system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Is it possible to build a magic detecting machine?

In the books, it's often said that electronical devices don't work in Hoghwarts cause there is too much magic in the air. But this do imply that magic somehow interact with electromagnetic waves, so it should be possible to build a device that picks up this interference, basically creating a magic detector.   


Also, if magic do indeed act as an electromagnetic interference, would it be possible to build "magic proof" machinery capable of operating in highly magical areas?
gpt
We don't know *why* certain technology doesn't seem to work around magic, but it is *probably* predictable on some level.

If nothing else, you could probably build a machine whose job is to perform calculations, and if they're accurate it turns on a green "no magic detected!" light. If the machine can't function due to magic, the calculations don't work, the light goes off.

The problem is that you probably couldn't make it activate a *siren* or something, since that could malfunction, too. Maybe you could build a transmitter, and a far-away device would activate if the signal ever stopped, sort of a dead-man's switch.

Kind of makes you wonder what all those cold war number stations were *really* for, huh.