Improve- MENTS IN FURNACES FOR CONSUMING SMOKE
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Frederick Brown at the
Office of the Commissioners of Patents on the 5th October 1882.
FREDERICK BROWN of Farley Hill Luton in the County of Bedford “Improve-
MENTS IN FURNACES FOR CONSUMING SMOKE "
This invention has for its object improvements in furnaces for consuming smoke..
In a Provisional Specification lodged by me on the 5th day of June last N° 2635
I described an arrangement of bridges for this purpose-I have now discovered-
that their efficiency is increased by a peculiar shape of fire bar.
The bars I propose to use are made to incline upwards at the back end and are
made unusually deep.
The upward incline at the back prevents the fuel clinker and dirt from accumu-
lating there at the foot of the lower bridge and thus allows the air to pass freely
up through the bars mix with the gases and smoke behind the hanging bridge
where it combines with them and burns.
+
The unusual depth given to the bars not only keeps them cool but also tends to
heat the air passing through them and thus improves the combustion.
This form of fire bar is also beneficial in other furnaces.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Brown in the Great Seal Patent Office on the 5th April
1883.
FREDERICK BROWN of Farley Hill Luton in the County of Bedford "IMPROVE-
MENTS IN FURNACES FOR CONSUMING SMOKE >>
This Invention has for its object improvements in furnaces for consuming smoke.
In the Specification of my patent dated the 5th day of June 1882 No. 2035 I
described an arrangement of bridges for this purpose. I have now discovered
that their efficiency is increased by a peculiar shape of fire bar.

page_text: The bars I propose to use are made to incline upwards at the back end and are
made unusually deep.
The upward incline at the back prevents any great accumulation of the fuel
clinker and dirt at the foot of the lower or usual bridge and thus allows the air to
pass freely up through the bars mix with the gases and snioke behind the hanging
bridge where it combines with them and burns.
The unusual depth given to the bars not only keeps them cooler but also tends
to beat the air passing through them and thus improves the combustion.
This form of fire bar is also beneficial in other furnaces,-promoting inore perfect
combustion and the consumption of smoke.
The annexed drawings Figures 1 and 2 show in vertical section furnaces provided
with any fire bars and with my bridges, the latter as described in the specification
of my former patent.
From the front of the bar as far as the point A beneath the hanging bridge the
surface of the bar is horizontal or nearly so and at or a short distance beyond the
point A the surface inclines rapidly upwards and terininates at B but a short
distance below the top of the lower bridge. The bars may be of any convenient
length and width on the face and with the air spaces between them as at present.
It will be seen that my bars prevent accumulations impervious to air forming at
the foot of the lower bridge and ensure the due admission of air to the fuel
throughout the whole length of the grate. The proportions given to the bar as the
drawing indicates are such that on the one hand the bar is not liable to become
over heated and on the other the air entering between the bars is duly heated
before coming into contact with the fuel. The hanging bridge deflects downwards
the smoke and gases arising from the raw fuel and compels them to pass over the
bank of ignited and highly heated fuel supported upon the inclined portion of
the fire grate.
These bars may however also be used advantageously in furnaces in which
hanging bridges are not employed.
Sometimes it is convenient to have the bars in two lengths as indicated by
Figure 3.
What I claim is:-
First, Furnaces having fire bars inclining upwards at the back substantially as
described.
Second Furnaces having fire bars inclining upwards at the back and also
hanging bridges the said parts cooperating to consume smoke substantially as
described.
Third. My fire bar substantially as shown in the annexed drawings.
In witness whereof 1 tlie said Frederick Brown have hereunto set my hand
and seal this fifth, day of April.in the year of our Lord One thousand
eight hundred and eighty threo.
FREDK. BROWN (L.S.)