Abstract
A new type of Hull cell, which can minimize the temperature rise in high current electrolysis, has been constructed and compared with two kinds of Hull cells commonly used at present. A printed circuit board divided into twenty portions was employed as the Hull cell panel to measure the potential and current distributions on the cathode. It was found that, by using this cell, the temperature variations in the cell were able to be controlled within a small range, and yet the current distribution was not disturbed even in the baths which require high current such as for chromium plating. The current distribution was measured easily, with a high input impedance electrometer, by dividing the panel accurately into twenty portions and connecting each portion with a very small (1.2mΩ) resistance. The current density distributions measured for copper sulfate bath and Watt's bath were similar to those as calculated from Nagasaka's formula.
