Night Signalling
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By K. Graham Thomson SAMUEL FINLEY BREESE MORSE was the resounding full name of the American artist and inventor of the first practical electric telegraph instrument. His surname is preserved for all time as the name of the signaling code by means of which letters of the alphabet and figures can be transmitted from one place to another-visually by means of flag, lamp, flare and smoke, disc and shutter, mirror and heliograph; audibly by cable or wireless. As a matter of fact, the International Code, now almost universally used, differs quite a lot from the original Morse Code, although we call the code we use after Morse. In Morse's own code, for example, the sign for F was the one we now use for R. He used spaces or intervals between the dots and dashes composing a letter, to make different signs ; this was rather confusing, and prevented fast signaling, so spaces within letters were abolished in the revised International Code now adopted. Morse died in New York in 1872 ; there is a big bronze statue of him in Central Park. Signaling is jolly good fun, and good training for your mind and your body too. It is extra good fun signaling at night, but it is most important to grasp two points first.
One is that you must be absolutely perfect in your knowledge of the code, and the special station signals and abbreviations. The second is that there must be good discipline-extra good-while signaling games or practices are on. Nothing is so exasperating or so wrecking as slackness, idleness, or inattention at the opposite " station," causing your signals to be ignored or replies delayed. So now, if you are a hundred per cent perfect in the Morse Code, sally forth at night with signaling lamps and do a spot of practice. It does not much matter what apparatus you use, so long as you preserve good discipline in each station, and do not allow any shouting or running across between stations when you get a word you cannot understand. The Chief Scout says " Every Scout ought to learn the Morse method of signaling," and you can make good use of it at night. It is as well to begin practicing lamp signaling in your clubroom with an ordinary flash-lamp, or the cheap Mazda lamps mentioned.If you are one of the lucky folk who have a clubroom with several rooms in it, you can have some fun if you rig up a lamp signaling installation with wires to all rooms, so that you can send lamp messages from one room to another with the doors shut. Each Patrol can have its special code sign, and the SM can send messages from his den to any particular Patrol without the others being disturbed, once they have seen that the message is not prefixed by their code sign. Long-Range WorkLong-distance signaling at night with lamps is not at all easy. Such lamps are of two kinds : those where the light is on all the time, and signals are made by moving a shutter in front of the light; and those in which the light itself is flashed on and off. Both sorts are worked by a key or tapper, with which Morse Code signals are made. Lamps for long-range work usually have a sight of some kind fitted to them, generally a little tube with crossed wires at the outer end of it, so that the lamp can be sighted accurately on the other station. The exact alignment of the lamp is necessary to get good results. Two " station signals " are used to get accurate alignment. One is the letter W, which is sent to call the attention of the other station to the fact that there is something wrong with their light, and the lamp should be adjusted. The other station signal is OL, which means "open your light and leave it shining, so that I can align my lamp on your station." Prompt attention must be given to either of these signals, because they indicate that the station sending them cannot receive what is being sent. Another method of light signaling which you may like to try on a bright night when there is a full moon, is to use mirrors or a heliograph reflecting the moonlight. Try at short range first with a mirror, focusing the light from it on to the other station and moving a sheet of cardboard in front of it to make Morse Code letters. The great point about sending Morse with lamps at night is to send very slowly, but to preserve the proper proportion between dot and dash; the dash must always be three times as long as a dot. Take great care not to clip the dots, or send them too short ; if you do, they will not be observed at the receiving end. Send longish dots, and make the dashes three times as long. Flare Signals In Scouting for Boys the Chief describes another method of signaling with light at night ; flare signals. Enemy Airships
Chapter X Night Stalking |
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Last modified: October 15, 2016.