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The setting I'm working on has a parallel world alongside modern-day Earth. This world is Earth-like, though there is somewhat limited magic as well (e.g. people can be transformed into animals and vice-versa), and the overall technology level in the parallel world is Middle-ages (castles, horse-drawn wagons, the usual stereotypical-fantasy setting. ^_~ )

Travel to/from this world is rare, and is through portals which, among other things, transform items being brought through them to the appropriate tech level. So, for example, a shotgun going through comes out as a crossbow, and a chemistry textbook becomes a tome discussing alchemy and potion-mixing. The portals don't affect people's knowledge the same way, though, so something else needs to happen to keep people from, say, learning how to make gunpowder or internal-combustion engines or whatnot in the modern-day world and bring that knowledge across to the lower-tech world.

My plan to keep the world at the lower tech-level despite higher-tech is that certain physical properties in the magic-active world are different enough that knowledge of Earth-side technology won't transfer. Saltpeter + charcoal + sulphur doesn't explode, the Bessemer process doesn't produce steel, spinning a wire loop inside a magnetic field doesn't produce electricity, etc. Also, no or limited coal/petroleum reserves reduces access to concentrated power sources.

So, what foundational technologies would need to work differently, and what resources would need to be limited/restricted, to prevent a Middle Ages-level society from progressing further in technology despite modern-era knowledge being brought in. As to why things work differently, I'm happy to just say "because magic" if needed, I just need to know what to break.

A few I've already thought of:

  • Metallurgy (e.g. limited/unreliable steel production)
  • Electricity & related tech
  • Power sources (limited/no coal or petroleum)
  • Chemistry, esp. plastics & composites
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  • $\begingroup$ "spinning a wire loop inside a magnetic field doesn't produce electricity" - be careful when changing fundamental forces like electromagnetism. Easy to make universe impossible. $\endgroup$ – Mołot Oct 16 '16 at 8:44
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    $\begingroup$ Just a point, steel was invented in 13th century BCE. $\endgroup$ – Bellerophon Oct 16 '16 at 9:08
  • $\begingroup$ @Mołot - like I said, I'm ok with going "because magic" for things like that. $\endgroup$ – Salda007 Oct 16 '16 at 9:32
  • $\begingroup$ @Bellerophon - yes, and that's fine. I'm more concerned with high-rate steel production methods like puddling furnaces and Bessemer furnaces, where you see steel production on the order of tons instead of ounces or pounds. $\endgroup$ – Salda007 Oct 16 '16 at 9:34
  • $\begingroup$ are you asking for practical solution to allow semi permeable technological exchange between 2 parallel universes each with unique set of physical constants with the help of magic? $\endgroup$ – user6760 Oct 16 '16 at 12:03
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I think the only really "reasonable" way to do this is basically to say "Magic just makes anything that seems too 'modern' arbitrarily not work".

People are creative, and technology is all based on the fundamental workings of the universe. You can reduce access to some kinds of technology by making common materials for it hard to come by, like making iron or coal rare. But then if the physics of steam expansion still apply, you can still build a steam engine by replacing many of the parts with wood. It won't work as well as a machine made mostly of iron, but it will still work as long as the laws governing pressure differentials (the same laws that allow you to pull air into your lungs) and the laws governing expansion of hot gasses (the same laws that cause hot air to rise) still apply. If you try to change those laws, you break a lot more than just modern technology.

Similarly with the Bessemer Process -- you basically blow a bunch of air through a giant container of molten iron; the oxygen burns the impurities out. AFAIK the chemistry that allows this to work is the same as in small-scale steel manufacturing. Preventing it from working by any means other than hand-waving while still allowing other medieval uses of iron/steel just isn't going to work. And even if you're ok with removing steel entirely, making the refining process not work requires changing combustion. (Or maybe adding an impurity that can't be removed by combustion, but someone could still think of a way to deal with that).

Also, the more you go into detail on why modern technology doesn't work/isn't possible, the more detail people like me will have to be able to pick apart the workings of the world. Speaking for myself, whenever I notice that kind of logical or scientific inconsistency in the workings of a fantasy world, my suspension of disbelief is instantly shattered, and I tend to put the story down for a while to stop and think through just how broken the system is.

On the other hand, if you just you just say "no technology because magic", then there's not really those cracks in the logic to pick at. There's no point where I can notice and stop reading to say something like "but wait, if heat doesn't cause gasses to expand, hot gasses won't rise, so why don't all fires just rapidly die out when the air around them has its oxygen content exhausted?"

tl;dr: There's no reasonable/plausible way to break/prevent only modern technology while still allowing a medieval world to work as you would expect. Just ban modern technology by magic and leave it at that.

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You don't have to invent anything, it's enough to have a ruling class on a low level world that discourages progress, search for banning the printing press in Ottoman Turkey & how China nearly went through industrial revolution until the new emperor banned it.

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  • $\begingroup$ I don't think that would work long term with people knowing what technology is available. $\endgroup$ – Bellerophon Oct 16 '16 at 10:00
  • $\begingroup$ Knowing about something and being able to make it is completely different thing. Progress is actually an exception rather then rule, it only looks that progress is by default since by miracle it happened in the west, and west spread it , quite often by gunpoint I might add, throughout the world. Usually progress is glacial if any occurs. $\endgroup$ – Platypus Oct 16 '16 at 10:07
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    $\begingroup$ Top-down control really wouldn't work for this. If a country is refusing to develop firearms and advanced manufacturing because the leader bans them, while their rival neighbor is happily industrializing and cranking out high-capacity firearms and artillery, that's going to go very, very poorly for the first nation. $\endgroup$ – Salda007 Oct 16 '16 at 11:25
  • $\begingroup$ My point is that if a nation sees what is available and then someone turns up offering to give them it then eventually the nation will accept the offer. $\endgroup$ – Bellerophon Oct 16 '16 at 14:36
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First you need to eliminate high density power sources which really powered the Industrial revolution and pushed us into modern technology. You could significantly reduce the amount of coal in the world which would stop small portable steam engines on things like trains. No trains means no movement of people. This stops social movement and also reduces the sharing of technology. It also stops trade between easy trade between America, with its huge mineral resources, and Europe. No steam engines also means no water pumping, no deep mining, less coal/iron. It is a vicious cycle. This lack of power prevents much electricity generation so no mass production of stuff. Overall the most technology you get it would be 16-1700s level.

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An easy solution to this is "cause magic" and the wizard king has banned technology that he thinks is too advanced or the public has very little use for those kinds of things, because they can create a equal quality of life with a small amount of technology and magic.

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