Year: 1886

page_text: Date of Application, 31st Mar., 1886.
Complete Left, 31st Dec., 1886.
Complete Accepted, 1st Feb., 1887.
I, THOMAS RIDLEY OSWALD, of Woolston, in the County of Southampton, Ship-
builder and Engineer, do hereby declare the nature of this invention to be as
follows:-
+4
This invention has for object improvements in marine and other boilers and relates
to boilers of the vertical type.
A boiler, according to this invention, las an outer shell, surrounding a furnace or
combustion chamber. The shell and the furnace or chamber are eacli egg-ended or
hemispherical at the upper extremity, and are connected at the lower ends by a ring
of U shaped or channel section. Between the shell and the upper part of the furnace
or combustion chamber there are fixed a number of tubes which both act as stays, and
provide exits for the hot gases, which after playing within the furnace or chamber, pass
through these tubes, and come in contact with the outer surface of the shell. When
they emerge from the tubes they enter an annular flue formed round the boiler and rise
through it to the uptake.
To economise the waste heat from this flue and to prevent its radiation into the
stokehold there is placed around it and around the uptake a casing with an intervening
air space. Through this space air is drawn down to feed the fire, either by natural or
forced draught.
The boiler is carried on brackets or supports, and the grate is placed beneath it in
such a position that the entire heating surface may be utilized.
Cross tubes are likewise placed in the lower part of the combustion chamber to
increase the heating surface. The combustion chamber may be of corrugated plates.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C..
Agent for the Applicant.

page_text: .
I THOMAS RIDLEY OSWALD, of Woolston, in the County of Southampton, Ship-
builder and 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 has for object improvements in marine and other boilers and relates
to boilers of the vertical type.
A boiler, according to this invention, has an outer shell, surrounding a furnace, fire-
box, or combustion chamber. The shell and the furnace fire box or combustion chamber
are each egg-ended or hemispherical at the upper extremity, and are connected at the
lower ends by a ring of Ụ shaped or channel section. Between the shell and the
furnace fire-box or combustion chamber, there are fixed a number of tubes, which both
act as stays, and provide exits for the products of combustion and hot gases, which, after
playing within the furnace fire-box or combustion chamber, pass through these tubes,
and come in contact with the outer surface of the shell. When they emerge from the
tubes they enter an annular flue formed round the boiler and rise through it to the
uptake. To economise the waste heat from this flue and to prevent its radiation into
the stokehold there is placed around it and around the uptake a casing with an inter-
vening air space. Through this space air is drawn down to feed the fire, either by
natural or forced draught.
The boiler is carried on brackets or supports, and the grate is placed beneath it in
such a position that the entire heating surface may be utilised.
Cross tubes are likewise placed in the lower part of the combustion chamber to
increase the heating surface. The combustion chamber may be of corrugated plates.
Water circulates through the cross tubes, which will be hereafter called water tubes
for distinction.
The accompanying drawing illustrates in vertical section the construction of a boiler
according to this invention made circular in horizontal section.
1. is the outer or boiler shell and 2 the furnace, fire-box or combustion chamber
hereafter called the fire-hox; each is formed at the upper end of an egg ended or
hemispherical shape. 3 is a U shaped ring connecting their lower ends and forming
the bottom of the boiler. 4, 4, are tubes fixed in the boiler shell and in the wall of the
fire-box and serving inter alia as stays therefor. Through these tubes products of
combustion and hot gases pass from the fire box to an annular flue 5 formed by a
casing 6 surrounding the boiler. The products of combustion and gases rise through
the flue 5 to the uptake 7 or chimney. 8 is a second casing surrounding the annular
casing 6 of the flue 5 and uptake so as to leave an annular air space 9 between the
two casings. Through this space 9 air to support combustion is caused to pass to the
fire by natural or forced draught and during its passage, it becomes heated by heat
escaping with the products of combustion and gases through the flue 5. 10 is a
chamber or collector into which the air passes before reaching the fire and whence it
is fed in any convenient way (such as by drawing from the chamber and forcing under

page_text: the fire bars) to the fire as will be readily understood. II is a portable lining of
refractory material such as fire-clay, surrounding the casing 6 for a part of its height.
An independent stand (not shown) supports the boiler. 13 is the fire grate arranged
below the level of the bottom of the boiler in such a way that the entire heating
surface of the boiler may be utilized; it is supported by the same stand as the boiler.
14, 14 are water tubes traversing the fire box and affording additional heating surface.
Any convenient number of stay tubes 4 may be provided and they may be arranged
at any suitable distances apart circumferentially of the boiler. Instead of the products
of combustion passing wholly through the fire box and tubes 4 they can be so divided
that part shall pass in the direction just mentioned and part directly through the
Alue 5.
With the arrangement described it will be understood that a large amount of
efficient heating surface is obtained within a boiler of simple construction occupying
a comparatively small space. Besides the surface presented by the fire-box and tubes,
the outer surface of the boiler shell is also by my arrangement, made available for
transmitting heat to the contents of the boiler. The construction is such moreover
as to afford great strength and the various parts are readily accessible.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, I declare that what I claim is:-
:-
1. Connecting the boiler shell 1, to the furnace fire-box or combustion chamber
substantially in the manner described.
2. The combination with the boiler shell and furnace fire box or combustion chamber
of the connecting tubes arranged to serve as stays and for conducting products of
combustion and hot gases to the outer flue and uptake and water tubes traversing the
furnace fire-box or "combustion chamber the arrangement being substantially such
as described.
3. In a boiler of the kind described the arrangement of the fire bars or grate below
the level of the bottom of the boiler as specified.
4. The combination with the furnace fire-box or combustion chamber, boiler shell,
and tubes connecting them of the casing 6 the arrangement being such that products
of combustion and hot gases are caused to act upon the outer surface of the boiler
shell utilizing the same as heating surface additional to that afforded by the wall of the
furnace fire box or combustion chamber and tubes substantially as described.
5. Constructing marine and other boilers substantially as described with reference
to the appended drawing.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant."