A new form of electrolytic tank

The chief cause of erratic results when field gradients are measured in an electrolytic tank by means of closely spaced probes is shown to be variability of the meniscus near the probes. A new form of tank is described in which measurements are made by capillary probes in a plane defined by an insulating surface, thereby eliminating the meniscus effects present when the probes are placed in a free surface.