I think it is Morse Code.
Morse code.
Samuel Morse- American artist and inventor known for his invention of the electric telegraph and the Morse code became an international code used for telegraph and new messages around the world.
HOW THEY MADE A MORSE CODE MACHINE Samuel F.B. Morse and Alfred Vail developed an electric telegraph which sent pulses of electrical current to control an electromagnet that was located at the receiving end of the telegraph wire.
A message transmitted by a telegraph is called a TeleGram.
They were usually called telegraph operators.
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The practical electric telegraph system was invented by Samuel Morse, also the inventor of the Morse code.
Originally created for Samuel F. B. Morse's electric telegraph in the early 1840s.
Samuel Morse invented the telegraph and the code that the telegraph used (Morse code).
To spend messages back and forth electronically by cutting an electric signal like Morse code
Yes, they did. In fact Morse code was invented for the first electronic telegraph.
The airport code for Telegraph Creek Airport is YTX.