Cannot remember the title or author of this fantasy book. Scientist invented a machine that landed them in an alternate world in the field of a dwarf who had been trying to find the recipe for aluminum so he is considered an official Wizard. The scientist also helps a knight by putting ground polished glass in his helmet so he can see. This was a very funny book.
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I just finished re-reading that trilogy. Simon Hawke, The Reluctant Sorcerer (1992), The Inadequate Adept (1993), and The Ambivalent Magician (1996).
Let's see, the dwarf is a leprechaun, the knight is a nearly blind bandit that 'Brewster Doc' makes lenses for, and aluminum is the Philosopher's Stone.