Earth-return telegraph
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Earth-return telegraph is the system whereby the return path for the electric current of a telegraph circuit is provided by connection to the earth through an earth electrode. Using earth return saves
Part of the Russian–American Telegraph line bearing the single wire of an earth-return circuit, c. 1866
A disused pole of the Australian Overland Telegraph Line which used to carry four lines using an earth-return
William Watson established the viability of earth return
Carl August von Steinheil was the first to put an earth-return telegraph into service
Unbalanced line
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In telecommunications and electrical engineering in general, an unbalanced line is a pair of conductors intended to carry electrical signals, which have unequal impedances along their lengths and to g
Earth-return telegraph
…early telegraph systems which often required multiple signal wires. All of the circuits in such a system could use the same single return conductor (unbalanced lines), so the cost saving would have been minimal. Examples of multiwire systems included Pavel Schilling's experimental system in 1832, which had six signal…
A multicore cable able to support 25 unbalanced transmission lines
Telegraph lines on an Oppenheimer pole outside the historic Alice Springs telegraph station on the now disused Australian Overland Telegraph Line
Coaxial cable
Microstrip parallel-coupled transmission lines. The design forms a band-pass filter