The Oil That Never Stopped
In 1872 a railroad fireman who spent his days crouched beside stalled engines invented a device that let heavy machinery run without stopping to be oiled. His idea reshaped how industry measured downtime.
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The Signal Between Moving Trains
In 1887, a self-taught Black inventor found a way for moving trains to send messages to distant stations without wires, turning electricity into a safeguard against deadly collisions.
