This basically assumes you have traveled through time because George Carlin handed you a time machine and you’re almost too stupid to breathe, or you went through a time rift, or some topologically similar scenario. Because if you invented a #@&^! time machine, you should know most of what’s there.
A moving electric field produces magnetism, and vice versa. Wrap copper around an iron core and run electricity through it, and you’ve got an electromagnet
What I’d want is an old chemistry book that included descriptions of how to obtain and purify chemicals, because that’s knowledge that’s been outsourced.