Iм- PROVEMENTS IN APPARATUS FOR PREVENTING SMOKE
Year: 1879

page_text: LETTERS PATENT to Thomas James Allen, junior, of Millwall, and Joseph
Boes, of Cubitt Town, in the County of Middlesex, for the Invention of "Iм-
PROVEMENTS IN APPARATUS FOR PREVENTING SMOKE,"
L
200
T
LETTERS PATENT to Thomas James Allen, junior, of Millwall, and Joseph
Boes, of Cubitt Town, in the County of Middlesex, for the Invention of "Iм-
PROVEMENTS IN APPARATUS FOR PREVENTING SMOKE."
Sealed the 20th January 1880, in pursuance of an order of the Lord Chancellor,
and dated the 4th July 1879.
PROVISIONAL SPECIFICATION left by the said Thomas James Allen and
Joseph Boes at the Office of the Commissioners of Patents on the 4th July
1879.
q
THOMAS JAMES ALLEN, junior, of Millwall, and JOSEPH BOES, of Cubitt Town, in
the County of Middlesex. "IMPROVEMENTS IN APPARATUS FOR PREVENTING
SMOKE."
.
According to this Invention we cause the products of combustion coming from
the grate or fire place of any steam boiler or other apparatus used for the production
of heat, such as kilns, bakers' ovens, and heating stoves, to pass through a set of
tubes fastened at each end in a plate fitting the flue or flues from the fireplace, and
we cause steam to commingle with such products of combustion passing through
the said tubes; this steam may be generated from a pan or vessel placed at the
front end of the tubes and supplied with water by ball cock or other suitable
appliance; or the steam may be supplied by a pipe or pipes from the steam space
of the boiler itself or from any steam boiler. Beyond this set of tubes we somno-
times for long flues arrange one or more similar sets of tubes. Beyond the set of
tubes (or intermediate if more than one set is used) we arrange one or more slabs
or blocks of fire clay pierced with slits or other apertures. In some cases wo
dispense with the steam.

page_text: =
-SPECIFICATION in-pursuance of the conditions of the Letters Patent filed by the
said Thomas James Allen and Joseph Boes in the Great Seal Patent Office on
-the 20th January-1880.
THOMAS JAMES ALLEN, junior, of Millwall, and JOSEPH BOES, of Cubitt Town, in
the County of Middlesex. "IMPROVEMENTS IN APPARATUS FOR PREVENTING
SMOKE."
The object of this Invention is to prevent the formation or escape of objection-
able smoke from the chimneys for steam boiler or other apparatus used for the
production of heat, such as kilns, bakers' ovens, and heating stoves.
For this purpose we, according to this our Invention, cause the gaseous products
of combustion coming from the grate or fireplace to pass through one or more slits
or apertures in blocks or slabs of fireproof material placed in the flue or flues from
the fireplace, and we cause steam to commingle with such products of combustion
passing through the said blocks, all as hereinafter described.
And in order that this Invention may be fully understood we will now proceed
-to describe the same with reference to the accompanying Drawings, in which we,
as an example, have shown the Invention applied to a baker's.oven, premising
that the same arrangement with slight modifications according to the form and
position of the flues is applicable to the flues of other apparatus for the production
of heat.
Figure 1 is a vertical longitudinal section; Figure 2, a front elevation; Figure 3,
a plan section on line C, D, Figure 1; and Figure 4, a vertical cross section on
line A, B, Figure 1; Figure 5 to 16 are details.
a
The gaseous products of combustion coming from the grate or fireplace G pass
off by the flue F under the bottom of the oven O in the usual manner; P is the
oven door, which however sometimes may be placed at the side of the oven; B is
an iron vessel supplied with water and placed in the lower part of the flue, forming
bridge, so that the flame and heat strike against it and evaporate the water therein.
This vessel B is shown separately in Figure 5, which is a front elevation; in
Figure 6, which is a side or end view; and in Figure 7, which is a vertical section
on line G, H, Fig. 1; referring to these last named Figures the vessel B is supplied
with water as required by the feed pipe E, which is connected with a feed cistern
having ball cock or other automatic supply appliance, whereby the water in the
vessel B is kept as nearly as required at a constant and suitable level. The steam
generated in this vessel escapes by the long narrow slip or aperture D, or by a
number of small pipes D¹, as shown in dotted lines, in the same direction as the
products of combustion. The products of combustion and the steam pass together
through holes or slits, by preference conical, through the block A of fire clay or
other fireproof material; they are thus compelled to intermingle with each other,
and the high heat of the block A combined with the contraction and intermixture
of the parts of the gases are conducive to perfect and smokeless combustion. A' is
a second and shorter perforated block or slab of fireproof material placed a short
distance beyond the first block A with a view to a still further turning over and
intermixture of the particles of the gases.
For long flues we sometimes use more than two such perforated blocks; for such
cases we also sometimes use one or more extra vessels or hollow bridges B with
slit or tubes, and so that there are one or two slabs of fireproof material between
each two such vessels B. The form of such vessel or bridge and the steam outlet
aperture or apertures therefor may be greatly varied, according to the form of the
flue and of the boiler or other parts connected therewith. Figure 8 is a vessel B
of a half round form, specially suitable for a locomotive or portable steam boiler;
Figure 9 a side view, and Figure 10 a vertical longitudinal section through same.
The steam required for the box B may if desired be supplied from the steam

page_text: space of the boiler to which this apparatus is applied, or from another steam boiler;
or the exhaust steam of a steam engine may be utilized for this purpose; H, H, are
pipes for such steam supply to the box B. In some cases we only turn on the
steam for use in the flue when fresh fuel is placed on the grate, and turn it wholly
or nearly off a few minutes after.
Figure 11 is a front view, and Figure 12 a plan of a block or slab A or A' with
taper holes through; Figure 13 is a back view, and Figure 14 a plan of a slab of a
modified form, also with taper holes; Figure 15 is a front view, and Figure 16 a
plan of a somewhat different form of slab, having one long slit and a number of
small parallel round holes all round. The form and configuration of these blocks
or slabs and their perforations may be varied in a great many ways. and we do
not confine ourselves to any particular one.
And having thus described and ascertained the nature of this Invention, we
declare that we are aware that it has heretofore been proposed to pass the gaseous
products of combustion from a fireplace through one or more perforated blocks or
slabs of fire-proof material, also that it has been proposed to force the draught and
to cause an intermixture of the gases in the flue by means of steam jets; but we
claim,―
Firstly. The combination of parts forming our improved smoke preventing
appliances, in which the gaseous products of combustion from a fireplace, together
with steam from a box B, are caused to pass through one or more perforated blocks
of fireproof material placed in a flue, substantially as and for the purposes set
forth.
Secondly. The combination of one or more water bridges fitted with one or more
apertures for the outlet of the steam and one or more perforated blocks of fireproof
material placed in a flue, substantially as and for the purposes set forth.
In witness whereof, I, the said Joseph Boes, for myself and on behalf of the
said Thomas James Allen, have hereunto set my hand and seal, this
Seventeenth day of January, in the year of our Lord One thousand eight
hundred and eighty.