The distribution of current density in lead accumulators

An expression has been obtained for the distribution of current density over a plate, involving the polarization at the plates, the fall of potential in the body of the plates, and the resistance of the electrolyte between the plates. The polarization has been measured at both the positive and negative plates for various current densities. The fall in potential in the plates has been calculated and the calculation confirmed by direct measurement on a special type of cell. Values of the mean current density at various times throughout the discharge have been determined for various points along the vertical length of the plate, and the total capacity per unit area at these points has been estimated. These values are confirmed by the changes in acid density found at various parts of the cell during discharge.