IMPROVEMENTS IX STEAM BOILERS AND THE METHOD OF CONGRATION Arn STEAM BOILERS and the Merwon CANENDATION OF " OF CONSTRUCTION OF THE
Year: 1867

page_text: LETTERS PATENT to Richard Pollit, of Bolton-le-Moors, in the County
of Lancaster, Boiler Maker, for the Invention of "IMPROVEMENTS IX
STEAM BOILERS AND THE METHOD OF CONGRATION Arn
STEAM BOILERS and the Merwon
CANENDATION OF
"
PROVISIONAL SPECIFICATION left by the said Richard Pollit at the
Office of the Commissioners of Patents, with his Petition, on the
29th May 1867.
I, RICHARD POLLIT, of Bolton-le-Moors, in the County of Lancaster, Boiler
Maker, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN STEAM BOILERS AND THE METHOD OF CONSTRUCTION OF THE SAME," to be as
follows:-
My Invention relates principally to an improvement in the form of boiler
for which Letters Patent were granted to me, bearing date the Ninth day of
July, in the year of our Lord One thousand eight hundred and sixty, and
consists in the application or addition of "water tubes" to the back internal
"elbow" flue for the purpose of obtaining a greater amount of heating
surface; these tubes I make of any suitable section, as circular or oval, and
fix them in the said flue or flues in a vertical, diagonal, or suitable angular
position, the ends of the tubes being open to the water space, and the body of
the tubes being exposed to the products of combustion passing through the
flue.

page_text: My method of construction of the said "elbow" flue as adapted to the
application and attachment of the "water tubes" is also applicable to other
forms of boiler than the one herein above referred to, and is as follows,
namely, from about the centre of the plate which is to form one "ring" of
the flue a piece is cut out of a size and form suitable to the cross section of
the water tube, and. from each end of the plate a piece is cut of a form and
size suitable to form a corresponding opening to the one in the centre of the
plate, when the plate is bent into a ring or cylinder and the edges or ends of
the plate on each side of the opening are welded together suitable rivet holes
are formed around the openings for the attachment of the water tube in
position, and a template is temporarily fixed by means of the rivet holes near
the joint for the purpose of maintaining the form of the "ring" and the
relative positions of the ends during the operation of welding. This method
of construction. enables me to obtain a sound "weld," owing to the portion to
be welded at each operation being comparatively short.
SPECIFICATION filed in pursuance of the conditions of the Letters Patent,
and of an Order of the Lord Chancellor, by the said Richard Pollit in
the Great Seal Patent Office on the 7th December 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME I, RICHARD
POLLIT, of Bolton-le-Moors, in the County of Lancaster, Boiler Maker, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of May, in the year of our Lord One
thousand eight hundred and sixty-seven, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Richard Pollit, Her special license that I, the said Richard Pollit, my
executors, administrators, and assigns, or such others as I; the said Richard
Pollit, 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 STEAM BOILERS AND THE
METHOD OF CONSTRUCTION OF THE SAME," upon the condition (amongst others)
that I, the said Richard Pollit, by an instrument in writing under my
band and scal, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and cause

page_text: 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 Richard Pollit, do hereby declare the
nature of my said Invention, and in what manner the same
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 principally to an improvement in the form of boiler
for which Letters Patent were granted to me, bearing date the Ninth day of
July, in the year of our Lord One thousand eight hundred and sixty, and
consists in the application or addition of "water tubes" to the back internal
"elbow flue" of the said boiler for the purpose of obtaining a greater amount
of heating surface. These tubes I make of any suitable section, as circular or
oval, and fix them in the said flue or flues in a vertical, diagonal, or suitable
angular position, the ends of the tubes being open to the water space, and the
body of the tubes being exposed to the products of combustion passing through
the flue.
My method of construction of the said "elbow" flue as adapted to the
application and attachment of the "water tubes "is also applicable to other
forms of boiler than the one herein above referred to, and is as follows,
namely, from about the centre of the plate which is to form one "ring" of the
flue a piece is cut out of a size and form suitable to the cross section of the
water tube, and from each end of the plate a piece is cut out of a form and
size suitable to form a corresponding opening to the one in the centre of the
plate when the plate is bent into a ring or cylinder, and the edges or ends of
the plate on each side of the opening are welded together. Suitable rivet
holes are formed around the openings for the attachment of the water tube in
position, and a template is temporarily fixed by means of the rivet holes near
the joint for the purpose of maintaining the form of the "ring" and the
relative positions of the ends during the operation of welding. This method
of construction enables me to obtain a sound "weld" owing to the portion to
be welded at each operation being comparatively short.
In order that my said Invention may be fully understood I have annexed to
this Specification a Sheet of Drawings with letters of reference marked.
thereupon, the same letters indicating corresponding parts in the various.
Figures.
Referring now to the said Drawings, Fig. 1 is a longitudinal elevation,
partly in section, of a boiler of the description berein-above referred to, and.
known as Pollit's Patent boiler, my present improvements being shewn added.
thereunto, and Fig. 2 is a cross section on the line A, B, in Fig. 1, both Figures.

page_text: being drawn to a scale of about one-half inch to a foot; Fig. 3 is a plan of one
of the plates prepared to be bent into a cylinder to form one of the " rings"
of the back internal flue of the boiler, and Fig. 4 is a plan of the same when
bent into a ring and prepared for the welding operation, Figs. 3 and 4 being
drawn to a scale of about two inches to a foot.
In Figs. 1 and 2, a, a, are the water tubes, which are inserted in the back
internal flue or flues b, b, the said tubes being of any ordinary or suitable form
and section, the rings composing the flue or flues b, b, being formed, con-
structed, or put together in the usual manner, or in the manner next to be
described.
Fig. 3 shews a plate of metal with the portions in the centre, and at the
two ends cut out to form the connections with the interior of the water tube
for the passage of water. In the Drawing the rivet holes for connecting
together the separate rings of the flue are shewn as being punched or drilled
previously to the plate being bent into a ring, but they may be punched or
drilled after the said plate is bent if preferred.
Fig. 4 shews the plate as when bent into a ring or cylinder, the ends of the
plate coming together and overlapping, an orifice or opening being formed by
the junction of the two ends of the plate corresponding to the opening formed
in the centre of the said plate, as will be readily understood from an inspection
of the Drawings, A template c with bolt holes corresponding to a portion of
those in the flanch of the water tube is fixed across the opening to keep the
ends in position, and the overlapping ends of the plate d, d, situated on each
side of the opening are firmly welded together; the water tube is then inserted
in the ring and rivetted in its place, the separate rings thus formed being
connected together by any of the usual methods, or in the manner shewn in
Fig. 1, in which the said rings are shewn connected together by means of
T-iron rings e, e. If it be desirable to fix more than one water tube in each
ring the additional tube or tubes may be fitted and affixed to openings cut
in the plate in the usual manner, or in the manner herein described,
Having now described the nature of my Invention, and the method
of carrying the same into effect, I wish it to be understood that I claim as
novel,
First, the application of tubes of any suitable form to the back internal flue
of the boiler known as Pollit's Patent boiler.
And, secondly, the manner in which the plate which is to form a ring of the
said back internal flue, or of the internal flue of a boiler other than Pollit's
Patent boiler, is cut out and prepared for the reception and attachment
of a water tube or of water tubes of any suitable forn, and for the

page_text: welding of the longitudinal seams of the said ring, substantially as herein-
above described and illustrated in the Drawings attached.
In witness whereof, I, the said Richard Pollit, have hereunto set my
hand and seal, this Twenty-sixth day of November, in the year of our
Lord One thousand eight hundred and sixty-seven.
Signed and sealed by the
said Richard Pollit, in the
presence of
EDWARD K. DUTTON,
Patent Agent,
RICHARD POLLIT. (L.S.)
Manchester.