. An elementary manual of radiotelegraphy and radiotelephony for students and operators . the niethdtls t-niiiloyed for generatingelectromagnetic waves and radiating as well as detecting them atdistant places, we have next to consider the combination of theseprocesses into a practically operative system of radiotelegraphy. To convey information to a distance we must be able toproduce at the receiving station at pleasure certain visible oraudible signals signifying letters, words, or ideas. For thispurpose the most commonly used code is the International systemof Morse signals, according to whi
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . the niethdtls t-niiiloyed for generatingelectromagnetic waves and radiating as well as detecting them atdistant places, we have next to consider the combination of theseprocesses into a practically operative system of radiotelegraphy. To convey information to a distance we must be able toproduce at the receiving station at pleasure certain visible oraudible signals signifying letters, words, or ideas. For thispurpose the most commonly used code is the International systemof Morse signals, according to which each letter of the alphabet isdenoted by a collocation of elementary signals of two kinds, oneof short length or duration, called a dot, and the other of threetimes the length or duration, called a dash. Groups of these dotsand dashes are made to succeed each other, with an interval equalto the length or duration of a dot between them, to form thevarious letters or numerals. Thus, the International Morse Codeusually employed is as follows:— THE ALPHABET. A I B C D E , F G H JKL M. 234 ^A DIO TELEGRA PH V THE NUMERALS. Full stop ■■ ■■ — Understand — » « ^^ « Repeat •■ i« ^^ ^— ■• — Call Signal » -• — a-i^ If, then, we have the means of marking upon paper a collectionof these signs or making them audible as short and long soundsin a telephone, we can signal out letters, and, therefore, space equal to a dash is left between letters and a longer spacebetween words. In the case of non-alphabetic languages, like Chinese andJapanese, the ideographs are numbered, and the numbers trans-mitted and translated. If the Morse characters can be printed onpaper strip as received, we have a permanent record. If they arereceived by telephonic sounds, the observer translates them men-tally, and writes down the letter on paper as received. Accordingly,the broad principles of all radiotelegraphy are as follows:— At one place, called the transmitting s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
