IMPROVEMENTS IN FLUES AND FURNACES OF STEAM BOILERS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I SAMUEL WEBSTER of Prince Edwin Street Liverpool, in the County of
Lancaster, Boiler Maker do hereby declare the nature of my said invention for
"IMPROVEMENTS IN FLUES AND FURNACES OF STEAM BOILERS" to be as follows:-
The invention relates mainly to internally fired boilers and has for its object to
provido flues and furnace chambers so made as to possess great strength without
extra thickness of metal, and have the advantages of being durable easily and
securely attached to and withdrawn from the shell of the boiler, of allowing for
expansion and contraction, and of being readily formed by simple machinery at
small cost.
The invention consists essentially in making flues and furnaces for steam boilers
of iron or steel rolled or otherwise shaped so as to form a hollow tube circular
eliptical or the like in cross section of increasing diameter towards the centre of its
length and with enlarged ends adapted to be rivetted to the shell of the boiler or
to one or more similarly constructed flues or furnaces.
In a simple modification one of the enlarged ends of a furnace and flue under
my invention is rivetted to the front portion of the shell of a steam boiler and the
other end to the back portion of the shell thereof; the firegrate being within the
said flue and furnace at one end and the combustion chamber or smoke stack at
the other end thereof.

page_text: "The invention consists essentially in making a-flue and-furnace for steam boilers
of iron or steel rolled or otherwise shaped so as to form a hollow tube circular
elliptical or the like in cross_section of increasing diameter towards the centre of
its length.
The said flue-and-furnace is enlarged at one or both ends and is rivetted to the
shell of the boiler or to one or more similarly constructed flues or furnaces in such
manner that-the-said-furnace-and-flue-may-be-removed from the shell-of_the_boiler
when necessary.
DESCRIPTION OF THE DRAWINGS.
In Fig 1 a is a longitudinal section of a flue and furnace under my invention
which is circular or elliptical or of like shape in cross section which is curved
longitudinally so as to be of greater diameter towards the centre of its length and
which is enlarged at each end into flanges b. The flanges b are rivetted to the
front and back plates of the boiler shell c so that the said flue and furnace can be
removed when desirable d fire grate...
In Fig 2 the flue is made conical instead of curved in outline and the enlarged
end flanges are parallel to instead of being at right angles to the longitudinal axis
of the flue.
In Fig 3 a furnace is shown with one end only enlarged.
In Fig 4 the flue or furnace has both ends enlarged the flange at one end being
longitudinal and at the other transverse.
Fig 5 shows a furnaco for marine boilers in which one ende is made in part with
transverse and in part with a longitudinal flange to allow of its being connected to
a tube plate and smoke box.
Fig 6 shows two flues connected together,
Fig 7 shows a flue similar to Fig 6 but in one piece.
Fig 8 shows two modifications of a flue or furnace in which the enlargement at
the ends is made by attached pieces f.

page_text: It will be obvious that flues and furnacos having the improvements set forth
under my invention may be made in many modifications and that they may be
used in stationary locomotive or marine boilers either as flues furnaces or both.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
A flue and furnace of increased diameter from the ends towards the centre and
with means for attachment to the boiler substantially as herein set forth.