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Syphon recorder
The syphon or siphon recorder is an item of telecommunications equipment invented by William Thomson, 1st Baron Kelvin in 1858. It was used to automatically record the receipt of a telegraph message, as a wiggling ink line on a roll of paper tape. Little skill was required to record the message, but a trained telegrapher was still required to read and understand it.
In many ways, it anticipated the modern inkjet printer though it seldom operated reliably.
== Principle ==
The principle behind the siphon recorder is the inverse of the mirror galvanometer. In the mirror galvanometer, a small magnet, which is free to rotate round its own axis, is suspended in the centre of a large coil of wire. In the siphon recorder, a small coil is suspended between the poles of a large magnet. When a current passes through the coil, the interaction between the electric and magnetic fields produces a mechanical force on it dependent on the electric current. The ink siphon is attached to the coil, and therefore the position at which ink is distributed on the paper varies accordingly. In order not to affect the motion of the coil, the siphon itself never touches the paper.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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