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458 RICHARDSON'S BLUEBOOK OF PROJECTION
flict. If, however, a strong magnetic field be imposed on such a substance by an outside agency, as by a wire carrying current or by stroking with a previously magnetized object, all the molecules will "fall in" along the magnetic lines of 'force, and the substance as a whole will be a magnet until the molecules again return to their haphazard positions.
(7) Soft iron will not retain its magnetism for the reason that there is nothing to hold its molecules in position once the external magnetizing influence is removed. Steel, however, consists of iron molecules rigidly held in a cement of carbon, silicon, or some other alloy. Steel is harder to magnetize than iron because the cement does not permit the iron molecules in the steel to change their positions very easily. Once magnetized, steel does not lose its magnetism easily for precisely the same reason, namely, that the alloy does not permit the molecules to fall back into their unmagnetic arrangement. A steel magnet will often retain its power for many years.
(8) Magnetism, then, is a property exhibited by negatrons whenever they are in motion. It may be masked, however, as in unmagnetic substances, or in unmagnetized iron, by the motion of an equal number of negatrons in an opposite direction. Thus, a steel screwdriver blade cannot be magnetized by winding around it a pair of wires in which the current flow is opposite. The magnetizing effect of one wire will be cancelled by the influence of the other.