, 1875-01-31


eulniug, proportion OF the gas. Tbs reader
may sea- this method in operation IN the boiler
furnace OF -.Iesszs. Brown t. Van Arsdsla. ut the
corncr OF kingsbury aud Illinois streets. Tho
s:ea.u-iets stopped, smoke ia the result; turned
On, the result Is clear Iane and no b1aoke.-
must confess that can SEQ no reason why this
same method, rightly applied, should nor answer
IN all cases. There is roo, neither trono!e u1fn-
dult;, nor large expense connacted with IT.:
Dluhng or expanding the a1r means heatlagl t.
This, besides, makes sure Of the point OF tenn
rerature, which is so necessary for combustion.
Forcing common air into the body Of the r'> /
IN ordinary fu1nace is to no purpose, an :
angrnents the amount Of escaping gas (. =.
II Sufficient height is Afforded over tho q
air may ba let in over it and become, -
pears, sufficiently heated before reno C
critical point. In fact. q limited ouanti-, IL
any case be there admitted Will. market .tst
a ho--air furnace for hard coal fire III. ',1en
lately constructed BY a!r. ". E. Lott, ,:lecaln-
ical engineer, 10. 157 Washington street: in
which the Gas is completely consumed in this
manner. He admits the II; into large space
oVar, and separated from, the fire, SO tha. the
gas comcs In contact. as 1t were, with the further
heated edge Of . considerable body Of air.
Whatever may be the explanation, the result ia
that the gas is co,,s,.mcd, without occasional
plosions, in such degree that even small Jumps
OF SOFT coal may DO mixed with the hard coal
without becoming Offensive. But tho most ra-
tlonal way, in OF soft-coal fires, seems to
to Introduce the mir, in heated state, into the
very body OF the gas behind the Srata. Tho dith-
Guilty only seems to be to sufficiently heat :he
oir. A perforated iron bridge may suffice in
some cases, but cannot be fully relied upon, as
the experience of Messrs. Masinnis j. Co. seems
to bo; their bridge %e~al1-npporatus only giving
satisfaction in exceptional cascs- II they will
givo sufficient amount of heating surface to
the airinuoduced, they will doubtless meet with
general success- Experimontcrs nre apt, as
believe, to overlook one important fact connected
with furnaces, namely, that there ia great differ
ence III the temperature Of their gases,
owing mainly to differences in draught, which,
as is well known, varies with the season as well
as With tho condition Of the atmosphere and
from other causes. Hot gnses will bca1 mixing
with cold air moro readily than will gases OF
lesser temperature. A ready mode OF heating
the mir suggests itself, as by means OF common
rageaerators, through which part or all Of the
products OF combustion are allowed to pass
alternately. This. in fact was ttie1 thirty years
ago, under application Of a blowar, with good
success as to combustion, but with poor success
as to any boiler, the heat being too excessive
Another mode has been tried BY one Nohl. in
this Stata, and the Crane Bros. Manufacturing
Company had one OF their boilers operated by
bim- He blew cold air into the coal to raise the
temperature OF the gas enough to enable him
to blow cold mir into it. The SUCCESS as to por-
feet combustion IVES vory marked, but tue heat
was too excessive, and destroyed the boiler.
4 very ingenious mode Of perfect combustion
Was established yea1B ago by tho Siemens
Brothers in London. They manufacture the
gas in distinct furnace, 200 or 500 feet away
from the furnace proper, and condact it to the
same in tunnols. Their theory is that the gas
must be cool, and the air heated They there
foro lead the ho. gas On its way through, nj
ternataly, one Of Two large regenerators, through
which, vice versa, the air passes, to absorb the
heat thero deposited Gas and heated air enter
the furnace side by side. Combustion is abso-
lu:ely perfect. and enormous temperatures ara
attained Su.h furnaces. of course, are not
applicable for steam boilers still it to
interesting to know how pretixod principle Of
perfect combustion is applied with such perfect
aucceBs.
What have endeayored to do in this article is
to furnish information to tbs experimenters
upon the eubjecs OF smoke-burning. In ono d.
recton, tha. OF dluting the gas regard smoke
burning wholly solved. In tho other direction,
that Of diiuing the cir, it seems to me not dil6-
cult Of sosution, il the experimentera will heed
the points. HAY they consider that after tho
tsmperc:uro OF the gas is quite low Compare
lively SOY, aud that, consequently, means must
be provided OF raising that Of tho air ths higher
tie better for Eorfect combustion If. however,
too high, it Ia detrimental to boilers The result
is hearty Endorsement Of the demand made by
THE IEtBuNE to indict the smoke-nuisanca Al
an onense to be punished by Law.
F. RAuMAHH.