The Standard Electrical Dictionary

1. Magnetic Matter

   Imaginary matter assumed as a cause of magnetism. Two kinds, one positive and one negative, may be assumed as in the two fluid theory of electricity, or only one kind, as in the single fluid theory of electricity. Various theories of magnetic matter have been presented whose value is only in their convenience. [Transcriber's note: See "magnet" and Edward Purcell's explanation of magnetism using general relativity.]