In order to obtain records of the action currents from voluntary and reflex contractions of the muscles of the human body, we have devised an electrode that is considerably simpler in construction and manipulation than any of the others commonly employed today. It consists of a sheet of pure zinc about 1 inch square, held in contact with the skin by means of a paste made of kaolin and saturated zinc sulphate solution. This paste alone is sufficient to hold the electrode in place on almost any part of the body; where there is much violent movement of muscles, a large rubber band may also be applied.
This electrode has the following advantages: (1) It is ncnpolarizable; (2) it is quickly and easily prepared; (3) it can be attached over any part of the body, however irregular and inaccessible to other electrodes, and (4) it makes an intimate, moist contact
Richter CP. NEW METHODS OF OBTAINING ELECTROMYOGRAM AND ELECTROCARDIOGRAM FROM THE INTACT BODY. JAMA. 1926;87(16):1300. doi:10.1001/jama.1926.92680160003013c