单词 | magnetic telegraph |
释义 | > as lemmasmagnetic telegraph a. A device or system for transmitting (and receiving) messages one character at a time over a distance by means of electrical signals carried over a wire or (in later use) by radio waves, esp. one in which the signals are created by making and breaking an electrical circuit, causing movements of a needle or pointer in the receiver. More fully (esp. in early use) electric telegraph, magnetic telegraph. Now chiefly historical.The most widely used device of this kind employed Morse code to represent characters audibly or visually. Other forms of receiver pointed to characters upon a dial, printed or traced the message upon a prepared strip of paper, etc. [In electrical telegraph (see quot. 1797) after Spanish telégrafo eléctrico (1795 in a memoir by F. Salva i Campillo, the source referred to in the quot.).] dial telegraph, needle telegraph, printing telegraph, etc.: see first element. See also radio-telegraph n., wireless telegraph n. ΘΚΠ society > communication > telecommunication > telegraphy or telephony > telegraphy > telegraph > [noun] telly1796 telegraph1797 telelectrograph1857 thought-conductor1889 magneto-telegraph1890 set?1891 1797 Monthly Mag. Feb. 148/1 Dr. Don Francis[c]o Salva had read, at the Royal Academy of Sciences, at Barcelona, a Memoir on the Application of Electricity to the Telegraph, and presented..an Electrical Telegraph of his own invention. 1823 F. Ronalds Descr. Electr. Telegr. 5 This set of experiments appeared to afford no grounds for abandoning the project of an electric telegraph. 1845 P. Hawker Diary (1893) II. 264 I saw the magnetic telegraph at the railway station. 1881 W. McK. Springer in N. Amer. Rev. Apr. 369 In the brief space of thirty years the telegraphs of the world have grown to nearly half a million miles of line, and more than a million miles of wire. 1896 Yorks. Herald 26 Dec. 3/6 Signor Guglielmo Marconi has devised a telegraph in which he utilises such ‘electrostatic waves’. 1926 T. E. Lawrence Seven Pillars (subscribers' ed.) cxi. 590 Young and I cut the telegraph, here an important network of trunk and local lines. 1985 J. A. Michener Texas xi. 797 Emma Rusk, safe in her little town four hundred miles northwest of Indianola, heard of the disaster by telegraph one day after it happened. 2006 V. Smil Transforming 20th Cent. vii. 308 Both telegraph and radio were initially expected to reduce or eliminate conflicts as they promoted better communication. < as lemmas |
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