Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 229
s of a powerful steel magnet M.When this coil is traversed by the cable current, it turnsin the magnetic field, to the right or left, according to thedirection of the current, rotating the siphon slightly onits wire axis, against the torsion of the wire, and causing itspoint to oscillate across a… … Fig. 92. The point of the siphon, when at rest, is held exactlyover the center of the paper strip ; being adjusted to thatposition by two soft iron armatures, which are slid to theright or left as required, on the poles of the magnet, andcontrol two similar armatures attached to the vertical…
Electricity
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