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Communication at a distance by means of code signals consisting of current pulses sent over wires or by radio.



the branch of science and technology that studies the principles of establishing telegraph communication, develops methods for transmitting telegraph signals and the equipment required by these methods, and evaluates the quality of data transmission over telegraph channels.

As a scientific and technical discipline, telegraphy is divided into the following branches, corresponding to the principal areas of interest: telegraph codes, dealing with the optimum conversion of alphameric data into combinations of electrical signals during transmission and the reciprocal conversion of the signals upon reception; terminal equipment, dealing with design principles for telegraph equipment, transmitters and reperforators, methods of signal transmission and reception, and the development of electronic equipment; telegraph channels, dealing with the most economic use of expensive wire communications and the design of channels with specific characteristics; and telegraph networks, dealing with the choice of methods for connecting subscribers and terminal points, the most advantageous distribution of stations, and the quality of subscriber services.

In order to ensure high-quality transmission in telegraphy, studies are being conducted on signal distortions, the causes and laws governing these distortions, and errors that occur during data transmission and methods of eliminating such errors.

Unlike other forms of communication, telegraphy operates with discrete messages composed of a finite number of symbols—letters, numbers, and punctuation marks. The signals that transmit these messages are also discrete. The theoretical basis of telegraphy is the general theory of communications, information theory, and the theory of potential noise immunity. Probability theory and Boolean algebra also find application in telegraphy.

Phototelegraphy is a special branch of telegraphy and has historically been included in the discipline. It studies the principles of facsimile.

References in periodicals archive ?
MPE, Maladies a Potentiel Epidemique (case-based surveillance); NA, not available; TLOH, Telegramme Lettre Official Hebdomadaire (aggregate case counts).
La sequence du telegramme entre le facteur et Magdalena trouve son double dans la sequence de la valise entre le meme facteur et Maria, la fille de Magdalena.
Sarkozy suggere a Reding de les accueillir au Luxembourg", Le Telegramme de Brest, 15 September 2010, (http://www.
L'assemblee vota des resolutions que Bruchesi envoya au secretaire d'etat, le cardinal Merry del Val, qui remercia par telegramme.
Jusqu'en 1982, la famille n'eut plus aucunes nouvelles, en decembre, la famille recu un telegramme annoncant la mort d'Elena dans un affrontement en 1977.
When Bulgaria and Romania enter Schengen, that will mean that their borders become our borders," said Wauquiez in an interview for Tuesday's edition of French paper Le Telegramme de Brest.
Telegramme rug, pounds 399 from Habitat adds a wild element to your floor.
Public Invite, Interview, Government Relation or trade association officials, Strategy Ceremony, banquet and meeting, Cut ribbon, Present gift, Congratulatory signature, photo, telegramme or speech.
Inside, The Idyls, Telegramme, LP45 and The October Game, from London, will play.
Die volgende aand het die Kommuniste in die agterbuurt aan die onderpunt van 'n doodloopstraat byeengekom: van die platform af het hulle aangehou lees uit telegramme, en almal het die Internationale gesing; toe't hulle 'n bietjie gepraat, en toe't nog 'n telegram daar aangekom Hulle was arm en gekwel en luidrugtig; mens het gewonder hoe dit moontlik was dat hulle soveel goeie nuus kon kry wat geen verskil hoegenaamd gemaak het nie.
But when the telegramme announcing date and time for the rendez-vous was placed at the Casablanca post office, a French secret serviceman came up a few minutes later in German accent and said he had the wrong date--it should be put down as ten days later.