The first semaphore was built in 1868 by James Percy Knight and was a failure, since one of the two gas lamps (one green and one red),exploded and killing the officer who was in charge.
Was in 1914, on Cleveland, Ohio, where settled the first semaphores , based in a autmoation sistem, invented by Garret Augustus Morgan.
The first semaphore
A lot of greetings
Signed: Álvaro Abel Dávila Jácome-AADJ
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