They aren’t connected via a very long wire, are they?
P.S I’d like to understand the physics behind it, not how Morse code works.
In: Technology
It was literally done with wires. Back in the day, sending a telegram was called ‘sending a wire’ and when radio came in it was known as ‘wireless telegraphy.’ If you look at pictures of old time steam trains there’s almost always a telegraph wire running next to the train tracks.
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