The law of electrical attraction and repulsion. Illustration from: Samuel Howard Monell. Electricity in health and disease (1907) | src internet archivePage 99. Electricity in health and disease : a treatise of authentic facts for general readers, in which is shown how electric currents are made to act as curative remedies, together with an account of the principal diseases which are benefited by them : presenting also the solution of the problem of tuberculosis in the United States by Monell, S. H. (Samuel Howard). | src internet archive
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