A technique for faradic stimulation of tissues beneath the integument in the absence of conductors penetrating the skin.

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Abstract
A collodion coated coil is embedded beneath the skin and electrodes led to the point to be stimulated, e.g., the motor cortex. The coil and electrodes are completely sealed off under the skin, no wires extending through the integument. The coil is activated from a primary field coil placed near it but outside of the animal, and the current induced will produce a shock at the electrode tips. A circuit for a thyratron generator is diagrammed and described. Because of its stability, its low cost, and the fact that it can be run from commercial power lines, the thyratron generator is preferred above other methods for providing the current for the energizing electromagnetic fields.