had been treated.

Small brick tanks were erected at my wharf at Peckham and iron
electrodes fitted to them.

Wrought iron plates were fixed about an inch apart, and connected in
parallel in the tanks, forming one big cell. Sewage to the amount of
about 200 gallons was run into the electrode tank and then treated, the
results being so satisfactory that larger works were erected, when a
supply of sewage equal to 20,000 gallons an hour could be obtained.

After a number of experiments had been carried out it was decided to run
the sewage as rapidly as possible through electrodes, six cells or two
rows in series fixed in a long channel or shoot, for experience showed
that the motion of the liquid acted on reduced the back E.M.F. and
hastened the formation of the precipitate.

A channel is kept at the bottom of the electrodes for the silt to
collect, with a culvert at side to flush it into, so as to prevent any
block occurring; the advantage of this is obvious. The plates in each
section may be from half an inch to an inch thick, and can be of any
length up to 6 ft. It may possibly be objected that a large number of
plates is required. This may be so, but the larger the number of plates,
the less the engine power required, and the longer they last. In each
section the electrodes are in parallel, and any one section is in series
with the other, the arrangement being exactly like that of a series of
primary battery cells.

By actual experience I have been able to prove that at least 25 sections
of electrodes should be in series and across any one of these sections