Photograph of the view of the steam engine's valve system. The photograph also depicts the control signal from the pilot house of the steamboat DELTA QUEEN.
Photograph of the DELTA QUEEN's valve system on top of the engine. "The stairwell leads into the hull, and the red spoke wheel at the far right controls the amount of steam to the engine. Passengers were able to walk 'Green Path' on the floor of the engine room."
