Various phenomena associated with the steady state of the cell normalFe|H2SO4false(2Nfalse)|normalPt are discussed with particular emphasis on the factors governing reproducibility. The formation of a brownish, gelatinous coat is observed, but its significance is obscure and it appears to have no direct effect upon transients produced by short off‐times. An empirical equation has been found which represents the short off‐time transients over a relatively wide voltage range. A discussion is given of the principal points that must be embodied in a theory describing the transient behavior of the cell. The part played by the charging of the usual double layer is demonstrated to be of little consequence in the observed transients.

Anodic behavior of copper in 2N HC1 has been studied by both electrical and optical methods The temporal behavior of current and voltage have been found, as well as the current vs. voltage characteristics. The anode surface has been observed both visually and photographically with the aid of conventional microscopes, and the anolyte has been photographed cinematographically using a sehlieren microscope.When the current is turned on, a layer, probably CuC1, starts to form at random nucleation spots on the anode. This grows until the whole anode is covered, at which time the current drops abruptly. Up until this time the anolyte becomes less concentrated, but the concentration may increase again after the current has become low.The anode-calomel voltage may be written as V = e(i) + it, where e(i) becomes constant at high current densities. The values of e(i) have been found by both the interruption and the direct method, and there appear to be at least four of physical significance These values are --0.35, --0.27, -0.05, and +0.11 v.In general, the current drops twice before reaching its minimum value. If t I is the time from the make to the first drop, and if Q = ]to1 i dt, and if io is the "initial" current after the make, then empirically Q = 24(io -0.70) -0 53, where io is in ma.The anode layer is about 3 ~ thick in the steady state. When the circuit is broken, r and e change rather rapidly (in about 0.1 sec), but the layer dissolves off slowly.