Im- PROVEMENTS IN STEAM GENERATORS AND IN THE FORMATION OF THE INTERNAL FLUES OF THE SAME
Year: 1875

page_text: LETTERS PATENT to George Plant, of Miles Platting, Manchester, in
the County of Lancaster, Boiler Maker, for the Invention of “ Im-
PROVEMENTS IN STEAM GENERATORS AND IN THE FORMATION OF THE INTERNAL
FLUES OF THE SAME.
"
Sealed the 16th October 1875, and dated the 27th April 1875.
PROVISIONAL SPECIFICATION left by the said George Plant at the
Office of the Commissioners of Patents, with his Petition, on the
27th April 1875.
I, GEORGE PLANT, of Miles Platting, Manchester, in the County
of Lancaster, Boiler Maker, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM GENERATORS AND IN THE FORMATION
OF THE INTERNAL FLUES OF THE SAME," to be as follows:-
My Invention relates in the first place to the description of steam
In the said
generator now well known as the Galloway boiler.
generator the hinder portion of the internal flue is made of an elliptical,
or nearly of an elliptical form, and has conical water tubes extending

page_text: across it at intervals. By reason of the said form of the flue the space
between the shell of the flue and the lower part of the shell of the
boiler is very limited, so that access cannot readily be had to this space
for the purposes of cleaning, inspection, and repairs. To remedy this
defect I reverse the curve of the lower side of the flue, that is to say, I
make the floor of the flue convex instead of concave, thereby increasing
the area of the aforesaid space.
A second part of my Invention is applicable to the aforesaid descrip-
tion of boiler, and also to other boilors having internal flues. According
to this part of my Invention I flanch the edges of the rings which are
to be united to form the internal fluo or each internal fluo outwardly,
and I bring together the flanches on two rings which are to be united,
and interpose a flat ring between the said flanches, and I weld together
the edges of the said flanches; and the said flat ring, the parts to bo
welded having been heated to a suitable degree.
I prefer to make cach flanch of a form curving outwardly from the
hode of the ring to the nart which is to be welded
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Plant in the Great Scal Patent Office
on the 27th October 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
PLANT, of Miles Platting, Manchester, in the County of Lancaster,
Boiler Maker, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of April, in the year
of our Lord One thousand eight hundred and seventy-five, in the
Fortieth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Plant, Her special licence, that
I, the said George Plant, my executors, administrators, and assigns, or
such others as I, the said George Plant, 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, exercise, and vend, within the

page_text: "
United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN STEAM GENERATORS AND IN
THE FORMATION OF THE INTERNAL FLUES OF THE SAME,'
upon the condition
(amongst others) that I, the said George Plant, my executors or admi-
nistrators, by an instrument in writing under my, or their, or one of
their hands and scals, should particuarly 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 Scal
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 Plant, 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 (and accompanying Drawings), that is to say :-
My Invention relates in the first place to the description of steam
generator, now well known as the "Galloway boiler." In the said
generator the hinder portion of the internal Blue is made of an elliptical,
or nearly of an elliptical form, and has conical water tubes extending
across it at intervals. By reason of the said form of the flue the space
between the shell of the fluc and the lower part of the shell of the
boiler is very limited, so that access cannot readily be had to this space
for the purposes of cleaning, inspection, and repairs. To remedy this
defect I reverse the curve of the lower side of the fluc, that is to say, I
make the floor of the flue convex instead of concave, thereby increasing
the area of the aforesaid space.
A second part of my Invention is applicable to the aforesaid descrip-
tion of boiler, and also to other boilers having internal flues. According
to this part of my Invention I flanch the edges of the rings which are
to be united to form the internal flue or cach internal flue outwardly,
and I bring together the flanches on two rings which are to be united,
and interpose a flat ring between the said flanches; and I weld together
the edges of the said flanches and the said flat ring, the parts to be
welded having been heated to a suitable degree.
And in order that my said Invention may be fully understood, I
have appended hereunto a Sheet of Drawings marked with letters of
reference, to which Drawings I will now refer.

page_text: "
Fig. 1 represents a vertical cross section of a boiler constructed with
a flue formed in accordance with the first part of my Invention. In the
said Figure a represents the shell of the internal flue, and b, b, vertical
Galloway tubos," which are fixed in and across the said flue in the
usual manner. The said vertical tubes are arranged in alternate cross 5
rows containing three tubes and two tubes, but this arrangement may
be varied.
Fig. 2 illustrates a modification in the arrangement of the said tubes.
In this example rows of two tubes alternate with single central tubes
and two side pockets or water chambers care fixed in line with each 1
one of the said central tubos.
Fig. 3 reprosents a longitudinal section, and Fig. 4 a cross section of
a portion of an internal flue constructed in accordance with the second
part of my Invention. The said fluc is formed of rings d, d, welded
together at e, e. Each ring is formed from a plate of iron bent into a 1
cylindrical form and welded into a continuous ring; the two edges of
each ring are then flanched outwardly.
I prefer to form each flanched end to curve outwardly from the body
of the ring as indicated in section by Fig. 5, which is drawn about the
full size; but the outward bend may be made more acute and the 2
extent of projection of the flanch from the body of the ring be lessened
without departing from the nature and intent of my Invention.
When two rings are to be connected together, a flat ring, indicated
by f in Fig. 5, of a diameter suitable to the outer diameter of the
flanched ends of the rings is interposed between a flanch on one ring 2
and a flanch on the other ring, and the parts to be connected are then
sufficiently heated and are welded together. It may be convenient to
heat only a portion of the circumference of the joint preparatory to each
welding operation, as will be well understood.
In the example a cylindrical flue is represented, but the said flue may 3
be of the form represented by Figs. 1 and 2, or of an oval form, or of
any other cross sectional form employed in the construction of such
flues and " Galloway tubes," "water pockets," or any other required
additions may be made to the flues or to the rings which are to be
welded together to form the said flues.
31

page_text: Having now fully described and indicated the nature of my said In-
vention, and the manner in which I carry the same into practical effect,
I would in conclusion have it to be distinctly understood that I claim,―
First. The internal boiler flue formed and fitted with vertical water
tubes, substantially as and for the purpose indicated herein-before, and
by Figures 1 and 2 of the accompanying Drawings.
Secondly. Connecting together the rings of the internal flues of steam
generators by welding together the outwardly flanched ends of the said
rings, and an interposed flat ring, substantially as herein-before set
forth and indicated.
And, Lastly. The method of constructing the internal flues of steam
generators, substantially as set forth and indicated herein-before, and by
Figs. 3, 4, and 5 of the accompanying Drawings.
In witness whereof, I, the said George Plant, have hereunto set
hand and seal, this Twenty-sixth day of October, in the year
of our Lord One thousand eight hundred and seventy-five.
my
Signed and sealed by the
said George Plant in
the presence of
EDWARD K. DUTTON,
Agent to the Patentee.
3, Princess Street,
Manchester.
GEORGE PLANT. (L.S.)