I. Certain cases of electromotive force sustained by the action of electrolytes on electrolytes

In the following experiments the electromotive force was observed by a quadrant electrometer arranged for maximum sensibility; the connexions were made through the reversing-key; and, excepting the time observations for polarization, the readings were made twice at least on each side of the zero-point. A single Daniell’s element gave 105 divisions deflection each way, so that in the following the unit of electromotive force js 1/100. the electromotive force of Daniell’s element. In all cases the electrodes were platinum wires dipping into the fluid under examination. In the experiments on polarization the circuit was readily closed for a specified time by bringing the platinum wires into contact, and broken by releasing them; the electromotive force could then be observed at any instant after breaking the circuit.