Cleveland to own one.One day,Morgan was at a busy Cleveland
intersection when he witnessed a particularly bad collision.As he
analyzed what had happened,he realized what the problem was.
[3]Back in those days,traffic signals were just “stop” or
“go”.And a lot of times,the sign would switch while a car was in the middle of the intersection—with no time to get out.That gave Morgan an idea.He created a traffic signal that had a third function—the “warning” sign that had been missing up until that point.And on November 20th,1923,the US Patent Office officially recognized his new invention.
[4]Originally,the traffic signal that Morgan invented had to be operated manually instead of autoswitch.Eventually,he sold the rights to his traffic
signal to
General
Electric Company,which led to the creation of the modern traffic light.
[5]Morgan was born in Kentucky in 1877.As a teenager,he moved to Ohio to find work.At first,finding work was difficult because a lot of businesses would not hire a black man.But Morgan was determined and he became a successful businessman himself—and a newspaper publisher as well.He also invented a number of other products in addition to the traffic signal—including a gas mask that became the model for
the protective masks worn by soldiers during World War Ⅰ.
【2015届高考英语一轮专项复习训练 29】相关文章:
最新
2019-11-15
2019-11-15
2019-11-14
2019-11-14
2019-11-11
2019-11-11