the system in the same year, and they were awarded the patent three years later in 1969. Home security systems commonly used today took various elements from her design. The Three-Light Traffic Signal, Invented by Garrett Morgan in 1923 Fotosearch/...
Walker Invented Her Hair Care Products Garrett Morgan Getty Images 1877-1963 Garrett Morgan was a prolific Black inventor whose early patent for an improved sewing machine design provided financial security for him and his family. The Kentucky native was also concerned about the welfare of others....
Walker Invented Her Hair Care Products Getty Images Garrett Morgan 1877-1963 Garrett Morgan was a prolific Black inventor whose early patent for an improved sewing machine design provided financial security for him and his family. The Kentucky native was also concerned about the welfare of others....
We know the famous ones—the Thomas Edisons and the Alexander Graham Bells—but what about the less famous inventors? What about the people who invented the traffic light and the windshield wiper(雨刮器)? Shouldn’t we know who they are? Joan Mclean thinks so.In fact,Mclean,a professor ...
We know the famous ones—the Thomas Edisons and the Alexander Graham Bells —but what about the less famous inventors? What about the people who invented the traffic light and the windshield wiper(雨刮器)?Shouldn’t we know who they are?