The people communicated in many ways like:
The Morse code.
Morse code
to communicate
Morse code.
Morse Code.
morse code.
yes only ponies and unicorns can use Morse code with an apple
Samuel Morse invented the telegraph and the code that the telegraph used (Morse code).
yes. Morse code
Morse code/by a telegram.
Morse code is a code formed by 'dit' and 'dah'. The arrangements of the 'dit' and 'dah' all varies depending on the alphabet. On one can find the Morse code chart from 'Wikipedia', if one desires to learn to communicate with the Morse code.
The Morse Code was made by Samuel Morse in 1844 and they were used to communicate secretly. They mostly are dots and slashes.