The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 260
^ff^^^^«-^ I^iff. 171. Experiment Showing LinesOF Force Surrounding an ActiveConductor. … Fig. 172. Diagram of FieldOF Force Surrounding anActive Conductor. The existence of the field is easily shown by passing a conductorvertically through a horizontal card. On causing a current to gothrough the wire the field is formed, and iron filings dropped uponthe card, tend, when the latter is…
Electricity
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