The tone of discussion was much lower than at Mr. Morse's table. The men were not grave and dignified.

Corresponding messages went out in Morse code and required keys, which changed daily, to decipher -- get it?

On this occasion, Scientific American reports, Morse signed his name along with the appendage, "One of the few immortal names/ That are not born to die.

Those not conversant in Sign may suppose that it's an invented form of communication like Esperanto or Morse code.

A call to the Science Museum confirmed that it still retained Morse's Graphophone equipment.