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Current caps have wet contact electrodes that require liquid to be placed between the scalp and the sensor.

She was on her knees, apparently insensible; but one small hand felt the cold, wet contact, and she looked at it, and saw that it was blood.

The cool, wet contact of them with my dry, burning skin seemed to afford some relief to my tormenting thirst; and, encouraged by this small measure of success, I next cut a strip of leather from one of my boots and, dividing this into small pieces, I placed them, one at a time, in my mouth, masticating them as well as I could, and finally swallowing them.

Lying with her golden head in her arms, the splendid shoulders lax, she felt a strong impulse toward the water shoot through her form from head to heel at this wet contact with the naked earth.