'When Marconi transmitted the letter "S" across the Atlantic in 1901, it was in this form'
Morse code
20th CENTURY STUFF: When Marconi transmitted the letter S across the Atlantic in 1901, it was in this form
When Marconi transmitted the letter "S" across the Atlantic in 1901, it was in this form
When Marconi transmitted the letter "S" across the Atlantic in 1901, it was in this form
20th CENTURY STUFF
Morse code
20th CENTURY STUFF