The International Morse or General Service Code.
18. The International Morse Code is the General Service Code and is prescribed for use by the Army of the United States and between the Army and the Navy of the United States. It will be used on radio systems, submarine cables using siphon recorders, and with the heliograph, flash-lantern, and all visual signaling apparatus using the wigwag.
Alphabet.
| A . - | N - . |
| B - . . . | O - - - |
| C - . - . | P . - - . |
| D - . . | Q - - . - |
| E . | R . - . |
| F . . - . | S . . . |
| G - - . | T - |
| H . . . . | U . . - |
| I . . | V . . . - |
| J . - - - | W . - - |
| K - . - | X - . . - |
| L . - . . | Y - . - - |
| M - - | Z - - . . |
Numerals.
| 1 . - - - - | 6 - . . . . |
| 2 . . - - - | 7 - - . . . |
| 3 . . . - - | 8 - - - . . |
| 4 . . . . - | 9 - - - - . |
| 5 . . . . . | 0 - - - - - |
Punctuation.
| Period | . . . . . . |
| Comma | . - . - . - |
| Interrogation | . . - - . . |
| Hyphen or dash | - . . . . - |
| Parentheses (before and after the words) | - . - - . - |
| Quotation mark (beginning and ending) | . - . . - . |
| Exclamation | - - . . - |
| Apostrophe | . - - - - . |
| Semicolon | - . - . - . |
| Colon | - - - . . . |
| Bar indicating fraction | - . . - . |
| Underline (before and after the word or words it is wished to underline) | . . - - . - |
| Double dash (between preamble and address, between address and body of message, between body of message and signature, and immediately before a fraction) | - . . . - |
| Cross | . - . - . |