. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap, xi.] NON-POLARISABLE ELECTRODES. 113 solution, the two troughs will not be in the same con- dition. If now a piece of tissue were placed upon the DERIVING CUSHIONS of the non-polarisable electrodes, the zinc solution would attack it, corrode it, and vitiate any result. To prevent this, a piece of sculp- tor's clay is made into a soft mass with a ^ to 1 per cent, solution of common salt, which is a good con- ductor. This is made
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap, xi.] NON-POLARISABLE ELECTRODES. 113 solution, the two troughs will not be in the same con- dition. If now a piece of tissue were placed upon the DERIVING CUSHIONS of the non-polarisable electrodes, the zinc solution would attack it, corrode it, and vitiate any result. To prevent this, a piece of sculp- tor's clay is made into a soft mass with a ^ to 1 per cent, solution of common salt, which is a good con- ductor. This is made into a thin sheet, and is folded over the cushion, as shown in Fig. 58, P. It is called THE CLAY GUARD. To limit the part of the clay guard to be touched by the piece of tissue, a small piece of thin mica may be placed on the guard. The clay guard is not used merely to prevent corrosion and destruction of the tissue. If the animal. Fig. 59.—Non-Polarisable Tube-Electrodes. tissue were placed directly upon the deriving cushions soaked in its zinc solution, a peculiar action would take place between the liquid conductor and the tissue, the result of which would be the develop- ment of what is called SECONDARY RESISTANCE, which would grievously diminish the intensity of any current that might be present. Salt solution is found incap- able of developing this secondary resistance when in contact with animal tissues, while at the same time it is a good Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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