IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR CONSUMING SMOKE AND ECONOMISING FUEL
Year: 1874

page_text: LETTERS PATENT to Henry Schallehn, of Manchester, in the County
of Lancaster, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION
OF FURNACES FOR CONSUMING SMOKE AND ECONOMISING FUEL."-A com-
munication from abroad by Henrick Gottfried Stamer, of Altona,
Holstein, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Henry Schallehn at
the Office of the Commissioners of Patents, with his Petition, on
the 8th April 1874:
· I, HENRY SCHALLEHN, of Manchester, in the County of Lancaster,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN THE CONSTRUCTION OF FURNACES FOR CONSUMING SMOKE AND ECONOMISING
FUEL," (a communication to me from abroad by Henrick Gottfried
Stamer, of Altona, Holstein, in the Empire of Germany,) to be as
follows:-
This Invention applies principally to the construction of the furnaces
of stationary steam boilers, more especially those of "Cornish" steam

page_text: boilers, but it is also with slight modifications equally applicable to other
stationary furnaces.
The Invention consists essentially of a cast-iron body resting upon a
foundation of brickwork placed immediately behind the fire-bars in the
position usually occupied by the ordinary bridge. This cast-iron body
consists of a base plate with one vertical and two slightly inclined ribs
resting longitudinally upon it, the latter being connected also by a
central and two end transverse ribs.
In each of these longitudinal ribs a. narrow channel is formed, which
channels unite in a chamber formed in the base plate, and at the upper
end form narrow slits or openings extending across the whole width of
the furnace, and discharging themselves into the space above the cast-
iron body or bridge through which the gases and other products of com-
bustion pass to the flue. The lower chamber opens out into the ash-pit,
and the aperture can be regulated by a valve or damper actuated by
means of a rod or lever placed within reach of the engineer.
The difference in temperature between the ash-pit and the interior of
the furnace causes a strong draught of air to enter by the valve or
damper and pass into the furnace by each of the aforesaid narrow slits
or openings, and in consequence of the sides of the ribs being exposed
to the heat of the fire and gases inside the furnace this air becomes
heated on its passage, and mingling in this state with the unconsumed
gases and fuel causes a perfect combustion, whereby all smoke is pre-
vented, and the quantity of fuel consumed greatly economized.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Schallehn in the Great Seal Patent Office
on the 8th October 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
SCHALLEHN, of Manchester, in the County of Lancaster, send greeting."
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent bearing date the Eighth day of April, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,

page_text: give and grant unto me, the said Henry Schallehn, Her special licenso
that I, the said Henry Schallehn, my executors, administrators, and
assigns, or such others as I, the said Henry Schallehn, my executors,
administrators, and assigns, should at any time agree with and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for. "IMPROVEMENTS
IN THE CONSTRUCTION OF FURNACES FOR CONSUMING SMOKE AND ECONOMIZING FUEL,”;
(a communication to me from abroad by Henrick Gottfried Stamer, of.
Altona, Holstein, in the Empire of Germany,) upon the condition
(amongst others) that I, the said Henry Schallehn, my executors or:
administrators, by an instrument in writing under my, or their, or one,
of their hands. and scals, should particularly describe and ascertain the.
nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
.
NOW KNOW YE, that I, the said Henry Schallehn, do hereby declare
the nature of the said Invention, and in what manner the same is to be:
performed, to be particularly described and ascertained in and by the
following statement and accompanying Drawings (that is to say) :—
This Invention applies principally to the construction of the furnaces
of stationary steam boilers, more especially those of "Cornish" steam
boilers, but it is also with slight modifications equally applicable to other
stationery furnaces, the object of the said Invention being to consume
smoke and economize fuel.
Such being the nature and object of the said Invention I will now
proceed to describe more in detail the manner in which the same is to
be or may be performed or carried into practical effect, and in order that
the same may be clearly understood I have annexed hereunto a Sheet
of Drawings illustrative thereof, and have marked the same with figures
and letters of reference corresponding with those in the following
explanation thereof:---
Fig. 1 in the annexed Drawing is a longitudinal section through part
of the fire-box and flue of a stationary steam boiler, shewing the
application of the Invention thereto.
"
}

page_text: Fig. 2 is a transverse section through about the line A, B, in Fig. 1;
Fig. 3 is also a transverse section of the left hand half through the
line C, D, and the right hand half through the line E, F, in Fig. 1.
Fig. 4 is a half ground plan and horizontal section, the upper half
being a ground plan and the lower half a section through the line G, H,
in Fig. 1. a, a, is part of the boiler flue, and b, b,. the fire-bars.
The Invention consists essentially of a cast-iron body. c, c, resting
upon a foundation of brickwork placed immediately behind the fire-bars
b, b, in the position usually occupied by the ordinary bridge. This cast-
iron body consists of a base plate c, c, with one vertical and two slightly.
inclined ribs d, d', d", resting longitudinally upon it, the latter being
connected also by a central and two end transverse ribs e, e, e. The.
face of the vertical plate d may be made of fire-brick to ensure greater
durability and give out more heat.
In each of these longitudinal ribs a narrow channel f, f, f, is formed,
which channels unite in a chamber g, g, formed in the base plate c, c,
and at the upper end form narrow slits or openings extending across the
whole width of the furnace, and discharging themselves into the space
above the cast-iron body or bridge through which the gases and other
products of combustion pass to the flue. The lower chamber g, g, opens
out into the ash-pit h, h, and the aperture can be regulated by a valve or
damper i, i, actuated by means of a rod or lever h, h, the other end of
which is placed within reach of the engineer.
•
The difference in temperature between the ash-pit h, h, and the
interior of the furnace causes a strong draught of air to enter by the
valve or damper i, i, and pass into the furnace by each of the aforesaid
narrow slits or openings f, f, f, in consequence of the sides of the ribs
d, d, d", being exposed to the heat of the fire and gases inside the
furnace this air becomes heated on its passage, and mingling in this
state with the unconsumed gases and fuel causes a perfect combustion;
whereby all smoke is prevented, and the quantity of fuel consumed
greatly economized...
Having now described the nature and object of the said Invention,
together with the manner in which the same is to be or may be per-
formed or carried into practical effect, I wish it to be understood that I
claim as the Invention communicated to me by the said Henrick
Gottfried Stamer, the construction and application of the apparatus
.
:

page_text: herein-before described and shown in the annexed Drawings, substan-
tially in the manner and for the purposes above particularly set forth, or
any mere modification or imitation thereof constructed and operating in
substantially the same or a similar manner.
In witness whereof, I, the said Henry Schallelin, have hereunto
set my hand and seal, this Eighth day of October, in the
year of our Lord One thousand cight hundred and seventy-
four.
HENRY SCHALLEHN. (L.S.)