AN IMPROVED HORIZONTAL TUBULAR BOILER
Year: 1872

page_text: LETTERS PATENT to William Edward Gedge, of No. 11, Wellington
Street, Strand, in the County of Middlesex, Patent Agent, for the
Invention of "AN IMPROVED HORIZONTAL TUBULAR BOILER."- A com-
munication from abroad by Emile Welter, of No. 64, Faubourg
St. Martin, Paris, France.
Sealed the 6th August 1872, and dated the 10th February 1872.
PROVISIONAL SPECIFICATION left by the said William Edward Gedge
at the Office of the Commissioners of Patents, with his Petition, on
the 10th February 1872.
I, WILLIAM EDWARD GEDGE, of No. 11, Wellington Street, Strand,
in the County of Middlesex, Patent Agent, do hereby declare the
nature of the said Invention for "AN IMPROVED HORIZONTAL TUBULAR
BOILER," a communication to me from abroad by Emile Welter, of
No. 64, Faubourg St. Martin, Paris, France, to be as follows:-
The object of the horizontal tubular boiler of this Invention is to
largely increase the direct heating surface, the result being a great pro-

page_text: This boiler differs
from ordinary boilers mainly in the arrangement and destination of the
tubes, which from smoke tubes become boiling tubes, and which are
This fire and smoke
enclosed in a casing forming fire and smoke box.
box is placed within the boiler and concentrically in every way to its
sides; the water and the steam communicate front and back with the
boiling tubes.
duction of steam and consequent economy of fuel.
One of the advantages of this boiler is the possibility of replacing
burnt or defective tubes, and removing tartar or calcareous incrustations
without stopping the machine by means of conical or other digester
stoppers or hollow cross pieces placed on the front and back faces
opposite each tube. This improved boiler is divided by means of two
fire-brick partitions so as to compel the flame to hug the tubes; the
draught of the chimney can no longer lay the flame in a single part of
the boiler.
The boiling tubes of this Invention are applicable to the boilers of
fixed, locomotive, marine, and other engines.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Edward Gedge in the Great Seal Patent
Office on the 8th August 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
EDWARD GEDGE, of No. 11, Wellington Street, Strand, in the County of
Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of February, 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 William Edward Gedge, Her special
licence that I, the said William Edward Gedge, my executors,
administrators, and assigns, or such others as I, the said William
Edward Gedge, 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

page_text: Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "AN IMPROVED HORIZONTAL TUBULAR BOILER," a communica-
tion to me from abroad by Emile Welter, of No. 64, Faubourg St. Martin,
Paris, France, upon the condition (amongst others) that I, the said
William Edward Gedge, my executors or administrators, by an instru-
ment in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said In-
vention, 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 William Edward Gedge, 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 :—
The object of the horizontal and tubular boiler the subject of this
Invention is to very considerably increase the direct heating surface, the
result being a large production of steam and a saving of fuel. It differs
principally from those hitherto made by the arrangement of the tubes,
which from smoke tubes become boiling tubes, enclosed in a cylindrical
casing forming fire and smoke box, having in front the chimney and the
ash pan of the fire flakes or sparks, which replaces the smoke box of
ordinary tubular boilers, and at the back a rectangular fire-box which
contains the grate or fire-bars. This casing is concentric on all sides in
relation to the boiler holding the water, and the steam communicating
front and back with the boiling tubes.
The replacing of burnt or defective tubes, as well as the removal of
the tartar arising from the deposits of calcareous water in the tubes are
effected by means of conical self-closing or "autoclave" stoppers or
hollow cross pieces placed upon the face, front, and back opposite each
tube, or any other mechanical means by which the same result may be
obtained.
The fire flakes or sparks which fall to the bottom of the casing of the
tubes are pushed into the front ash pan by access through the door of the
fire-place.
The removal of the soot which adheres to the tubes is effected from
time to time by throwing down the fire-bars and by the inspection opening

page_text: in the back face placed above the tubes in such wise that what is passing
within the casing of the tubes may always be seen even during the
working.
At the two points indicated by A and A¹ on the accompanying Sheet
of Drawing are placed intercepting barriers or partitions preferably of
fire-brick, as sheet iron exposed to the direct action of the flame is easily
burnt; these two barriers will serve, firstly, to prevent any shaking of
the tubes thus twice supported in their length, further to compel the
direct heat to pass irregularly ("en chicane") through the tubes, the
draught of the chimney no longer laying the flame in the fire-place in
the direction of the boiler.
The boiling tubes shown horizontally on the Drawing are preferably
inclined to accelerate the circulation of the water and to preserve them
from fire strokes. At the back of the boiler is an inspection opening B,
only one is shown, but they may be multiplied; there is advantage in
placing two more at C and D, simple doors with fastenings are sufficient,
and by this means what is taking place within the boiler and at the
boiling tubes may always be ascertained; E is a hole by which the
boiler is cleaned.
The Drawing shows seven different kinds of self-closing and other
stoppers for closing the holes placed at the two ends in front of the
tubes, and serving for the cleaning of these latter.
The self-closing Nos. 1, 2, and 7 are combined with stoppers with and
without screw and gland so as to plug the tubes and intercept the
circulation of the water, and in this manner it is possible during the
working, without removing fire pressure or water, to avoid any stoppage
until circumstances are favorable for the replacing of the injured tube.
This same system is applicable to every kind of generators, particularly
to marine boilers, and generally to all kinds of generators and apparatuses
which are not likely to be set in brickwork or masonry, and where there
is advantage in a great heating surface all direct, and consequently a
great and rapid production of steam.
The advantages of this Invention may be summed up as-
1°. Increase of heating surface.

page_text: ion communicated to me as aforesaid, I desire it to be understood that
I claim the use of the arrangement and application of boiling tubes in a
ylindrical casing in the boilers of locomotive road engines, fire engines,
nd marine and other engines, substantially as and for the purposes
erein-before set forth.
In witness whereof, I, the said William Edward Gedge, have
hereunto set my hand and seal, this Eighth day of August,
in the year of our Lord One thousand eight hundred and
seventy-two.