In- PROVEMENTS IN BOILERS OR STEAM GENERATORS OF STEAM GENERATORS
Year: 1872

page_text: LETTERS PATENT to James Edge, of Bolton-le-Moors, in the County
of Lancaster, Mechanical Draughtsman, for the Invention of "In-
PROVEMENTS IN BOILERS OR STEAM GENERATORS.”
Sealed the 17th October 1872, and dated the 19th April 1872.
PROVISIONAL SPECIFICATION left by the said James Edge at the
Office of the Commissioners of Patents, with his Petition, on the
19th April 1872.
I, JAMES EDGE, of Bolton-le-Moors, in the County of Lancaster,
Mechanical Draughtsman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN BOILERS OF STEAM GENERATORS," to be as
follows:-
:-
My Invention has for its principal object to further improve or add to
the efficiency of the boiler or steam generator for which Her Majesty's
Royal Letters. Patent bearing date the Twenty-ninth day of August in
the year One thousand eight hundred and seventy-one, have been
granted to me, but my said Invention is also applicable to ordinary
"Cornish " and double-flued or internal-flued boilers.

page_text: In order to increase the efficiency of the said boiler or steam generator
or of an ordinary internal-flued boiler, I fix water tubes within the back
internal flue, or within each back internal flue, or within ordinary
internal flues, each tube extending across the upper part of the space for
the passage or flow of the heated gases through the said flue. Each
tube is formed with a flanch at each end, by means of which it is riveted
to the shell of the said flue, the said flanches being curved to suit the
curvature of the upper part of the internal surface of the said flue.
Each tube may be fixed in a horizontal position or may have an inclina-
tion from a horizontal line, or a part of the tubes in a flue may be
horizontal, the remainder being inclined. The said tubes being situated
in the hottest part of the flue add greatly to the efficiency of the boiler
or generator, and at the same time offer little obstruction to the cleansing
of the said flue. I am aware that water tubes have been fixed in internal
flues previously hereto, but such tubes have not been situated entirely
in the upper half of the flue as is the case in my present Invention.
The said tubes may also be applied to the internal fire-boxes of cylin-
drical upright-boilers. In such a case I apply the said tubes on each-
side of the vertical centre of the fire-box, or on both sides of ordinary
water tubes which cross the said vertical centre, as for example, I may
fix the said tubes in rows of three tubes, the tubes in one row being by
preference at right angles to the tubes in the row next immediately
above or below.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Edge in the Great Seal Patent Office on 2
the 18th October 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
EDGE, of Bolton-le-Moors, in the County of Lancaster, Mechanical
Draughtsman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 3
Letters Patent, bearing date the Nineteenth day of April, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said James Edge, Her special license that

page_text: I, the said James Edge, my executors, administrators, and assigns, or
such others as I, the said James Edge, 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
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS. IN BOILERS OR STEAM
GENERATORS," upon the condition, amongst others, that I, the said James
Edge, 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 James Edge, 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 and accompanying Drawings, that is to say :-.
My Invention has for its principal object to still further improve or
add to the efficiency of the boiler or steam generator for which Her
Majesty's Royal Letters Patent bearing date the Twenty-ninth day of
August, in the year One thousand eight hundred and seventy-one, have
been granted to me, but my said Invention is also applicable to ordinary
5 Cornish and double-flued or internal-flued boilers.
In order to increase the efficiency of the said boiler or steam generator
or of an ordinary internal-flued boiler, I fix water tubes within the back
internal flue, or within each back internal flue, each tube extending
across the upper part of the space for the passage or flow of the heated
gases through the said flue. Each tube is formed with a flanch at each
end, by means of which it is riveted to the shell of the said flue, the said
flanches being curved to suit the curvature of the upper part of the
'internal surface of the said flue. Each tube may be fixed in a hori-
zontal position, or may have an inclination from a horizontal line, or a
5 part of the tubes in a flue may be horizontal, the remainder being
inclined. The said tubes being situated in the hottest part of the flue
add greatly to the efficiency of the boiler or generator, and at the same
time offer little obstruction to the cleansing of the said flue.

page_text: The said tubes may also be applied to the internal fire-boxes of
cylindrical upright boilers. In such a case I apply the said tubes on
each side of the vertical centre line of the fire-box, or on both sides of
ordinary water tubes which cross the said vertical centre, as for example,
may fix the said tubes in rows of three tubes, the tubes in one row 5
being by preference at right angles to the tubes in the row next imme-
diately above or below. The said tubes may also be applied to the
I
internal fire-boxes of cylindrical upright boilers.
In order that my said Invention may be fully understood I will now
refer to the accompanying Sheet of Drawings illustrative of the manner 1
in which I carry the said Invention into effect, and marked with letters
of reference, corresponding letters indicating the same parts in the various
Figures.
Fig. 1 of the said Drawings represents a vertical longitudinal section,
and Fig. 2 a cross section of a boiler or steam generator of the description 1
for which Letters Patent have previously been granted to me as afore-
said, the said boiler being represented as fitted with the herein-before.
mentioned water tubes.
Each of the back internal flues a, a, is fitted with a number of the
water tubes b, b, each tube crossing the upper part of the flue, and being 2
connected internally with the water space of the boiler, as shewn in
Fig. 3, which represents a cross section of one of the said tubes, and of
the flue in which the said tube is fixed. Each tube is flanched as repre-
sented, and is riveted to the shell of the flue by means of rivets passing
through the said flanch, as will be well understood. The said tubes are 2
equally applicable in the case of ordinary Cornish or internal-flued
boilers.
Fig. 4 represents a cross section of an internal flue fitted with water
tubes inclined from the horizontal line, the effect being the same or
similar as when the tubes are fixed in a horizontal position. I am aware 3
that water tubes have been fixed in internal flues previously hereto, but
such tubes have not been situated entirely in the upper half of the flue,
as is the case in my said Invention.
Fig. 5 represents a horizontal cross section of a vertical cylindrical
boiler. In this example c, c, are cross tubes fixed in the ordinary a
positions in the upper part of the fire-box, and b, b, are additional tubes
formed similarly to the tubes b, b, in Figs. 1 and 2, and fixed on each

page_text: side of the tubes c, c. In some cases the tubes c, c, may be dispensed
with, the tubes b, b, being alone used. Only one horizontal row or more
than two rows of tubes may be fixed in a fire-box, as considered to be
most desirable in each case.
Having now fully described and illustrated the nature of my said
Invention, I would in conclusion have it to be understood that I claim
for the purposes herein-before set forth the employment of the water
tubes b, formed, fixed, and situated as herein-before described, set forth,.
and maicated.
In witness whereof, I, the said James Edge, have hereunto set
my hand and seal, this Seventeenth day of October, in the year
of our Lord One thousand eight hundred and seventy-two.
Signed and sealed by the said
James Edge, in the presence
of
EDWARD K. DUTTON,
.
Agent for the Patentee,
8, Smithy Door,
Manchester.
JAMES EDGE. (L.S.)