Sailing Seven Seas: A History of the Canadian Pacific Line | 
I am about 99.9999999% certain that psi is actually POUNDS per square inch, not parts per square inch, especially when talking about boiler pressure 🧐
wanderinglynn You are correct. That‘s a terrible mistake. 3y
BookDadGirlDad So much for research and editing........ 😂 3y
rabbitprincess @wanderinglynn I did quickly google to see if I was wrong, and parts per square inch seems to be a measurement used in component packing 😆 @BookDadGirlDad The author normally writes about aviation, but psi would be pounds per square inch in that field too! The other research might be fine, but this went straight back to the library. 3y
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