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cience or art of constructing, or of communicating by means of, telegraphs; as, submarine telegraphy.

The art or science of constructing or using the electric telegraph; the transmission of messages by means of the electric telegraph.

Telegraphy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography. -- Pho`to*tel"e*graph (#), n. --Pho`to*tel`e*graph"ic (#), a.

Telegraphy using the radiant energy of electrical (Hertzian) waves; wireless telegraphy; -- the term adopted for use by the Radiotelegraphic Convention of 1912.

In fire-alarm telegraphy, a system so arranged that when one alarm is being transmitted, no other alarm, sent in from another point, will be transmitted until after the first alarm has been disposed of.

er, a condition easily destroyed by tapping. A common form of coherer as used in wireless telegraphy consists of a tube containing filings (usually a pinch of nickel and silver filings in equal parts) between terminal wires or plugs (called conductor plugs).

determining the frequency of electic wave oscillations, esp. in connection with wireless telegraphy.

nary to his immediate superior, as from a bishop to an archbishop. Mozley & W. -- Duplex telegraphy, a system of telegraphy for sending two messages over the same wire simultaneously. -- Duplex watch, one with a duplex escapement.

, the product closely resembling rubber; -- used principally as an insulating material in telegraphy. Knight.

The acquisition of knowledge or skill; as, the learning of languages; the learning of telegraphy.

t thunder, seen near the horizon, esp. at the close of a hot day. -- Lightning arrester (Telegraphy), a device, at the place where a wire enters a building, for preventing injury by lightning to an operator or instrument. It consists of a short circuit to the ground interrupted by a thin nonconductor over which lightn…

Designating, or pert. to, Marconi's system of wireless telegraphy; as, Marconi aërial, coherer, station, system, etc.

A system or wireless telegraphy developed by G. Marconi, an Italian physicist, in which Hertzian waves are used in transmission and a coherer is used as the receiving instrument.

The apparatus used in Marconi wireless telegraphy.

ic oscillations; esp., an apparatus for generating electric waves in a system of wireless telegraphy.

Of or pertaining to radiotelegraphy; employing, or used or employed in, radiotelegraphy.

One who, or that which; sounds; specifically, an instrument used in telegraphy in place of a register, the communications being read by sound.

Of or pert. to syntony; specif., designating, or pert. to, a system of wireless telegraphy in which the transmitting and receiving apparatus are in syntony with, and only with, one another. -- Syn*ton"ic*al (#), a. --Syn*ton"ic*al*ly, adv.

ain wave length; to tune; specif., to put (two or more instruments or systems of wireless telegraphy) in syntony with each other. -- Syn`to*ni*za"tion (#), n.

th a pair of adjustable spark balls, for attuning the time periods of antennæ in wireless telegraphy (called also syntonizing coil).