Ask Lemmy
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Glasses. Not for me, but to show the Romans that some that can't see shit that magic glass can make them see better. Either that or a magnifying glass, so it can double as a fun trick of sunlight burning, which, hopefully, can teach them to make concave/convex glasses for people.
A sewing machine. It's electric, but by opening it up and trying to replicate the pattern manually, those old, fully manual ones could be built.
A world atlas. Maps weren't exactly common and, for most of human history, unreliable, so having something like that would be extremely valuable, even if it lacked some info like terrain elevation or type of environment.
Antique stores often have old Singer treadle sewing machines. Needs zero electricity to run and easy to repair.