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  • Insulator (electrical) — Ceramic insulator at railways Conducting copper wire insulate …   Wikipedia

  • Coaxial cable — RG 59 flexible coaxial cable composed of: A: outer plastic sheath B: woven copper shield C: inner dielectric insulator D: copper core Coaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by …   Wikipedia

  • Strain insulator — A strain insulator is an insulator that provides both large electrical insulation and a large load bearing capacity. Strain insulators were first used in telegraph systems to isolate the signal wire from ground while still supporting the wire.… …   Wikipedia

  • Submarine communications cable — A cross section of a submarine communications cable. 1 Polyethylene 2 Mylar tape 3 Stranded steel wires 4 Aluminium water barrier 5 Polycarbonate 6 Copper or aluminium tube 7 Petroleum jelly 8 Optical fib …   Wikipedia

  • Copper wire and cable — Copper has been used in electric wiring since the invention of the electromagnet and the telegraph in the 1820s.[1][2] The invention of the telephone in 1876 proved to be another early boon for copper wire.[3] Today, despite competition from… …   Wikipedia

  • coaxial cable — Elect. a cable that consists of an insulated conducting tube through which a central, insulated conductor runs, used for transmitting high frequency telephone, telegraph, digital, or television signals. Also called coax. [1935 40] * * * or coax… …   Universalium

  • Transatlantic telegraph cable — The first transatlantic telegraph cable crossed the Atlantic Ocean from Foilhommerum, Valentia Island, in western Ireland to Heart s Content, in eastern Newfoundland. The transatlantic cable bridged North America and Europe, and expedited… …   Wikipedia

  • Loading coil — In electronics, a loading coil or load coil is a coil (inductor) that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance. The need was discovered by Oliver Heaviside in studying the… …   Wikipedia

  • Overhead power line — This article is about power lines for general transmission of electrical power. For overhead lines used to power road and rail vehicles, see Overhead lines. Transmission lines in Lund, Sweden …   Wikipedia

  • telecommunications media — Introduction       equipment and systems metal wire, terrestrial and satellite radio, and optical fibre employed in the transmission of electromagnetic signals. Transmission media and the problem of signal degradation       Every… …   Universalium

  • building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

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