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342 TECHNICAL WORLD ^LVGAZiXiC<br />
cliaii^cd into either or both of two redwood<br />
Humes or troughs, each thirty feet<br />
long by twenty-two inches wide by<br />
eighteen inches deep, set on a gradient<br />
of one inch to thirty feet and placed side<br />
bv side, with a working space between.<br />
Each tlume is equipi)ed with ten sets<br />
of electrodes, spaced thirty-two inches<br />
apart, center to center, and operated in<br />
parallel. Each electrode set consists of<br />
twenty-nine plates, twenty-four by nine<br />
inches, spaced five-eighths inch center<br />
to center. Rags and extraneous things<br />
are arrested by baffles, and removed from<br />
time to time.<br />
In the ]:)assage of the sewage through<br />
the centrifugal ]nimp. the other solids<br />
are reduced to small ])articles very suitable<br />
for electrolysis. As but few sewage<br />
treatment i)lants can be so situated as to<br />
admit of operation entirely by gravity,<br />
this desirable pump feature would rarely<br />
call for extra or especial treatment. The<br />
end board at the discharge end of each<br />
flume is fitted at top with an adjustable<br />
weir plate to regulate the water to desired<br />
height in the flume, and at the<br />
bottom with a liglit wt)oden flap gate.<br />
extending full width of trough for washing<br />
out purposes. The tlischarge over<br />
the weir falls into the open end of the<br />
outfall pipe.<br />
The electrodes as first installed consisted<br />
of alternate plates of iron and<br />
aluminum ; these ])lates were decomposed<br />
very ra])idly. having a useful life of only<br />
tlu-ee weeks. The cost of replacement<br />
at such brief intervals would have proved<br />
])rohil)itorv to the use of the ])lant. All<br />
iron plates of No. 8 gauge were then<br />
substituted at very substantial gain in<br />
durability.<br />
The plates, however, still showed undue<br />
tendency to decomposition along the<br />
u])l)er edges. Experiments were then<br />
made to protect the upi)er edges by<br />
L"-shaped copi)er clips or bindings of<br />
number twenty-eight gauge. threefourths<br />
inch deep, extencling the entire<br />
length of each plate, tightly pressed or<br />
squeezed on. to give good contact. This<br />
experiment was very successful, good<br />
protection was given to the edges of the<br />
plates, at the same time a more uniform<br />
wear was observable over their entire<br />
siu-face. All the i)lates are now fitted<br />
F.i.K.r'rKoTV'nc sFW.\r;i-<br />
tki- atmfni- n wt at santa monica. cal.
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