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It was about 1800 years between the first steam engine and a practical steam engine. I’m sorry that one or two generations is too long for you.
TIL. That sucks.
Well, there were a lot of fundamental steps that had to be completed first, not least of which was a high pressure vessel. This all took a lot of materials science, advancement in seemingly unrelated fields, etc., etc. Not unlike fusion technology… The difference is we have 2000 years more advancement than they had when they invented the steam engine.