lar intervals with bore holes or channels approximaely
20 - 40 mm in diameter, parallel to the large surface
35
planes of the electrodes and preferably parallel to their
shorter rectangular dimension, which bore holes con
duct the produced gases and depleted electrolyte away
from the electrode surfaces and eventually out of the
cell. The inside surfaces of the said bore holes are
40
painted with a suitable liquid, for instance, with a cold
curing phenolic resin, in order to avoid erosion of the
soft graphite by .the moving gases and liquids during the
operation of the cell. This simple resin painting is very
useful, because it allows the use of a lower graphite
45
quality while still providing adequate discharge chan
nels for the discharge of the formed gases and of the
spent electrolyte, a portion of which may be recircu
lated as later described.