Figure 4.

Original drawings of the thin-layer cell and twin-electrode circuitry introduced by Anderson and Reilley and for monitoring rapid chemical processes $(R\stackrel{k}{\to }P)$ during redox cycling. The two working electrodes, W₁ and W₂, were maintained at independent potentials, E₁ and E₂, with a dual op-amp scheme used to measure the two currents. Adapted from references 58 and 59.