IMPROVEMENTS IN AND RELATING TO STEAM- " BOILERS AND THEIR FURNACES AND FURNACE DOORS
Year: 1879

page_text: LETTERS PATENT to Thomas Lancaster, of Liverpool, in the County of Lan-
caster, for the Invention of IMPROVEMENTS IN AND RELATING TO STEAM-
"
BOILERS AND THEIR FURNACES AND FURNACE DOORS."
Sealed the 2nd December 1879, and dated the 6th June 1879.
PROVISIONAL SPECIFICATION left by the said Thomas Lancaster at the
Office of the Commissioners of Patents on the 6th June 1879.
"
THOMAS LANCASTER, of Liverpool, in the County of Lancaster. IMPROVEMENTS
IN AND RELATING TO STEAM BOILERS AND THEIR FURNACES AND FURNACE
DOORS."
My Invention relates to certain improvements in the construction and arrange-
ment of parts and furnaces of that class of steam boiler known as vertical cylindrical
high pressure boilers, and consists,―
Firstly. In constructing a vertical cylindrical boiler with a separate combustion
chambor placed over the fire box, and communicating therewith by means of vertical
tapered tubes of the "Galloway" type. The combustion chamber is provided with
an uptake passing through the upper part or dome of the boiler, and opening into
the chimney. The fire box may be provided with horizontal water tubes, connecting
the water spaces on each side of the boiler.
Secondly. In providing vertical cylindrical boilers with what I term a super
dome, forming a steam chest above the boiler, and communicating with the boiler
by means of perforations in the ordinary dome or top plate thereof.
Thirdly. In providing the furnaces of vertical cylindrical boilers with a ring or
lining.of terra cotta tiles or fire brick, extending upwards from the fire bars to a
line taken from the bottom of the furnace door or above. This ring or lining is
provided with verticle holes or passages all round, leading from the ashpit onto the
top of the furnace, so that currents of air may be induced to pass therethrough onto
the top of the fuel.
Fourthly. In providing the furnace door of boilers with an interior bonnet or air
deflector, and an open air space between the furnace door and the shell of the boiler,
so that the supply of fresh air passing through the air space will be deflected by
the bonnet onto the fuel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Lancaster in the Great Seal Patent Office on the 3rd
December 1879.
IN
THOMAS LANCASTER, of Liverpool, in the County of Lancaster.
"IMPROVEMENTS
AND RELATING TO STEAM BOILERS AND THEIR FURNACES AND FURNACE
Dooks."
My Invention relates to certain improvements in the construction and arrange-
ment of parts and furnaces of that class of steam boiler known as vertical cylindrical
high pressure boilers, and consists,―
Firstly. In constructing a vertical cylindrical boiler with a separate combustion
chamber placed over the fire box, and communicating therewith by means of vertical
tapered tubes of the Galloway type. The combination chamber is provided with
an uptake passing through the upper part or dome of the boiler and opening into
the chimney. The fire box may be provided with horizontal water tubes, connecting
the water spaces on cach side of the boiler.
Secondly. In providing vertical cylindrical boilers with what I term a super
dome, forming a steam chest above the boiler, and communicating with the boiler
by means of perforations in the ordinary dome or top plate thereof.
Thirdly. In providing the furnaces of vertical cylindrical boilers with a ring or
lining of terra cotta tiles or fire brick, extending upwards from the fire bars to a
line taken from the bottom of the furnace door or above. This ring or lining is
provided with vertical holes or passages all round, leading from the ashpit onto the
top of the furnace, so that currents of air may be induced to pass therethrough onto
the top of the fuel.
Fourthly. In providing the furnace door of boilers with an interior bonnet or air
deflector, and an open air space between the furnace door and the shell of the boiler,
so that the supply of frosh air passing through the air space will be deflected by the
bonnet onto the fuel.
The beforegoing being the nature, object, and purposes of my Invention, I will
now proceed to illustrate how my Invention may be practically applied, and describe
boilers constructed in accordance therewith, and for that purpose I have hereunto
attached a Sheet of Drawings illustrative of my Invention. The Drawings are
marked with letters and figures of reference corresponding with those in the following
explanation, like letters and figures being used to denote the same or corresponding
parts throughout the various views and Figures.
Figure 1 is a sectional elevation of a vertical cylindrical boiler constructed
according to my Invention.
Figure 2 is a section through A, B, Figure 1.
Figure 3 is a section through C, D, Figure 1.
Figure 4 is a sectional elevation of a further carrying out of my Invention.
Figure 5 is a part sectional end view of Figure 4.
My Invention consists,―
Firstly. In constructing a vertical cylindrical boiler A, as shown at Figure 1,
with a separate combustion chamber B placed over the fire box C, and communi-
cating therewith by means of vertical tubes D of the Galloway type. The com-
bustion chamber B is provided with an uptake E passing through the dome F of
the boiler, and leading into the chimney. The fire box C is provided with horizontal
water tubes G, connecting the water spaces on each side of the boiler.
My Invention further consists in providing vertical cylindrical boilers with what
I term a super dome H (see Figure 1). This super dome communicates with the
boiler by means of perforations J in the top plate of the boiler.
My Invention further consists in providing the furnaces of vertical cylindrical

page_text: ring or lining of fire brick K is provided with passages N all round, leading from
the ashpit P onto the top of the furnace or the side thereof, so that currents of air
may pass through the passages N onto the fuel in the fire grate R, the amount of
air being regulated by the adinission of air to the ashpit P.
In further carrying out my Invention I provide the furnace door T of the boiler
with an interior bonnet S, which acts as an air deflector. I also provide an open
air space U, so that the air passing in the direction of the arrows will enter the
furnace and be deflected by the bonnet S onto the fuel. The uptake E is provided
with a damper a worked by suitable rods and levers b, d, e.
Although I have described my Invention particularly as relating to a vertical
cylindrical boiler, it will be evident that it can also be applied to flat sided boilers
in manner as shown at Figures 4 and 5. In this case the horizontal tubes E corre-
spoud with the uptake E in Figure 1, and the air passage N at the back of the
furnace C corresponds with the air passages N round the furnace C in Figure 1.
Having thus described my Invention, and sufficiently illustrated the same to
enable any one skilled in the art to carry the same into operation, amongst the
advantages attendant upon my Invention I would mention strength of construction,
large heating surface, sinall and reduced water space, simplicity of construction,
perfect combustion, and economical consumption of fuel.
What I claim as my Invention is,―
First. The construction and arrangement of boiler and parts connected therewith
in manner as herein described, and such as illustrated at Figures 1, 2, and 3 of the
accompanying Drawings.
Second. The construction and arrangement of boiler and parts connected there-
with in manner as herein described, and such as illustrated at Figures 4 and 5 of
the accompanying Drawings.
Third. The construction and arrangement of furnace, having terra cotta tiles or
fire brick lining such as K, with passages such as N, as herein described and shown
at Figures 1 and 3 of the Drawings hereto annexed.
In witness whereof, I, the said Thomas Lancaster, have hereunto set my
hand and seal, this First day of December, in the year of our Lord One
thousand eight hundred and seventy nine.
TTOMAS
TINASIND
THOMAS (S.) I
TANG SUD