IMPROVEMENTS IN STEAM BOILERS
Year: 1881

page_text: LETTERS PATENT to Edward Crompton and James Taylor Cochran, both of
Birkenhead, in the County of Chester, for an Invention of "IMPROVEMENTS
IN STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said Edward Crompton and
James Taylor Cochran at the Office of the Commissioners of Patents on the
18th October 1881.
EDWARD CROMPTON and JAMES TAYLOR COCHRAN, both of Birkenhead, in the
County of Chester. "IMPROVEMENTS IN STEAM BOILERS."
This Invention is a modification of the system of vertical multitubular boilers
patented by us on the 23rd day of February 1878, No. 770, and enables the
arrangement of horizontal flue tubes in vertical cylindrical shells to be applied to
boilers of any size, even the very largest.
In this arrangement we employ a horizontal cylindrical furnace or furnaces as
now ordinarily used for marine boilers. The shell of the boiler we make preferably
hemispherical at the top, and the bottom we make preferably of a quarter of a
sphere and a half cylinder or of a quarter of a sphere and a half cylinder with a
rectangular portion superimposed. The vertical cylindrical part of the shell rises
directly from the quarter sphere and over the half cylinder or rectangular portion
above the half cylinder from a plate which partly forms the top of the half
cylinder or rectangular portion above.
One end of the half cylinder is formed of a flat plate, in which are fixed the
mouth or mouths of the furnace or furnaces in the usual manner. The furnace or
furnaces may run direct into the combustion chamber or chambers, or they may be
formed with dished or hemispherical ends and with flue pipes leading into the
combustion chamber or chambers.
The foregoing applies to what are known as single ended boilers. In the case
of double ended boilers the vertical cylindrical shell is superimposed on a half
cylinder or half cylinder with rectangular portion added above. This half cylinder
has flat ends into which the furnace mouths are secured as usual; there is one or

page_text: more central combustion chambers, and the furnaces may be constructed in either
of the ways mentioned above as applicable for single ended boilers.
We also construct our vertical cylindrical boilers with hemispherical tops and
bottoms, and with a furnace or furnaces of the horizontal cylindrical shape as now
ordinarily used for marine purposes. These furnaces may when the boiler is
arranged to be fired at each side extend right across the boiler, opening in the
middle into one or more combustion chambers, or the furnaces may be connected to
the combustion chamber or chambers by suitable flue pipes.
In the case of boilers fired at one side only, the furnace or furnaces extend as far
as the combustion chamber or chambers, or extend so far that they may be connected
with a suitable flue pipe.
In the boilers arranged to be fired at each side there is preferably one or more
combustion chambers placed centrally in those fired at one side, only the combustion
chamber or chambers are preferably placed at the side of boiler away from external
mouth of furnace.
In all these boilers the furnaces may be made conical or any other shape according
to requirements.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Crompton and James Taylor Cochran in the Great Seal
Patent Office on the 18th April 1882.
EDWARD CROMPTON and JAMES TAYLOR COCHRAN, both of Birkenhead, in the
County of Chester. "IMPROVEMENTS IN STEAM BOILERS."
This Invention is a modification of the system of vertical multitubular boilers
patented by us on the 23rd February 1878, No. 770, and enables the arrangement
of horizontal flue tubes in vertical cylindrical shells to be applied to boilers of any
size, even the very largest.
In this arrangement we employ a horizontal cylindrical furnace or furnaces as
now ordinarily used for marine boilers. The shell of the boiler we make preferably
hemispherical at the top, and the bottom we make preferably of a quarter of a
sphere and a half cylinder, or of a quarter of a sphere and a half cylinder with a
rectangular portion superimposed. The vertical cylindrical part of the shell rises
directly from the quarter sphere and over the half cylinder or rectangular portion
above the half cylinder, from a plate which partly forms the top of the half cylinder
or of the rectangular portion above.
One end of the half cylinder is formed of a flat plate, in which are fixed the
mouth or mouths of the furnace or furnaces in the usual manner. The furnace or
furnaces may run direct into the combustion chamber or chambers, or they may be
formed with dished or hemispherical ends and with flue pipes leading into the
combustion chamber or chambers. The back of the combustion chamber may in
some cases be made of brickwork. The foregoing applies to what are known as
single ended boilers.
In the case of double ended boilers the vertical cylindrical shell is superimposed
on a half cylinder, or half cylinder with rectangular portion added above. This
half cylinder has flat ends, into which the furnace mouths are secured as
usual.
There are one or more central combustion chambers, and the furnaces may be
constructed in either of the ways mentioned above as applicable for single ended
boilers.
We also construct our vertical cylindrical boilers with hemispherical tops and
bottoms, and with a furnace or furnaces of the horizontal cylindrical shape, as now
ordinarily used for marine purposes. These furnaces may when the boiler is
arranged to be fired at each side extend right across the boiler, opening in the
middle into one or more combustion chambers, or the furnaces may be connected to
the combustion chamber or chambers by suitable flue pipes.
In the case of boilers fired at one side only the furnace or furnaces extend as far
as the combustion chamber or chambers, or extend so far that they may be connected
with a suitable flue pipe.
In the boilers arranged to be fired at each side there is preferably one or more
combustion chambers placed centrally. In those fired at one side only the
combustion chamber or chambers are preferably placed at the side of boiler away
from external mouth of furnace.
In all these boilers the furnaces may be made conical or any other shape
according to requirement, and in each case the flue tubes are fixed by means of a
flat tube plate or tube plates flanged and rivetted to the shell.
The various arrangements specified above are explained by the sketches on Sheet
annexed hereto.
They are as follows:-
--
Fig. 1, section of single ended vertical cylindrical boiler with hemispherical top,
horisontal furnace, bottom formed of quarter sphere and half cylinder, horizontal

page_text: Fig. 2, cross section of Fig. 1.; Fig. 3, plan of Fig. 1; Fig. 4, section of vertical
cylindrical boiler with hemispherical top and bottom, horizontal furnace, horizontal
tubes, and flanged tube plate. In these and in the succeeding views the horizontal
cylindrical portion might, if desired, be arranged to end in a line with the tube
plate instead of projecting beyond. Fig. 5, cross section of Fig. 4; Fig. 6, plan of
Fig. 4; Fig. 7, section of double ended vertical cylindrical boiler with hemispherical
top, horizontal furnaces, and bottom formed of half cylinder, horizontal tubes, and
flanged tube plates; Fig. 8, cross section of Fig. 7; Fig. 9, plan of Fig. 7.
The various parts referred to in Specification are marked as under in the
Drawings: -
Furnaces, A; hemispherical tops, B; hemispherical bottom, C; bottoms, partly
spherical, partly semi cylindrical, D; bottom, semi cylindrical, E; flanged tube
plates, F; combustion chambers, G; tubes, H.
Having now described our Invention, and the best modes known to us of
carrying it into effect, we wish it to be understood that what we believe to be
new and desire to protect under the hereinbefore in part recited Letters
Patent is,-
In vertical boilers, the combination with the vertical cylindrical shell and
horizontal or nearly horizontal flue tubes of a bottom (containing the furnace or
furnaces) formed of a horizontal or slightly inclined semi cylinder or hemisphere, or
combination of these shapes.
In witness whereof, I, the said James Taylor Cochran, for and on behalf of
myself and the said Edward Crompton, have hereunto set my hand and
seal this 17th day of April, in the year of our Lord 1882.
Witness,
WM. P. THOMPSON,
Patent Agent,
Liverpool and London.
JAMES T. COCHRAN. (L.S.)