I use rectangular electrodes 1/4" X 4" wet area and they wear evenly. They get thinner and thinner over time, yet they retain their 1/4" width. This leads me to believe that the current density is uniform throughout the electrode and not just at the edge.

At 09:04 AM 6/10/03, Mike Monett wrote:
  As you point out, the key would be to find the wear pattern.  If the
  thickness diminishes  evenly,  it may be a good idea.  If  it simply
  wears from  the bottom, then it is no better than cut  rods.  As you
  mentioned some  time ago, your rods using round wire with  a  "U" at
  the bottom wear evenly. This is a good indication of uniform current
  density and low particle generation.

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