Something that people miss though is that they do hit some roadblocks that if not for some extremely lucky coincidences, they wouldn’t have any way to do it. Specifically for various materials that just so happen to be around them.
There was a short story I read ages ago in some collection somewhere I’ve been dying to find. I think it was from the 60s or 70s, but a scientist brings a man from the future and the man is just a normal guy, so he can’t explain anything to the scientist’s satisfaction and the scientist gets more and more exasperated.
The dialogue was like:
“What is the dominant mode of transport in the future?”
“Oh, we fleem.”
“Fleem? What’s fleem?”
“It’s a kind of garbol but with more slimp.”
“Okay, never mind. How do you do it?”
“Oh, that’s easy, you simply merfingle the blem and you’re fleeming away!”
Reminds me of a short story I read in the 70s. I ended up having to go to the house I read it in (a decade ago) to find the book it was in, now everyone in my family owns copies of that book (Alfred Hitchcock’s Best in Suspense if I recall, not getting up to look) just so we can do Halloween readings of the story that made us all jump every time we saw anything move out of the corner for our eyes for like a week the first time we read it. They Bite by Anthony Boucher. Great story.
Umm you go to the beach and something about certain grains will be different. Look mate, see how you boil liquid. Do that with milk until just before it boils and that’s the milk now pasteurised which means it will kill the things in it that make you ill. Also boil the water before drinking it?
That’s all I got. I guess sphagnum moss is good for absorbing blood/dealing with wounds?
Rudementary magnets, in the form of lodestones, have been known since antiquity. Wire, on the other hand, is a modern miracle. You can’t hand-forge that.
Let’s see… electricity in a preindustrial environment. You’ll get into Factorio levels of invent a tool to make a tool to make a tool…
Copper wire existed at the time, (depending on the time period) but drawing it involved a person on a swing pulling it through a hole in a metal plate. So we need a metal plate. Surely there is a town blacksmith? We will need a few plates with gradually decreasing hole diameter. Enough wire for a demonstration would be difficult and expensive, but not impossible. Could also use copper busbars instead of wire.
Now that we have conductors, we have to figure out what method of generation we want. Rather than trying to make bearings, balanced shafts, and stacks of thin metal plates all identical and radially symmetrical so we can make a generator, we should first attempt a battery. For this we can get away with stacks of two dissimilar metals in a glass or ceramic jar, bathed in some sulfuric acid. Aqua Regia was a mixture of nitric acid and sulfuric acid, but it might dissolve copper and zinc plates. Could also use lead plates, those are easier to hammer out flat. With this we could get an output around 2v per cell, put a half dozen of them together in series and one could build a simple arc lamp.
After the proof of concept demonstration, hopefully you’d interest more smiths in the project, increasing your talent pool. With some mercury and wire you could build a version of Faraday’s homopolar motor.
This bookTells you how to handle this, along with everything else you need to know to rebuild all systems in society from scratch should there be some sort of time machine based accident. It’s a good read!
There’s also [The Knowledge: How to Rebuild Our World from Scratch](!wiki The Knowledge: How to Rebuild Our World from Scratch) by Lewis Dartnel. Great book