Day 7 Thomas Stewart – 28 days of Black History in Technology

Thomas Stewart patented a new type of mop, but that’s not why he is listed as Day 7 Black History in Technology.  He is listed because he co-patented an improved station and street indicator in 1883. It was used with railways and street cars to signal what road or street the vehicles were crossing.

Their indicator would automatically activate a signal by means of a lever on the side of the track.

While this fact might be short, his contribution along with William Edward Johnson, has saved hundreds, if not thousands of lives.


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