IMPROVEMENTS IN STEAM AND OTHER BOILERS
Year: 1869

page_text: LETTERS PATENT to Thomas Green, of the Smithfield Iron Works,
Leeds, in the County of York, Engineer, for the Invention of
"IMPROVEMENTS IN STEAM AND OTHER BOILERS,"
Scaled the 8th June 1869, and dated the 1st January 1869.
PROVISIONAL SPECIFICATION left by the said Thomas Green at the
Office of the Commissioners of Patents, with his Petition, on the
1st January 1869.
I, THOMAS GREEN, of the Smithfield Iron Works, Leeds, in the County
of York, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN STEAM AND OTHER BOILERS," to be as follows:-
In the Specification of a former Patent granted to me on the 24th day
of May, 1866 (No. 1457), was described a vertical boiler with an internal
fire-box, which, if the boiler were n steam boiler, terminated just below
the water level, and if for heating water, just below the top of the boiler.
In these arrangements of boilers increased heating surface was obtained
by passing inclined tubes across the fire-box from opposite sides of the
[Poire Rd]

page_text: annular water space of the boiler. Now according to my present
Invention, in place of employing such inclined tubes passing across the
fire-box I place within the fire-box of such boilers, at a convenient
distance for heating, a tube or tubes bent into coils rising one above the
other from the bottom to the top, or any less or intermediate space of
the fire-box, the upper and lower ends of the coil being connected to the
annular water space of the boiler at or near its upper and lower ends
respectively. By this means a greater amount of heating surface is
obtained with fewer joints to be made.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Green in the Great Seal Patent Office on
the 28th June 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
GREEN, of the Smithfield 'Iron Works, Leeds, in the County of York,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of January, 'in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thomas Green, Her special licence
that I, the said Thomas Green, my executors, administrators, and
assigns, or such others as 1, the said Thomas Green, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exerciso, and
vond, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN STEAK AND OTHER BOILERS," upon the condition (amongst others)
that I, the said Thomas Green, my executors or administrators, by .an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent

page_text: NOW KNOW YE, that I, the said Thomas Green, do hereby-declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
In the Specification of a former Patent granted to me on the Twenty-
fourth day of May, One thousand eight hundred and sixty-six (No. 1457),
was described a vertical boiler with an internal fire-box which, if the
boiler were a steam boiler, terminated just below the water level, and if
for heating water, just below the top of the boiler. In these arrangements
of boilers increased heating surface was obtained by passing inclined tubes
across the fire-box from opposite sides of the annular water space of the
boiler. Now, according to my present Invention, in place of employing
such inclined tubes passing across the fire-box, I place within the fire-
box of vertical boilers having internal fire-boxes, as above described, a
tube or tubes bent into coils rising one above the other from the bottom
to the top, or any less or intermediate space of the fire-box, the upper
and lower ends of the coil being connected to the annular water space of
the boiler at or near its upper and lower ends respectively. By this
means a greater amount of heating surface is obtained with fewer joints
to be made, and a more perfect circulation of the water in the boiler is
obtained.
Figures I, 2, 3, and 4 of the Drawings hereunto annexed shew vertical
sections of hot water boilers constructed according to my Invention. In
these Figures a is the external shell of the boiler, which may be either
cylindrical, square, oval, or of other desired form; 6 is the internal
fire-box and o is the coil of pipe placed within it. In the arrangement
shewn at Figure 1 the coils of the pipe rise one above the other in a
conical form; the bottom end of the coil is connected to the lower end
of the fire-box, and the top end of the coil is connected to the top of the
fire-box. d is a cone of fire-brick to stop the draft of the fire from
passing up through the centre of the upper coil; the draft is thus
divided and dispersed amongst the tabes and around the sides of the
fire-box, so distributing the heat and also aiding in the consumption of
the smoke. By thus putting the upper and lower ends of the water
jacket in communication with one another by a pipe or pipes leading
through the fire-box a more perfect circulation of the water in the boiler
is maintained. In the modification of the boiler shewn at Figure 2 the
pipe is bent into a horizontal coil, and the outer end of the coil is

page_text: connected to the bottom of the fire-box, whilst the inner end of the coil
of pipe is carried up and is led into the exit pipe d leading from the top
of the water jacket. is a pipe passing across the fire-box; this pipe
both serves to support the coil c and also increases the heating surface of
the boiler. To the arrangement of boiler shewn at Figure 3, in addition
to placing within the fire-box a coil of pipe c, which is connected at one
end with the top of the water jacket and at the other with the lower
end of the water jacket, the upper and lower ends of the jacket are in
addition put in connection with one another, as shewn by other pipes f, f.
Figure 4 shews an arrangement of the boiler in which the pipes f, f, are
alone used for putting the upper and lower ends of the water jacket in
communication with one another.
In witness whereof, I, the said Thomas Green, have hereunto set
my hand and seal, this Nineteenth day of June, in the year of
our Lord One thousand eight hundred and sixty-nine.