Invisible ink makes an appearance in the complaint as does Morse code, which, of course, is pretty uncrackable.
Delaney opened the door after a repeated knock in Morse code.
"You never can tell who knows the Morse code and who doesn't," Gilbert said.
A red light indicates a dot in the Morse code and a white light indicates a dash.
There came again the faint tapping of some one at the other end of the line, signaling a message in the Morse code.
Inasmuch as there are no letters in the Chinese language, the difficulties in using the Morse code of telegraphy are very great.
The alphabet of signals employed is the 'Morse code,' so generally in vogue throughout the world.
I guess he went on kind of crazy, but he said he was sure because he knew the Morse code.
He walked in dots and dashes like a Morse code out of the room, bestowing a naval salute on the Major as he passed.
The signals were the short and long, or 'dots' and 'dashes' of the Morse code.
1867, earlier Morse key (1858), in honor of Samuel F.B. Morse (1791-1872), U.S. inventor who produced a system of telegraphic communication 1836. He invented both the recording telegraph and the alphabet of dots and dashes.
|Morse code |
A code developed by Samuel Morse used for transmitting messages in which letters of the alphabet and numbers are represented by various sequences of written dots and dashes, or short and long signals such as electric tones or voltages. Morse code was used extensively in telegraphy. In a format that has been standardized for international use, it is still sometimes used for long distance radio communication.