Science Art: Single-Acting Force Pump with Ball Valves, 1903.

Scientific illustration of a pump with ball valves, from a textbook on mechanics and mechanical engineering

Scientific illustration of a pump with ball valves, from a textbook on mechanics and mechanical engineering

Among all the diagrams of force-vectors, there’s this wonderful illustration of a well-made machine in A Text-Book of Applied Mechanics and Mechanical Engineering, on archive.org.

There’s little reason why a pump made to these specifications in 1903 wouldn’t still be operating, unless it had had been left idle and allowed to rust through somewhere. It makes you wonder.