Tombstone epitaph., 1918-04-21

w money and he is now busily
engaged teaching the rest
OF the country how to perform the
same trick. He does this by means Of
devices which, through electrical pre-
cipiiation, not only reclaim vast
wealth from the smoke, dust and
Tunes Of smelters and other plants.
but at the sane time redeem thou
sands Of acres Of nearby land. As a
matter of fact, the curb which he has
put upon the smoke and dust nuisance
his original aim-now actually bids
fair to be. In some directions. the pri-
mary reasOn.for the running OF certain
OF our industries. The smoke wizard
who has accomplished these remark
able things is DR.. Frederick G. Cot
trell, chief metailurgist Of the bureau
Of mines.
Doctor CottrelTs experiments began
several years ago when. as a member
OF the stan OF the University Of Cal
.ifornia. he was called upon to solve
the problem Of helping q smelter locat-
ed on San Francisco bay. The waste
gases and vapOrs from this smelter. re-
sulting from the sulphuric acid part
ing process used in treating gold and
silver bullion, were declared q nuts
ance BY neighboring farmers and
seemed likely to provoke costly nt-
cation and possibly lead to a shut
down Of the plant.
The gases discharged into the air
amounted to substantially 5000 cubic
feet per minute and held In suspension
an important proportion Of sulphuric
acid in the form Of a fine mist. The
corrosive action Of the sulphuric add
was shown throughout the entire zone
swept broadcast by the shifting winds,
and both the agiculturists and the
people generally had ample reason for
complaint. The smelter was a profit
able one and the management was
anxious to find some way to abate q
nuisance that was both q menace to
health and hurtful to vegetation.
Laboratory Mssts Industry.
Doctor CottrelIs preliminary work
brought up some puzzling situations.
Up TO q certain stage matters went
well enough on the miniature scale
Of the investigational tests, but be-
yond this was the question Of meeting
the practical situation presented By Q
large commercial smelter. A big part
Of Doctor Cottrell's achievement lay
in spanning the gap between the Ia
boratory and the Industrial plant and
In finding ways to control the enorm.
ous pressures Of the necessary cleo
tric current, mounting up to 10000
volta
The problem was solved. however,
and 90 well was the precipitator in
stalled at this smelter designed that
Il has been doing its work satisfactor-
fly ever since. Further. by mere
chance Doctor CottreIl attacked at
that plant what Is commonly admitted
to be the most difncuIt Of all problems
Of smoke or fume abatement. viz. the
precipitation Of acid mist.
The good results obtained in this
first instance soon became widely
known and q new line Of application
was opened q few years later when the
great copper smelter at Baiaklala. Cal,
was threatened with fume litigation
by the United States forestry service.
"Fume," or ine particles In the form
Of smoke. and sulphur dioxide eRa.
invisible to the eye, given on from the
stacks Of the smelter. had swept the
neiehboring country bare Of vegetation
for miles. and II was q case Of either
q shutdown or q suppression Of these
destructive discharges.
A fuil-sized plant Of the Cottreli
type was. accordingly. installed The
volume Of the gases treated averaged