Currents, Thermo-electric

These currents, as produced from existing thermo-electric batteries, are generated by low potential, and are of great constancy. The opposite junctions of the plates can be kept at constant temperatures, as by melting ice and condensing steam, so that an identical current can be reproduced at will from a thermopile. Thermo-electric currents were used by Ohm in establishing his law. (See Ohm's Law.)