Signal

“ When a number of stations are in view from one station and it is desired to send a message to all or more than one station, some preconcerted signal, as a rocket, a red light, or some peculiar flag or torch signal, should be designated as a signal for general attention. ”

“ Short waves, long waves, micro-waves, frequency-modulated waves, amplitude-modulated signals, every conceivable type of radiation signal, was beamed at the small, invisible, hurtling objects as they swung madly about the globe. ”

“ Strictly speaking, a visual signal is any visible sign by which intelligence is communicated, but in a military sense the term visual signaling has a broader meaning and includes other methods of transmitting information than those which appeal to the sense of sight. ”

“ Wonder how a signalman can by any means contrive to keep a cool head on his shoulders, while working as one sees him in a signal-box of glass, and the temperature of the tropics.
Wonder if upon an average there are three men in a thousand who have never been puzzled by the hieroglyphics in Bradshaw. ”

“ These meanings usually include the letters of the alphabet and numerals, combinations of which being used to formulate necessary information. Combinations of elements of any system can also, however, be used to indicate any desired meaning.
With reference to period of visibility, signals are of two kinds, transient and permanent. A transient signal is one which disappears as soon as completed; [11] a permanent signal is one that remains in view for some time. Heliograph signals are transient signals, while signals made by code flags are permanent signals. ”

“ The sun was not yet quite down when I traversed the field-path near the top of the deep cutting. I would extend my walk for an hour, I said to myself, half an hour on and half an hour back, and it would then be time to go to my signal-man’s box.
Before pursuing my stroll, I stepped to the brink, and mechanically looked down, from the point from which I had first seen him. I cannot describe the thrill that seized upon me, when, close at the mouth of the tunnel, I saw the appearance of a man, with his left sleeve across his eyes, passionately waving his right arm. ”

“ The Chief Signal Officer has charge of the system of communicating with distant points by means of various systems of signals, the most noteworthy of which is that of the heliograph, by which information is conveyed by the use of sun-reflecting mirrors. ”

“ Macpherson. "Let the safety signal be of one uniform shape, and small; let the red, or danger signal, be of as different a shape as can be made, and large; so different that it could never fail to catch the eye. For, look you, a head deficient in the organ of colour will usually have that of form very much developed: and if a driver could not see the light, he might the form: and so save his train." ”

“ Repeat the signal A ._ Orange, Plank. Do this a few times till all pictures are clear and come quickly.
Let all your alphabetical practice be by seeing the picture and speaking the signal. Thus, A, see the picture and speak the signal, Dot, Dash.
See to it that most of your practice is from signal to letter. This is "receiving" and requires the most practice.
In your odd moments go over signals, thus, _ _._ two bats, an apple and a bat (wrapped in a Quilt) Q.
._ _ an orange and two planks (the Wolf walks over) W.
Pictures insure accuracy, depend upon the picture. ”

“ The signal experiment is duplicated thousands of times in the education of every human being. He learns the meaning of signs and slight indications; that is, he learns to recognize important facts by aid of signs that are of themselves unimportant. We shall have much to say on this matter in a later chapter on perception. Man learns signs more readily than such an animal as the rat, in part because the human being is naturally more responsive to visual and auditory stimuli. Yet the human being often has trouble in learning to read the signs aright. ”

“ When there is a dot at the end of the arm it represents the cap of the signal-man. You see, then, that a man on one side a river might, by making one letter at a time, communicate what word he pleased to a man on the other side of the river, who might signalize it to another in the same way, and so on to any distance required. ”

“ It will be found convenient to have an answering signal from the receiving end of the line to each word separately. This must be sent in the pause after each word, and consists of the short signal E – when the word is understood, or the double short signal I – – when the word is not understood. ”

“ In most systems of signals suitable for military use, each signal is composed of one or more separate units, known as elements. Having prescribed a certain number of elements, the various signals are formed by having these elements appear singly or together in different arrangements or combinations. The continental system is one of two elements, namely the dot and the dash, while the Morse system employs three elements, the dot, the dash, and the space. Having agreed upon a certain number of combinations of elements, a system of signals is formed by giving a meaning to each combination. ”

“ Regarding a printed notice on the wall that strangers are particularly requested not to distract the attention of the signal-man from his duties, we take a look round, and the general impression to be got from a cursory glance is that it must be rather jolly to be a signal-man. ”

“ E. Price-Edwards recently delivered before the Society of Arts a valuable lecture on "Signaling by Means of Sound," in which he considered the requisites of a good signal, and discussed the merits of the different signals in use. The essential quality of a good sound signal is that it shall give a strong sound which can be uniformly heard at a definite distance. The range of a sound is determined by the force with which it is uttered, and is modified by certain conditions of the atmosphere. ”

“ The person who makes the signals must stand on one side in front of the instrument; and, by passing his hat slowly before the aperture any number of times, may thus express each unit's figure of his signal. ”

“ After transmitted sound the next thing is the visible signal, and this has been employed by human beings from the earliest ages in transmitting information to a distance. It is a method which will perhaps never be wholly abandoned. Observe the surveyors running a trial line. Far off is the chain bearer and here is the theodolite. The man with the standard watches for the signal of the man with the instrument. ”

“ The signal-man is able to survey the lines all round him by the aid of his electric signals; he can talk by telegraph or telephone to his neighbors and his station-master; he learns of the motion of the trains he is marshaling by the different sounds of electric bells; he controls his out-door signals by the deflection of needles or the movement of miniature semaphores; he learns the true working of his distant signals by their electric repetition; machinery governs and locks every motion that he makes, so that he can not make a mistake. ”

“ In such observations (which must not be confounded with those where the two signals were identical and their successiveness known as mere doubleness, without distinction of which came first) , it is obvious that each signal must combine stably in our perception with a different instant of time. It is the simplest possible case of two discrepant concepts simultaneously occupying the mind. ”

“ But this is what you think, and not what you have figured out, for if you have eight flags of different colors and display them, four at a time, on the signal halyard you can make the surprising number of 1680 permutations; and this, you will allow, is enough to say anything that you may have to say.
Although a code book is found in every signalman’s outfit, he is a chap who knows all the signals by heart and can send and receive flag messages almost as fast as you can write down the words. ”

“ It has become necessary, therefore, to rely upon small electrical instruments, miniatures of the out-door semaphores, which direct the signal-man in the box how to exhibit his out-door signals by displaying the signals which they themselves ought to give. ”

“ We generate a signal, vary the frequency until I lose my mutant powers—and that's it! We generate as strong a signal as we can. Then we have every transmitter in the country put on a direct line to us. When the radar spots the first saucer, we let go with every kilowatt of power we've got. ”

“ Just consider for a minute the position of an engine-driver with an express train, timed to run at fifty miles an hour without stopping! how many distant signals he has to pass in that distance which he never catches the least glimpse of whatever! and how many times he has to trust to chance, sooner than lose time! ”

“ I may here remark that men are sometimes appointed to the position of signal-inspectors who have never done one hour’s duty in charge of a signal-box in their lives. Just fancy an official of this kind being entrusted with the very important duty of seeing that signalmen thoroughly understand all the important points connected with their duties that I have named! ”

“ There is scarcely any commercial industry whose successful existence does not vitally depend upon some one, perhaps several systems of signaling, and improvements of old and inventions of new signal devices are continually necessary to meet the requisite needs demanded by the progress of art and science. Railways are probably the greatest of all commercial users of signals. With them the great mass of intelligence is transmitted by the electric telegraph and telephone, but the flag, the semaphore, the signal light, and many other contrivances furnish indispensable visual adjuncts. ”

“ Signals may be executed, first, exclusively by bodily action; second, by action of the person in connection with objects, such as a blanket, or a lance, or the direction imparted to a horse; third, by various devices, such as smoke, fire or dust, when the person of the signalist is not visible. When not simply intended to attract attention they are generally conventional, and while their study has not the same kind of importance as that of gesture signs, it possesses some peculiar interest. ”

“ As soon as possible after a fog comes on, a man is stationed at the foot of each distant signal, and generally of each home signal also, who by means of detonators, red and green flags and a hand-lamp, conveys information to the driver of every train as to the position of the semaphore arm. ”

“ While, in consequence of the development of electrical invention and improvement, visual signaling will be less frequently resorted to in future than heretofore in the service of field lines of information, it should be appreciated that the necessity for an adequate supply of apparatus of this kind, and the need for skilled manipulators to operate it, has in no wise diminished. ”

“ The greater the fires, the greater were the vibrations and consequently they carried farther to the receiver, which was the eye. If a signal is to be sent a great distance by light the source of that light must be correspondingly powerful in order to disturb the ether sufficiently. ”

“ If danger to yourself, and you need assistance, you hold up the signal and let the smoke ascend, at short intervals. If you wish some one to approach you move it backwards. If you wish only to signal your own approach you move it forward, and so on through a long list of signs. ”

“ When recourse to any method of sight signals can not be had on account of weather conditions or lack of suitable apparatus, sound signals may often be advantageously used. The commoner means of furnishing sound signals are the horn and the whistle, though many other kinds of apparatus are practicable. The necessary elements of any system can be indicated by one short, two shorts, and a long blast. ”

“ Every engineer should, as far as possible, not only see that each signal is off, but he should also cast his eye over the [Pg 56] road in front of him to see whether it should be off. At night caution in the matter of signals is even more necessary than in daylight. ”

“ The receiving instrument connected to the line instead of being made heavy enough to give an audible sound by which the signal may be understood, is made extremely light and delicate so that it can be operated by a weak current. ”

“ The correct determination of background color from the vicinity of home stations is usually difficult and unsatisfactory, and it is considered the best method to establish communication with the distant station by simultaneously using several kinds of signaling apparatus, that kind producing the most intelligible signals being retained for continued use. ”

“ To find a signalman near any known station, note with the unaided eye some prominent landmark near which the looked-for person or object is supposed to be, and direct the telescope upon the place, as sight is taken over a gun barrel, covering the object; if the eye is now placed at the eyeglass of the telescope, the prominent or directing landmark will be found in the field of view. ”

“ A telegraphic message travels with the speed of light, for the speed of electricity and the speed of light are the same. A telegraphic signal would go more than seven times around the earth in one second if it travelled on one continuous wire. ”

“ When, however, the distance would be too great for conversation, or the wind would be in the wrong direction, a few signals were used that could be distinguished a great way off. The signal to "come here" is given by standing with your face toward the party with whom you desire to communicate and then raising your right arm to the right and moving it up and down like a pump handle. The effect can be increased by holding a gun or your hat or anything that can be seen at a greater distance in the moving hand. ”

“ If you used a focused signal, you’re going to have to be perfectly aligned if you’re going to talk back to your base, so unless you want to provide a connection to one tiny pinpoint somewhere a couple kilometers away, it won’t do you any good. ”