Lodge, Oliver, Sir, 1851-1940 · London, New York, Macmillan and co. · leaf 190
e or less between its faces. But according to Amperes theory of molecular cur-rents there is no essential difference between such a CHAP. IX.] STRUCTURE OF A MAGNETIC FIELD. 171 helix and a steel magnet; directly the currents in themolecules of the magnet are considered, everythingresolves itself… … Fig. 30.—A, an element of a magnetic line of force with the electric whirl round it;B, a bit of an electric circuit with one of its magnetic lines of force shown roundit, and the electric whirl round this ; each magnetic line of force round a currentbeing an electric vortex ring. Compare Fig. 39.…
Electricity
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