IMPROVE- MENTS IN STEAM BOILER AND OTHER FURNACES
Year: 1876

page_text: LETTERS PATENT to George Nathaniel Shore, of Middle Chinnock, near
.Ilminster, in the County of Somerset, and George Hayter Chubb, of 57, St.
Paul's Churchyard, in the City of London, for the Invention of "IMPROVE-
MENTS IN STEAM BOILER AND OTHER FURNACES."
the 1st September 1876, and dated the 2nd March 1876.
PROVISIONAL SPECIFICATION left by the said George Nathaniel Shore and
George Hayter Chubb at the Office of the Commissioners of Patents on the
2nd March 1876.
GEORGE NATHANIEL SHORE, of Middle Chinnock, near Ilminster, in the County
of Somerset, and GRORGE HAYTER CHUBB, of 57, St. Paul's Churchyard, in the City
of London. "IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES.".
The object of this Invention is to obtain more perfect combustion of fuel in
steam boiler and other furnaces. For this purpose we use hollow fire-bars, which
may extend nearly the whole length of the furnace; the front ends of the hollow
fire-bars are open, whilst their back ends are connected to a cross tube of larger
diameter, through which air can be admitted to or forced through them. This
cross tube may either communicate at its ends directly with the outer air or air
may be forced into it by a fan or otherwise. The upper part of the furnace is entirely
closed, and the door or doors are made to fit closely, so as to allow little or no air to
enter by them. When the furnace is in action the doors are closed, and air passes or
is forced through the fire-bars. The streams of air passing from the open end of the
fire-bars strike against the door or end of the furnace, and after rising upwards
pass downwards through the fuel and between the fire-bars to an outlet flue or
chimney.
If more air is required to keep the fire-bars cool than is necessary for the perfect
combustion of the fuel, provision may be made for allowing such excess of air to
escape without passing into the furnace.
The inner side of the door may be protected by a plate, and the incoming streams
of air may rise up between this plate and the door.
In place of the fire-bars being hollow solid bars might be used, and a stream or
streams of air be similarly caused to enter a closed furnace, and after rising upwards
be caused to pass down through the fuel and between the fire-bars to an outlet flue
or chimney. The air supplied to the furnace may be mixed with gaseous or other
matters to promote more perfect combustion.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Nathaniel Shore and George, Hayter Chubb in the Great Seal
Patent Office on the 2nd September 1876.
GEORGE NATHANIEL SHORE, of Middle Chinnock, near Ilminster, in the County
of Somerset, and GEORGE HAYTER CHUBB, of 57, Saint Paul's Churchyard, in the
City of London. "IMPROVEMENTS IN STEAM BOILER-AND OTHER FURNACES."
The object of this Invention is to obtain more perfect combustion of fuel in
steam boiler and other furnaces. For this purpose we use hollow fire-bars, and air
is admitted to or forced through them. The air may be forced by a fan or other-
wisc. The upper part of the furnace is closed,, and when the furnace is in action
the air passes through the fire-bars, issuing from their ends, rises upwards, and
afterwards descends through the fuel and between the fire-bars to an outlet, flue, or
chimney.
In order that our Invention may be fully understood, and readily carried into
effect, we have shown in the Drawing hereunto annexed part of an ordinary
Cornish boiler with the fire-box or furnace constructed in the manner we prefer for
carrying out our Invention.
u,
A
Figure 1 shows a longitudinal section of the front part of the boiler shewing-its
fire-box or furnace, and Figure 2 is a transverse section of the furnace taken at the
line ს. The ordinary furnace bars are superseded by the tubular bars c; c, sup-
ported on bridges or bearers d, d, d; e is the usual dead plate at the front of the
furnace, and f is an air box fitting against the same, into the back end of which air
box are received the front ends of the tubular fire-bar c, c; their other ends are
received into a kind of hollow bridge g at the further end of the furnace h; i is a
valve consisting of two wings fixed at an angle, as shewn, and capable of being
rocked on a centre or hinge j by means of a lever rod k reaching to the outside
'front of the furnace. The upper wing consists of a solid plate at the back, and a
perforated one fixed at a short distance in front of it, so as to form a chamber.
tube conveys air from without (with or without the aid of an artificial blast) to
the box, and thence through the fire-bars c, c. This air passes on through the
hollow bridge g, and upward through the perforated front plate of the valve wing h
into the furnace, thence passing down through the fuel and between the fire-bars,
and out through the lower valve in the direction shewn throughout by the
arrows, and thence through the boiler flues. The valve h, 2, is shewn in its normal
position, forcing the air to pass downward through the fuel, but should it at any
time be needful to use temporarily an upward draught the valve i can be closed by
means of the rod , and the top valve h will be simultaneously opened. The
tubular bars c, c, may be round, as shewn, or oval or of other section which may
be advisable; but we prefer to employ tubes which are flattened at the sides.
Having thus described the nature of our Invention, and the manner of performing
the same, we would have it understood that we claim, the construction of steam
boiler and other furnaces with hollow fire-bars, through which the air for sup-
porting combustion is passed and delivered to the fire-box above the fuel, whilst
the products of combustion are led away between the bars, substantially as herein-
before described.
In witness whereof,. I, the said George Nathaniel Shore, have hereunto set my
hand and seal, this Second day of September, in the year of our Lord
night hundred and coventy-six