Panorama of the Moving Boardwalk circa 1900.

From Edison films catalog: This picture was taken from the stationary platform, showing the rapidly moving board walk on the outer edge, which has a speed of five miles per hour; also shows the middle platform moving two and a-half miles per hour, the third platform being stationary. At intervals there are upright posts to steady passengers passing from one platform to the other. By watching these uprights passing by the camera and passing each other, a good idea of the speed is obtained. The structure is crowded with passengers, some gliding by, standing still, other walking and running and stepping from one platform to the other. Filmed in July 1900, at the Exposition Universelle in Paris, France. (Video courtesy of Edison Manufacturing Co./Library of Congress/Tehrkot Media)