Here you will find one or more explanations in English for the word Telegraphy.
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Duplex telegraphyDuplex Du"plex, a. [L., fr. duo two + plicare to fold. See
Two, and Complex.]
Double; twofold.
Duplex escapement, a peculiar kind of watch escapement, in
which the scape-wheel has two sets of teeth. See
Escapement.
Duplex lathe, one for turning off, screwing, and surfacing,
by means of two cutting tools, on opposite sides of the
piece operated upon.
Duplex pumping engine, a steam pump in which two steam
cylinders are placed side by side, one operating the
valves of the other.
Duplex querela [L., double complaint] (Eccl. Law), a
complaint in the nature of an appeal from the ordinary 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. Electro-telegraphy
Electro-telegraphy E*lec`tro-te*leg"ra*phy, n.
The art or science of constructing or using the electric
telegraph; the transmission of messages by means of the
electric telegraph.
Hertzian telegraphyHertzian Hertz"i*an, a.
Of or pert. to the German physicist Heinrich Hertz.
Hertzian telegraphy, telegraphy by means of the Hertzian
waves; wireless telegraphy.
H. waves, electric waves; -- so called because Hertz was
the first to investigate them systematically. His
apparatus consisted essentially in an oscillator for
producing the waves, and a resonator for detecting them.
The waves were found to have the same velocity as light,
and to undergo reflection, refraction, and polarization. PhototelegraphyPhototelegraphy Pho`to*te*leg"ra*phy, n.
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. Radiotelegraphy
Radiotelegraphy Ra`di*o*te*leg"ra*phy, n. [Radio- +
telegraphy.]
Telegraphy using the radiant energy of electrical (Hertzian)
waves; wireless telegraphy; -- the term adopted for use by
the Radiotelegraphic Convention of 1912.
telegraphy or telegraphWireless Wire"less, a.
Having no wire; specif. (Elec.), designating, or pertaining
to, a method of telegraphy, telephony, etc., in which the
messages, etc., are transmitted through space by electric
waves; as, a wireless message.
Wireless telegraphy or telegraph (Elec.), any system of
telegraphy employing no connecting wire or wires between
the transmitting and receiving stations.
Note: Although more or less successful researchers were made
on the subject by Joseph Henry, Hertz, Oliver Lodge,
and others, the first commercially successful system
was that of Guglielmo Marconi, patented in March, 1897.
Marconi employed electric waves of high frequency set
up by an induction coil in an oscillator, these waves
being launched into space through a lofty antenna. The
receiving apparatus consisted of another antenna in
circuit with a coherer and small battery for operating
through a relay the ordinary telegraphic receiver. This
apparatus contains the essential features of all the
systems now in use.
Wireless telephone, an apparatus or contrivance for
wireless telephony.
Wireless telephony, telephony without wires, usually
employing electric waves of high frequency emitted from an
oscillator or generator, as in wireless telegraphy. A
telephone transmitter causes fluctuations in these waves,
it being the fluctuations only which affect the receiver.
Meaning of Telegraphy from wikipedia
-
Telegraphy is the long-distance
transmission of
messages where the
sender uses
symbolic codes,
known to the recipient,
rather than a
physical exchange...
-
Wireless telegraphy or
radiotelegraphy is
transmission of text
messages by
radio waves,
analogous to
electrical telegraphy using cables.
Before about...
- transportation.
Electrical telegraphy can be
considered to be the
first example of
electrical engineering. Text
telegraphy consisted of two or more geographically...
- "in
recognition of
their contributions to the
development of
wireless telegraphy".
Marconi was also an entrepreneur, businessman, and
founder of The Wireless...
-
April 1872
William Henry Ward
received U.S.
patent 126,356 for a
wireless telegraphy system where he
theorized that
convection currents in the
atmosphere could...
- Morse, one of the
early developers of the
system adopted for
electrical telegraphy.
International Morse code
encodes the 26 basic
Latin letters A to Z, one...
- M****
media Mobile phone Smartphone Optical telecommunication Optical telegraphy Pager Photophone Prepaid mobile phone Radio Radiotelephone Satellite communications...
-
Aerial telegraphy may
refer to:
Wigwag (flag signals),
signalling by hand with a
single flag
Optical telegraphy,
chains of
fixed telegraph stations using...
-
submarine communications cables were laid
beginning in the 1850s and
carried telegraphy traffic,
establishing the
first instant telecommunications links between...
- to
wireless telegraphy. The
Wireless Telegraphy Acts are laws
regulating radio communications in the
United Kingdom.
Wireless telegraphy as a concept...
