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I’m pretty sure scientists back then could have told you that these balloons are too small. The person(s) who drew that picture most likely wasn’t a scientist, which is why it looks how it looks.
Maybe they thought we’d have discovered/created new elements by now that could do this.
Half hydrogen! Or the rare molecule, puffy air.
Well, if we used a pure vacuum, you’d only get about 17% more efficiency than just using helium I think