An Improved Construction of Steam Boiler.
Year: 1890

page_text: Date of Application. 24th Mar., 1890
Complete Specification Left, 24th Dec.. 1890-Accepted, 24th Jan., 1891
PROVISIONAL SPECIFICATION.
An Improved Construction of Steam Boiler.
We, WILLIAM HORNSBY and ROBERT EDWARDS, both of Spittlegate Iron Works,
Grantham, in the County of Lincoln, Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in the construction of externally fired
tubular steam boilers.
In carrying out our invention we construct our tubular boiler of two cylindrical or
approximately cylindrical shells of different diameters placed end to end but
eccentrically; end plates are provided at the outer ends of the two shells and on the
other end of the larger shell, where not covered by the smaller shell, and tubes are
arranged between the said end plates. At the outside ends of the boiler we
advantageously arrange smoke boxes forming continuations of the shells or they may
be arranged in any other suitable manner.
The boiler is placed longitudinally and a furnace is provided under that part of the
smaller shell which projects from the larger, the sides and ends of the furnace being
constructed of fire-bricks or fire resisting material held together by suitable means.
The products of combustion are taken through tabes in the lower part of the larger
shell, thence through the smoke box at the end and returned through the tubes in the
upper part of the boiler.
Dated the 24th day of March 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improved Construction of Steam Boiler.
We, WILLIAM HORNSBY and ROBERT EDWARDS, both of Spittlegate Iron Works,
Grantham, in the County of Lincoln, Engineers, do hereby declare the nature of
this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement
--
This invention relates to improvements in the construction of externally fired
tubular steam boilers.
9
In carrying out our invention we construct our tubular boiler of two cylindrical or
approximately cylindrical shells of different diameters placed end to end but
eccentrically end plates are provided at the outer ends of the two shells and on the
other end of the larger shell, where not covered by the smaller shell, and tubes are
arranged between the said end plates. At the outside ends of the boiler we
advantageously arrange smoke boxes forming continuations of the shells or they may
be arranged in any other suitable manner.
The boiler is placed longitudinally and a furnace is provided under that part of the
smaller shell which projects from the larger, the sides and ends of the furnace being
constructed of fire-bricks or fire resisting material held together by suitable means.
The products of combustion are taken through tubes in the lower part of the larger
shell, thence through the smoke box at the end and returned through the tubes in the
upper part of the boiler.
In order to enable our invention to be fully understood and carried into practice we
will describe the same by reference to the accompanying drawing, in which
Figures 1 and 2 illustrate in longitudinal section and end view a boiler constructed
according to our invention without any external brickwork setting.

page_text: Figures 3 and 4 are similar views illustrating the same boiler with brickwork
Botting.
Figures 5 and 6 illustrate in longitudinal and transverse sections respectively a
boiler with external brickwork setting cased with iron, the casing being carried under
the fire bars to form the ash pit.
Similar letters in all the figures represent similar parts.
A is the cylindrical shell of smaller diameter and B the cylindrical shell of larger
diameter, the two shells being placed end to end but eccentrically as shown. H is the
plate connecting the two shells A and B together and forming a tube plate for one
end of the shell B. F is the other end plate of the shell B and forms its other tube
plate. The plate F also carries the tubes from the end tubo plate E of the shell A.
C is a smoke box arranged outside the end of the shell B and D is another smoke
box outside the end of the shell A.
These smoke boxes are provided with firebrick linings as required.
N, N are the fire bars placed under the shell A as clearly shewn in Figures 3, 5
and 6; L, L represent à lining of firebricks (or other suitable lining or casing)
arranged at the sides and ends of the furnace to retain the fire; the products of
combustion pass through the short lower tubes into the smoke box and then
through the upper longer tubes into the smoke box D and thence to a flue or chimney
as required.
In Figures and 6 we shew the ash pit K and sides of the firebrick casing
formed of iron so as to more readily make the boiler portable though it is not
necessary to enclose the ash pit in to effect this as the sides and ends of the furnace
can be cased only.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is :-
(1.) Constructing tubular boilers with two cylindrical shells of different diameters
attached together end to end eccentrically and with suitable tube plates arranged at
their ends having tubes placed between them, the furnace being arranged under the
smaller shell and the products of combustion being taken through the tubes in each
shell to a suitable flue or chimney, substantially as herein before described.
(2.) The manufacture and use of the improved longitudinal tubular steam boiler
constructed and arranged substantially as herein before described and illustrated in the
accompanying drawing.
Dated the 24th day of December 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.