Abstract
For improving the of ununiformity of thickness of the film in chromium plating a frame may be set around a cathode plate.By this method the cathode become the centre of new the cathode plate and the frame becomes the edge of the new cathode. The effects of this frame method are as follows: By this frame method the uniformity of the plating film thickness was much improved. As the result of experiments, the frame C was found most effective, followed by frame B,frame A and frame D in the order named. When the plating film centre is 5 μ, at the center, it was Ca. 4 μ at the around periphery. This tendency was improved by marking the contact area smaller. This improved method is effective for chromium plating of block gauges.
