Don’t try for speed. Accuracy is the most important thing, for unless the letters are accurately made they may be confused and your message will be read as something quite different from what you intended. Fall into a regular easy rhythm. Speed will come with practice. When signalling a message go slowly enough for the receiver to read it.
Semaphore
The “Semaphore” is really a machine, with two arms which may be moved into various positions to indicate letters. It is especially used on railroads. The semaphore code may also be employed by a person using two flags. It is the quickest method of flag signalling but is only available for comparatively short distances, seldom over a mile, unless extra large flags are used, or there are some extraordinary conditions of backgrounds, atmosphere, etcetera.
The semaphore code is not adapted to all sorts of uses as is the general service code, but for very quick communications over short distances it is most useful.
The regulation Semaphore flag is 18 inches square, divided diagonally into two triangles, a red and a white, with the red one fastened to a staff which is 24 inches long. The staff must be carefully held, to move in one piece with the arm, as a “break” at the wrist would make an entirely different angle.
Pass the arms smoothly from one letter to another. Don’t let them “flop” about between letters. Hold each letter long enough so that it is distinct. At the end of a word make “Interval” hands crossed downward in front of body, right over left. Indicate the end of the sentence by one “chop-chop”—made by placing both arms at the right, horizontal, and moving them up and down in cutting motion. Indicate end of the message by three “chop-chops.” While signalling maintain fixed position, head upright.
Be accurate in making the letters. It is the angle between your arms that counts. Speed will soon come with practice. Don’t look in a mirror, or you will get it all backwards.
Signalling with a Lantern
The motions used in signalling with a lantern are very like those with the single flag. For Position, hold a lantern directly in front of you; for a dot swing it to the right and back; for a dash swing it to the left and back; and for Front move it up and down in a vertical line, directly in front of you. You should have a stationary light, in front of your feet, as a point of reference for the various motions.