This section is from the book "The Home Hand-Book of Domestic Hygiene and Rational Medicine. Volume 2.", by J. H. Kellogg, M.D.. Also available from Amazon: The Home Hand-Book of Domestic Hygiene and Rational Medicine, Volume 2.
Electricity occupies a very important place as a remedy for the relief of pain. As a general rule, the galvanic current is more effective than the faradic, though the latter sometimes succeeds when the other fails. Electricity is the most useful in cases not characterized by inflammatory action. In congestion, it gives relief by causing contraction of the extended blood-vessels. As a general rule, the positive pole should be applied at the seat of pain while the negative sponge is placed near by, at some point below, or at the origin of the nerve of the part. We have often felt exceedingly gratified for the assistance given us by this remedy in relieving the pain of suffering patients.