IMPROVEMENTS IN STEAM BOILERS
Year: 1852

page_text: LETTERS PATENT to George Thomas Selby, of Smethwick Tube
Works, Birmingham, in the County of Warwick, Engineer, for
the Invention of "IMPROVEMENTS IN STEAM BOILERS."
Sealed the 23rd March 1858, and dated the 30th October 1852.
PROVISIONAL SPECIFICATION left by the said George Thomas
Selby at the Office of the Commissioners of Patents, with his
Petition, on the 30th October 1852.
I, GEORGE THOMAS SELBY, of Smethwick Tube Works, Birmingham,
in the County of Warwick, Engineer, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN STEAM BOILERS " to be as
follows:-
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Thomas Selby in the Great Seal Patent
Office on the 29th April 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
GEORGE THOMAS SELBY, of Smethwick Tube Works, Birmingham, in
the County of Warwick, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of October, in the
year of our Lord One thousand eight hundred and fifty-two, in the
sixteenth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said George Thomas Selby, Her
special licence that I, the said George Thomas Selby, my executors,
administrators, and assigns, or such others as I, the said George
Thomas Selby, 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 law-
fully might make, use, exercise, and vend, within the United King-
lom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "IMPROVEMENTS IN STEAM BOILERS," upon the
condition (amongst others) that I, the said George Thomas Selby, by
an instrument in writing under my hand and seal, 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.
NOW KNOW YE, that I, the said George Thomas Selby, do hereby
declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the Drawings
liereunto annexed, that is to sny:
My Invention consists in the introduction of a chamber or chambers
between two or more sets of tubes or flues, for the better combustion of
the fuel, in such a position or positions that the gases and smoke, after
having passed through one set of tubes or flues and been divided, are
again brought into contact in the chamber and become remixed as they
pass on to another set or sets of tubes or flues. The Drawings hereunto
annexed represent different forms of boilers, shewing the manner in
which I place the combustion chamber in reference to the tubes or flues.
Figure 1, represents a front elevation of a marine boiler; Figure 2,
a longitudinal section; and Figure 3, a plan in section on the line of
the fire bars.

page_text: A, A, is the shell of the boiler; B, the furnace; C, C. the first set of
tubes or flues, which communicate from the furnace B, into the com-
bustion chamber D, D, in which the gases and smoke are remixed
before entering into the second set of flues E, E, which return along
the length of the boiler and open into the flue G, which is in commu-
nication with the funnel or chimney. The second set of tubes may be
made of a smaller diameter, and also of a greater length than the first
set, for the completion of the draught and combustion.
Figure 4, is a longitudinal section of a locomotive boiler, indicating
the position of the combustion chamber D, and the two sets of flues
or tubes C, and E; Figure 5, is a cross section on the line a, b, of
Figure 4; Figure 6, a similar section on the line c, d; Figure 7, is a
modification of the locomotive boiler represented in Figure 4, in which
the tube plate is inclined at an angle, and forms the roof of the furnace;
Figures 8, and 9, are cross sections respectively on the lines a, b, and
c, d, of Figure 7; Figure 10, is a longitudinal section; Figure 11, a
plan; Figure 12, a cross section on the line a, b, of Figure 10; and
Figure 18, a similar section on the line c, d, of a stationary boiler.
A, is the shell of the boiler, as before; B, B, two sets of furnaces,
which are both in communication with the first set of tubes; C, D, is the
combustion chamber; E, the second set of tubes; and F, the smoke
box, which is in connexion with the stack or chimney. Although I have
described and represented in the Drawings a combustion chamber as
applied to those forms of boilers shewn, yet it is obvious that such a
combustion chamber for the remixture of the smoke and gases may be
applied to all classes of boilers for the generation of steam in which tubes
are used. The combustion chambers may also be divided into two or
more distinct chambers, the division being formed into a water space or
otherwise.
And having now described the nature of my said Invention, and the
manner in which the same is to be performed, I declare that I claim as
my improvements in boilers,-
First, the introduction of a combustion chamber or chambers between
two sets of tubes or flues in the manner and for the purpose herein-
before described and represented in the Drawings hereunto annexed.

page_text: Second, I claim the use of two or more sets of tubes, of different
diameters and lengths, arranged in the manner and for the purpose
brein-before described and represented in the Drawings hereunto
annexed.
In witness whereof, I, the said George Thomas Selby, have here-
unto set my hand and scal, this Twenty-eighth day of April,
One thousand eight hundred and fifty-three.
GEORGE THOMAS SELBY. (L.S.)