IMPROVEMENTS IN THE CONSTRUCTION OF STEAM-BOILERS
Year: 1881

page_text: LETTERS PATENT to Samson Fox, of the Leeds Forge, New Wortley, Leeds,
in the County of York, Engineer, for an Invention of "IMPROVEMENTS IN
THE CONSTRUCTION OF STEAM-BOILERS."
PROVISIONAL SPECIFICATION left by the said Samson Fox at the Office
of the Commissioners of Patents on the 19th October 1881.
SAMSON Fox, of the Leeds Forge, New Wortley, Leeds, in the County of York,
Engineer. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
My improvements have reference to steam generators of the "Galloway" type.
A steam boiler according to my Invention is constructed with two circular corru-
gated fire boxes connected to a single internal flue of an elliptical or elongated
sectional form containing cross-water tubes, and formed of plates with corrugations
as follows (that is to say):-The flat or curved top and bottom of the said flue
may be either plain, or embossed, or corrugated at the parts between the cross
tubes, the edges of the plates are made plain for rivetting or welding to the sides,
which are formed with corrugations in the direction of the circumference of the
flue, or at right angles to the longitudinal axis of the boiler, such corrugations may
be produced either by stamping or swaging. The edges of the corrugated side
plates are made plain to enable them to be rivetted or welded to the top and
bottom plates.
By the above construction the flue acquires additional strength to resist a
collapsing strain, and at the saine time presents an undulating and superior surface
for the action of the products of combustion which are caused to take a winding or
zig zag path, both by the corrugations and the interposition of cross tubes. The top
and bottom parts of the flue are stayed by the tubes, which may be either conical
or parallel, or may be of the plain "Galloway" type, but I prefer to use tubes
having corrugations running lengthwise thereof, as described in the Specification
of Letters Patent granted to me the 29th December 1877, No. 4935.
These cross tubes I place vertically or thereabout and in a quincunx position
along the flue, so that the flatne may act more effectually upon them and the
corrugated sides of the flue in passing, and thereby increase the generative power
of the boiler.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Samson Fox in the Great Seal Patent Office on the 14th April
1882.
SAMSON Fox, of the Leeds Forge, New Wortley, Leeds, in the County of York,
Engineer. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
My improvements have reference to steam generators of the “ Galloway type."
A steam boiler according to my Invention is constructed with two circular corra-
gated fire boxes connected to a single internal flue of an elliptical or elongated
cross-sectional form containing cross water tubes, and formed of plates with
corrugations as follows (that is to say):-The flat or curved top and bottom of the
said flue may be either plain, or embossed, or corrugated at the parts between the
cross-water tubes, the edges of the plates forming the top and bottom of the single
flue being made plain for rivetting or welding to the sides, which are formed with
corrugations in the direction of the circumference of the flue, or at right angles to
the longitudinal axis of the boiler, such corrugations may be produced either by
stamping or swaging. The edges of the corrugated side plates are made plain to
enable them to be rivetted or welded to the top and bottom plates.
By the above construction the flue acquires additional strength to resist a
collapsing strain, and at the same time presents an undulating and superior surface
for the action of the products of combustion which are caused to take a winding or
zigzag path, both by the corrugations of the sides and the top and bottom, and the
interposition of cross tubes, especially when those tubes are corrugated. The top
and bottom parts of the flue are stayed by the tubes, which may be either conical
or parallel, or may be of the plain "Galloway type," but I prefer to use tubes
having corrugations running length wise thereof, as described in the Specification of
Letters Patent granted to me the 29th December 1877, No. 4935.
These cross
tubes I place vertically or thereabout and in a quincunx position along the flue, so
that the flame may act more effectually upon them and the corrugated sides (and
on the top and bottom when corrugated or embossed) of the flue in passing, and
thereby increase the generative power of the boiler.
In the accompanying Sheet of Drawings, Fig. 1 is an end view of a boiler
according to my Invention; Fig. 2 is a plan with the shell in section on the
line a, b, of Fig. 1, and one side of the elongated flue broken away to shew its
longitudinal section on the line c, d; Fig. 3 is a cross section on the line e, f, of
Figs. 2 and 4, shewing two of the corrugated cross water tubes in vertical section, and
also the corrugations of the side plates and the embossing of the top and bottom
plates of the elongated flue; Fig. 4 is a longitudinal vertical section of the shell on
the line g, h, Fig. 3, and of one of the corrugated fire boxes and the elongated flue
on the line i, j, Figs. 1 and 3; k is the shell of the boiler; 1, 1, are the two circular
corrugated fire boxes; m, n, are respectively the top and bottom plates of the
elongated flue; these have embossings or corrugations at the parts o between the
cross water tubes; p and q are the segmental corrugated side plates of said flue,
shewn rivetted to the top and bottom plates at 7 and 8, and welded to the said
top and bottom plates at t and u; v are the longitudinally corrugated cross water
tubes. The usual longitudinal stay bolts and gussets forming no part of this
Invention are not shewn in the Drawings.
Having described the nature of the said Invention and the manner of carrying
the same into practical effect, I would have it understood that what I consider to
be novel and original and therefore claim under the Letters Patent herein before
first in part recited is,-
Constructing boilers of the "Galloway type" with corrugated plates and tubes

page_text: arranged to afford increased or more efficient heating surface, substantially as
hereinbefore described and illustrated.
In witness whereof, I, the said Samson Fox, have hereunto set my hand
and seal, this Eighth day of April, in the year of our Lord One thousand
eight hundred and eighty two.
Witness to the signature of
the said Samson Fox,
THO³. E. CRAVEN, C.E.,
Patent Agent,
24, Victoria Chambers,
South Parade,
Leeds.
SAMSON FOX. (L.S.)