Each of the three compressors took hydrogen gas from a low-pressure supply at .75 lb/in^2 and compressed it to 2000 lb/in^2. The compressors required 25 horsepower, and were four-stage and water-cooled. Victor J. Johnson, project leader for plant operations, shown standing in front of a bank of air-operated selector valves which connected the compressors to either of the two hydrogen liquifying symbols.
National Institute of Standards and Technology
National Institute of Standards and Technology