A NEW OR IMPROVED CONSTRUCTION AND MANUFACTURE OF BOILER-FLUES AND BOILER-SHELLS AND EXPANSION JOINTS FOR THE SAME DADT הח TILE מז.. INVENTION DUING ADDITCH DEE O DOLL Eng BEING APPBLE TO
Year: 1882

page_text: LETTERS PATENT to George Walter Dyson of Bolton in the County of
Lancashire, for an Invention of "A NEW OR IMPROVED CONSTRUCTION AND
MANUFACTURE OF BOILER-FLUES AND BOILER-SHELLS AND EXPANSION JOINTS
FOR THE SAME DADT
הח
TILE
מז..
INVENTION DUING
ADDITCH DEE
O DOLL Eng
PROVISIONAL SPECIFICATION left by the said George Walter Dyson at
the Office of the Commissioners of Patents on the 22nd November 1882.
GEORGE WALTER DYSON of Bolton in the County of Lancashire A NEW OR
IMPROVED CONSTRUCTION AND MANUFACTURE OF BOILER-FLUES AND BOILER-SHELLS
AND EXPANSION JOINTS FOR THE SAME, PART OF THE -SAID INVENTION BEING
APPLICABLE TO BOILERS OF ORDINARY CONSTRUCTION
This invention relates to a new or improved construction and manufacture of
boiler-flues and boiler-shells and expansion joints for the same, part of the said
invention being applicable to boilers of ordinary construction
This invention consists firstly of a boiler-flue or boiler-shell constructed of a
spiral or helical coil of plain plate or bar iron or steel (etcetera) united by a corre-
sponding spiral or helical expansion joint plate, the said joint plate having an
external curved projection or an internal curved projection or both an external and
an internal curved projection, or united by a joint plate of similar or equivalent
construction
This invention consists secondly of a modification of the above firstly described
improvement in which the spiral or helical coil of plate or bar iron steel (etcetera)
is corrugated-for the purpose of expansion and contraction-the said coil being
joined by an ordinary "butt-joint" or a "lap-joint" or by an expansion joint as
firstly described
This invention consists thirdly of a modification in which the spiral or helical
coil is so rolled or formed with recesses or channels as that (when coiled) the edges

page_text: will overlap to form a "lap-joint" the flue or boiler-shell being practically of
uniform diameter
This invention consists fourthy of a construction of boiler-flue or boiler-shell
made in sections as above firstly, secondly and thirdly described the said sections
being joined by a weldless expansion ring with double corrugations that is with an
external and an internal bend this expansion ring (duplex expansion ring) being
applicable to the joining of flue rings of boilers of ordinary construction-
This invention consists fifthily of the construction of a-boiler as above firstly,
secondly thirdly and fourthly described the-end plates of which are parallel to or
at the same angle as the pitch-lines of the spiral or helical coil, and set obliquely
to the longitudinal-centre line of the boiler or flue
Boiler-flues and boiler-shells constructed as above specified can be drilled or
punched and rivetted-up after the plates or bars are coiled and fitted together or
the straight plates and bars can be drilled or punched before being coiled, and be
afterwards rivetted up to form a complete boiler-flue or boiler-shell
The coils for the flues and shells as above specified are made by coiling the bars
or plates on a spindle or barrel of the diameter that the flue or shell is required to
be the said coiled bars or plates and the expansion joint coils being rivetted
together in the ordinary manner

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Walter Dyson in the Great Seal Patent Office on the
22nd May 1883.
GEORGE WALTER DYSON of Bolton in the County of Lancashire "A NEW OR
IMPROVED CONSTRUCTION AND MANUFACTURE OF BOILER-FLUES AND BOILER SHELLS,
AND EXPANSION JOINTS FOR THE SAME, PART OF THE SAID INVENTION BEING
APPLICABLE TO BOILERS OF ORDINARY CONSTRUCTION
This Invention relates to a new or improved construction and manufacture of
boiler-flues and hailer-shells and expansion joints for the same, part of the said
Invention being applicable to boilers of ordinary construction.
This Invention consists firstly of a boiler flue or boiler shell constructed of a
spiral or helical coil of plain plate or bar iron or steel (etcetera) united by a corre-
sponding spiral or helical expansion joint plate the said joint plate having an
external curved projection or an internal curved projection or both an external and
an internal curved projection or united by a joint plate of similar or equivalent
construction.
This Invention consists secondly of a modification of the above firstly described
improvement in which the spiral or helical coil of plate or bar of iron steel
etcetera is corrugated-for the purpose of expansion and contraction-the said
coil being joined by an ordinary butt joint" or a "lap joiut" or by an expansion
joint as firstly described,
This Invention consists thirdly of a modification in which the spiral or helical
coil is so rolled or formned with recesses or channels as that (when coiled) the edges
will overlap to form a "lap joint" the flue or boiler shell being practically of
uniform diameter.
This Invention consists fourthly of a construction of boiler flue or boiler shell
made in sections as above firstly, secondly or thirdly described the said sections
being joined by a weldless expansion ring with a double corrugation that is with
an external and an internal bend this expansion ring (duplex expansion ring) being
applicable to the joining of flue rings of boilers of ordinary construction.
This Invention consists fifthly-of the construction of a boiler as above firstly
secondly thirdly and fourthly described the end plates of which are parrallel to or
at the same angle as the pitch lines of the spiral or helical coil and set obliquely to
the longitudinal centre line of the boiler or flue.
Boiler flues and boiler shells constructed as above specified can be drilled or
punched and rivetted up after the plates or bars are coiled and fitted together or
the straight plates and bars can be drilled or punched before being coiled and be
afterwards rivetted up to form a complete boiler flue or boiler shell.
The coils for the flues and shells as above specified are made by coiling the bars
or plates on a spindle or barrel of the diameter that the flue or shell is required to
be, the said coiled bars or plates and the expansion joint coils being rivetted
together in the ordinary manner,
The accompanying drawings illustrate my invention. Figure 1 is a side view in
elevation of part of a boiler flue constructed with a flanged helical coil of bar or
plate iron or steel for a boiler with perpendicular ends that is to say with the
boiler ends at right angles to the longitudinal centre line of the boiler. Figure 2
is a similar view of the same construction of flue for a boiler in which the ends are
set obliquely, or at an angle to, the longitudinal centre line of the boiler; the bar
or plate is rolled or formed to the flanged or trough section, and coiled so as to
bring the flanges together, when they are rivetted to make a steam tight joint,