An Improved Steam Boiler.
Year: 1891

page_text: Date of Application 22nd Jan., 1891
Complete Specification Left, 21st Oct., 1891-Accepted, 21st Nov., 1891
PROVISIONAL SPECIFICATION.
An Improved Steam Boiler.
I, GEORGE ALFRED NEWALL, of Saint Philips Ironworks, in the City and
County of Bristol, Engineer, do hereby declare the nature of this invention to be
as follows:-
--
The improved boiler in which this invention consists is circular in plan and is
fitted with a fire-box or combustion chamber which is contained within the shell
and is either conical or cylindrical. Towards the top the said fire-box or com-
bustion chamber is fitted with conical tubes which radiate therefrom and are.
secured at their outer and larger ends to a tube plate, either conical or cylindrical,
from which springs a dome which forms the top of the boiler. At the lower end
the tube plate is rivetted or otherwise united to a base plate to which is rivetted
the lower part of the boiler shell, either concentric with the fire-box or combustion
chamber, or formed as water legs or tubes around a fire-box casing. At their
outer ends the conical tubes communicate with a smoke-box which is carried round
the tube plate and the base plate aforesaid..
This smoke-box discharges by uptakes leading to a common chimney or central
funnel. In a boiler constructed as above described an extended fire-grate area is
obtained and an increased and more effective heating surface in proportion to the
weight of the boiler is afforded, and the form of the boiler gives greater strength.
The provision of conical tubes ensures an easy draught and the tubes being below
the crown of the fire-box or combustion chamber, deposits from the tubes are not
received thereon. All the parts are readily accessible and, there being no confined
water spaces, liability to priming is reduced.
Dated this 21st day of January 1891
NICHOLAS WATTS,.
Bristol Bank Buildings, Bristol,.Agent.
COMPLETE SPECIFICATION.
An Improved Steam Boiler.
I, GEORGE ALFRED NEWALL, of Saint Philips Ironworks, in the City and
County of Bristol, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
The improved boiler in which this invention consists is circular in plan and is
fitted with a fire-box or combustion chamber which is contained within the shell
and is preferably conical, but may be cylindrical. Towards the top the said fire-
box or combustion chamber is fitted with conical tubes which radiate therefrom and
are secured at their outer and larger ends to a tube plate from which springs a
dome which forms the top of the boiler. At the lower end the tube plate is rivetted
or otherwise united to a base plate to which is rivetted the lower part of the boiler
shell. At their outer ends the conical tubes communicate with a smoke-box which
is carried round the tube plate and the inclined base plate aforesaid. This smoke-
box discharges by uptakes leading to a common chimney or central funnel.
Referring to the accompanying sheet of drawings,
Fig. 1 represents a part elevation and part vertical section of a boiler constructed
and fitted in accordance with this invention.
Fig. 2 is a part plan and part horizontal section on the line a, a, Fig. 1.
The combustion chamber which in the boiler illustrated is conical, but may be

page_text: cylindrical, is contained within the boiler shell and is fitted with conical tubes b
which radiate therefrom and are secured at their outer ends in the tube plate c.
From the upper part of the tube plate e springs the dome d which constitutes the
boiler top. At the lower end the tube plate is rivetted or otherwise united to a
base plate.e to which is rivetted the lower part of the boiler shell. At their outer
ends the tubes communicate with a smoke-box carried round the tube plate c
and the base plate e. The smoke-box f discharges by uptake flues 9 into a common
chimney or central funuel h. The fire bars are arranged, as shown, at the lower
end of the combustion chamber a. The boiler is fitted with suitable fire door or
doors and with man and other holes for giving access to the interior.
In a boiler constructed in accordance with this invention, as above set forth and
shown in the accompanying drawing, an extended fire-grate area is obtained and an
increased and more effective heating surface in proportion to the weight of the
boiler is afforded. The rounded shape of the boiler gives greater strength. The
provision of conical fire tubes such as ensures an easy draught and as they are
situated clear of the crown of the combustion chamber or fire-box a the crown of
the latter does not receive deposits of scale from them.
All the parts are readily accessible and there being no confined water spaces,
liability to priming is minimised.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A steam boiler, of approximately circular form in plan, combining in its con-
struction a combustion chamber such as a, either conical or cylindrical, a dome-
shaped top such as d, an annular smoke-box such as f surrounding the combustion
chamber, and conical fire tubes such as radiating from the said chamber and so
situated as to prevent deposits of scale from falling on to the crown of the com-
bustion chamber, the said tubes having their ends of smallest diameter in the wall
of the combustion chamber and their widest ends in a tube plate such as c,
substantially as hereinbefore described with reference to the accompanying sheet
of drawings.
Dated this 20th day of October 1891
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, Agent.