Improvements in or relating to Steam Boilers.
Year: 1896

page_text: Date of Application, 21st Mar., 1896
Complete Specification Left, 21st Sept., 1896-Accepted, 24th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Boilers.
We, GEORGE ROLLO and MALCOLM MACFARLANE ROLLO, of Fulton Engine
Works, Liverpool, in the County of Lancaster, Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to steam boilers and has been designed more especially for
use in connection with upright donkey boilers, though we wish it to be distinctly
understood that we do not confine ourselves to any particular kind of boiler, as it
may be applied to other boilers besides upright donkey boilers.
In carrying our invention into effect, a pear shaped pot is placed in the fire-box
having a pipe at its bottom led down through the fire, and having a cleaning flange
fitted at the lower end to which is fitted the feed connection. This is led outside
the shell and there connected to the feed check valve. Between the top of the pot
aforesaid and the crown of the fire-box, a number of tubes are placed for conveying
the water from the pot upwards to the upper portion of the boiler above the fire box
crown, and at the sides of the pot large or small tubes are inserted to connect it to
the water spaces at the sides, one being of such dimensions as to allow a man
getting inside through the man-hole placed in the shell, so as to enable him to do
any cleaning or repairing, these side tubes being preferably arranged so as to slope
somewhat in a downward direction.
It will be seen from the above description that the feed water entering from the
bottom is first heated by the fire, and in its upward passage into the pot a motion"
is caused which drags the otherwise stagnant water at the bottom of the water space into
the pot, where it is given an upward motion owing to the heating surface in the pot
and the water tubes in the crown. On reaching the top it will fall down into the
water space as described until evaporated into steam. In other words an induced
current of water is set up in the boiler, complete circulating effected, and deposit
reduced to a minimum. By the use of the tubes connecting the top of the pot
with the crown of the fire-box greatly increased heating surface is obtained with
high evaporative efficiency.
We have described our invention as applied to donkey boilers, but we wish it to be
understood that we do not confine ourselves to the exact arrangement described, as
once given the general idea alterations may be made without departing from the
principle of the invention.
0011
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicants.
Improvements in or relating to Steam Boilers.
We, GEORGE ROLLO and MALCOLM MACFARLANE ROLLO of Fulton Engine Works,
Liverpool, in the County of Lancaster, Engineers, do hereby declare the nature of
this invention and in what manner the saine is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to steam boilers and has been designed more especially for

page_text: use in connection with upright donkey boilers, though we wish it to be distinctly
understood that we do not confine ourselves to any particular kind of boiler, as it may
be applied to other boilers besides upright donkey boilers.
The invention will be understood from the following description, reference being
had to the accompanying drawings, in which:
Figure 1 is a sectional elevation of the boiler;
Figure 2 a sectional plan, one half being a section through the tubes E, and the
other a section taken above the crown of the fire-box B;
Figures 3, 4, 5, 6, 7 and 8 similar views showing slight modifications to suit special
conditions or customers' requirements.
Referring to these figures.-A is a pear-shaped pot or receptacle placed in the fire-
box B, having a neck or pipe to which is fitted a feed connection D passing down
through the fire. This is led outside the shell B' and there connected to the feed
check valve. Between the top of the pot A aforesaid and the crown of the fire-
box B, a number of tubes E are placed for conveying the water from the pot upwards
to the upper portion F of the boiler above the fire-box crown, and at the sides of the
pot large or small tubes G are inserted to connect it to the water spaces at the sides,
one being of such dimensions as to allow of a man getting inside through
a manhole
placed in the shell, so as to enable him to do any cleaning or repairing, these side
tubes being preferably arranged diagonally so as to slope somewhat in a downward
direction. Hare the fire-bars, I the fire-box stays and J the smoke exit leading to
the uptake.
The constructions set forth in Figures 3 to 8 inclusive are substantially similar to
that depicted in Figures 1 and 2, but slightly modified to suit special conditions or
customers' requirements; thus in Figures 3 and 4 the boiler has a semi-globular top
and the smoke and products of combustion pass to the uptake K through the smoke
tubes J leading from the fire-box B through the water space L. Figures 5 and 6
show our boiler with a central upright uptake while the boiler depicted in Figures 7
and 8 is practically identical with that shown in Figures 3 and 4 except that it has a
nearly flat top instead of a semi-globular one.
It will be obvious that instead of providing straight tubes E, pipe coils might be
provided leading from the pot to the crown.
It will be seen from the above description that the feed water entering from the
bottom is first heated by the fire, and in its upward passage into the pot A a motion
is caused which drags the otherwise stagnant water at the bottom of the water
space H into the pot, where it is given an upward motion owing to the heating
surface in the pot and the water tubes E in the crown. On reaching the top it will
fall down into the water space as described until evaporated into steam. In other
words an induced current of water is set up in the boiler, complete circulating
effected, and deposit reduced to a minimum. By the use of the tubes connecting the
top of the pot with the crown of the fire-box greatly increased heating surface is
obtained with high evaporative efficiency.
We have described our invention as applied to donkey boilers, but we wish it to be
understood that we do not confine ourselves to the exact arrangement described,
as once given the general idea alterations may be made without departing from the
principle of the invention.
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. The improvement in boilers, which consists in arranging inside the fire-box, a
pot or receptacle for water, connected at its bottom with the feed-water supply, in
combination with tubes or pipes for conveying water from the lower part of the
boiler to the pot, and from the pot to. the upper portion of the boiler above the
fire-box crown, substantially as and for the purpose described.
2. In boilers, arranging the pot or'receptacle and the tubes or coils in the manner
described, whereby an induced current of water is set up in the boiler, complete

page_text: circulation effected, and deposit thereby reduced to a minimum, substantially as
set forth.
3. The general combined arrangement and construction of parts substantially as
described.
Dated this 19th day of September 1896.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.