Warhammer 40K Mechanicus is a turn based tactical game about making spooky scary skeletons go back to sleep and stealing all their stuff. Many thanks to @Ext...

An intriguing piece of retro gadgetry that lets you view the magnetic patterns recorded on tape.

A modern day version can be found here: https://store.arnoldmagnetics.com/product/284/magnetic-viewer-b-1022

Special thanks to Andy on Twitter who first made me aware of this device back in 2016
https://twitter.com/andyAVAVsystems/status/786861354594492416?s=20

FAQs
Q) CAN IT SEE WHATS ON A FLOPPY DISK?
A) No - It didn’t show anything on a 5.25” floppy I tested (BOTH SIDES)
Considering the viewer is pretty much maxed-out for resolution by an 8 track, (8 tracks recorded on a tape 1/4” wide at 3.75 ips) I’d imagine that anything more dense than this will be beyond the capabilities of what can be displayed by the device. I’ll try an 8” disk soon - but I would be shocked if it shows anything for the same density reasons  

Q) You can buy these sheets of magnetic viewing paper that do the same thing.
A) They don’t have the same resolution or sensitivity - at least the ones I’ve bought don’t. They can’t show the magnetic…