IMPROVEMENTS IN STEAM-BOILERS to be as follows:
Year: 1885

page_text: I, THOMAS TOMLINSON Engineer 11, Vicarage Terrace Chester Road Sunderland
in the county of Durham do hereby declare the nature of my invention for
"IMPROVEMENTS IN STEAM-BOILERS to be as follows:-
"
A cylindrical shell is constructed, according to this invention, and is placed in
an upright position.
A semispherical firebox, with an opening in the top, is placed base downwards
within this shell; & fixed around the bottom to the lower part thereof. Above
this firebox a spherical combustion chamber is placed, with an opening in the top,
and also one in the bottom. The firebox, and combustion chamber are joined
together by a short neck-ring, fixed around the lower opening in the combustion
chamber, &, the upper opening in the firebox. The uptake pipe is taken from the
opening in the upper part of the combustion chamber, through the shell, to the
atmosphere. Water tubes, of comparatively large diameter, run across the com-
bustion chamber; & communicate with the water space of the boiler.
Fig. 1, is a vertical section of the boiler, and Fig. 2, a horizontal section through
the centre of the combustion chamber.
a. is the shell of the boiler. b. is the semispherical firebox. c. is the spherical
combustion-chamber. d. is the short neck-ring. e is the uptake. f. the furnace
mouth, &, g. the cross tubes.
Improvements in Steam Boilers.
I, THOMAS TOMLINSON of 11 Vicarage Terrace, Chester Road, Sunderland in the
County of Durham Engineer 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 applies specially to vertical boilers of the kind known as auxiliary
or doukey boilers but the mode of construction is applicable also to main boilers
within certain limits.

page_text: The shell is cylindrical and contains the furnace-which I prefer to make with
a domed or hemespherical top-from which a flue opens into a combustion chamber
above The form of the combustion chamber is a sphere and in it are cross water
tubes of comparatively large diameter (which may be either parallel or tapered) to
promote circulation and give increased evaporating surface-The uptake preferably
leads away from top of combustion chamber through water and steam space to top
of shell (which is also dome shaped) but may lead out of side of shell as may suit
the position of the chimney.
This boiler requires no stays as all the surfaces whether subject to bursting or
collapsing pressure are truly circular.
The space left between crown of furnace and underside of combustion chamber
is available to allow a man to enter for cleaning or repairing operations a man-hole
being provided for access.
DESCRIPTION OF DRAWINGS.
Figure 1. shews a vertical section of a boiler constructed according to my
invention as I prefer to carry it out and Figure 2. a plan on top of shell.
A is the shell of boiler with dome shaped top-B is the furnace with hemi-
spherical top opening by a throat piece C (formed by a neck ring) into the
combustion chamber D which is shewn a sphere, as I prefer, but may be made
slightly oblate or of larger radii at top and bottom than at sides or vice versa-
EE are water circulation tubes forming a cross from side to side on horizontal axes
but may be disposed at any angle to such axes.-The uptake F leads in this case
from combustion chamber to domed top of shell where it joins the chimney-G is
a man-hole for access into the annular space H formed by the junction of the
hemispherical top of furnace and bottom of combustion chamber and K is another
man-hole for access to the upper portion of boiler-The boiler is fitted with all
usual mountings and furnace gear.
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
The construction and use of vertical steam boilers consisting of an outer cylin-
drical shell containing a furnace with hemispherical top connected with a spherical
combustion chamber, with or without circulation tubes therein, and communicating
by a flue or uptake to chimney with the objects set forth substantially as described
and shewn.
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