(d) By hand flags or by stationary semaphore. (Two-arm semaphore Code.)
(e) By preconcerted signals with Coston lights, rockets, bombs, Very pistols, small arms, guns, etc.
(f) By flag signals by permanent hoists. (International Code.)
22. The following conventional signals, with exceptions noted, will be used in the first four classes.
| Exceptions. Ardois and semaphore. | ||
| End of word. | Interval. | |
| End of sentence. | Double interval. | |
| End of message. | Triple interval. | |
| Signal separating preamble from address; address from text; text from signature. | — · · · — | Double interval, signature preceded also by "Sig" interval. |
| Acknowledgement. | R. | |
| Error. | · · · · · · · · | A. |
| Negative. | K. | |
| Preparatory. | L. | |
| Annulling. | N. | |
| Affirmative. | P. | |
| Interrogatory. | · · — — · · | O. |
| Repeat after word. | Interrogatory. A (word). | |
| Repeat last message. | Interrogatory three times. | |
| Send faster. | QRQ | |
| Send slower. | QRS | |
| Cease sending. | QRT | |
| Wait a moment. | · — · · · | None. |
| Execute. | IX, IX | |
| Move to your right. | MR | |
| Move to your left. | ML | |
| Move up. | MU | |
| Move down. | MD | |
| Finished (end of work). | · · · — · — | None. |
Visual Signaling: By Flag (Wig-Wag), Torch, Hand Lantern, or Beam or Searchlight (Without Shutter).
GENERAL SERVICE CODE.
23. For the flag used with the General Service Code there are three motions and one position. The position is with the flag held vertically, the signalman facing directly toward the station with which it is desired to communicate. The first motion (the dot) is to the right of the sender, and will embrace an arc of 90°, starting with the vertical and returning to it, and will be made in a plane at right-angles to the line connecting the two stations. The second motion (the dash) is a similar motion to the left of the sender. The third motion (front) is downward directly in front of the sender and instantly returned upward to the first position. Front is used to indicate an interval.
24. The beam of the searchlight, though ordinarily used with the shutter like the heliograph, may be used for long-distance signaling, when no shutter is suitable or available, in a similar manner to the flag or torch, the first position being a vertical one. A movement of the beam 90° to the right of the sender indicates a dot, a similar movement to the left indicates a dash; the beam is lowered vertically for front.
25. To use the torch or hand lantern, a footlight must be employed as a point of reference to the motion. The lantern is most conveniently swung out upward to the right of the footlight for a dot, to the left for a dash, and raised vertically for front.