Back in 2015 I made an #AR installation for the world heritage #rockcarving site in #Tanumshede, so I found it very interesting to see similar tech used to teach visitors about the workings of the #Grimeton #VLF #Radio Station.

It's a world heritage site on account of being the last operational long range mechanical radio transmitter, its design pre-dating vacuum tubes! It transmits #morsecode using a big spinning alternator wheel to generate a 17.2kHz signal which can reach New York and beyond