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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 ?
Qatar Airways is also interested in taking a stake in Air-France-KLM, but for now has been kept on the sidelines, De Telegraf said.
CCI Europe, Aarhus, Denmark, supplied a NewsDesk editorial system to Amsterdam-based De Telegraf, the Netherlands' largest daily, with weekday circulation exceeding 750,000.
In mid-October 1998, Slavko Curuvija, editor and publisher of the now silent Dnevni Telegraf, co-authored an open letter to Yugoslav President Slobodan Milosevic that criticized the crackdown on the media and promoted the inclusion of "minorities in the highest political institutions.
for finding nothing of note in the Cossack chronicles of the eighteenth century or the Istoriia Rusov, for eschewing Volodymyr Antonovych despite the fact that his 'Otzyv iz Kieva' of 1862 is short, trenchant, and eminently translatable, and for apparently finding none of Drahomanov's articles in Kievskii telegraf for the first half of 1875 or the 200 pages of documents at the back of Savchenko's Zaborona ukrainstva 1876r.
Izobrazhenie vselennoy po indiyskim ponyatiyam"/Representation of the Universe according to the Indian Concepts/, Moskovskiy telegraf, 1832, vol.
Slavko Curuvija owner of the Belgrade Dnevni Telegraf newspaper, was shot dead by gunmen at his Belgrade apartment, Mr Robertson said.
Lastly, Amsterdam's De Telegraf proclaimed Cavalia as "A fairytale for the entire family
Former MP Naser Ziberi, in an interview for Radio Free Europe, said that Albanian parties signed and presented the Platform in a wrong manner and in the wrong time, and according to him, they allowed President Gjorge Ivanov and VMRO-DPMNE to present an alibi and hold onto the last straw and save condemn the conditions listed in the Platform, reports Telegraf Makedonija.
The amount of the Eurobond is not revealed for now yet Gruevski reiterated what he has recently said in his mega interview with Telegraf.
The international press freedom organization is also warning of a harassment campaign against being led by several of media outlets in Bulgaria, namely "the daily newspapers Monitor and Telegraf, the weekly Politika, and Kanal 3 television", which are part of the media group of controversial MP Delyan Peevski and his mother, Irena Krasteva.
90) Supporters of Chubinskii and Dragomanov, who had assumed editorial control of the daily Kievskii telegraf, used the paper to refute charges that their activities were in any way subversive, pointing out that "Little Russian patriots" had long been conducting their activities on a legal basis with the full knowledge and support of the authorities.