Year: 1888

page_text: Date of Application, 21st Jan., 1888
Complete Specification Left, 20th Oct., 1888
Complete Specification Accepted, 23rd Nov., 1888
We, CHARLES JOHN GALLOWAY and JOHN HENRY BECKWITH, both of Knott
Mill Iron Works, Manchester, in the County of Lancaster, Engineers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to that description of Galloway steam boiler in which the
internal flue has heretofore been made with flat or slightly curved top and bottom
surfaces and rounded or semicylindrical sides.
Our present improvements have for their object a construction of the flue whereby
this is made of greater internal area in transverse section than heretofore, thus
affording increased heating surface in the flue and also admitting of the introduction
of an additional number of Galloway tubes, so that the evaporative power of the
boiler is thereby increased.
For this purpose, instead of making the flue with semicylindrical or rounded sides,
we make the sides straight, and for the purpose of obtaining the necessary strength to
resist collapse we introduce vertical corrugations, such corrugations being by preference
so arranged that the distance between ridge and furrow is equal to the distance from
centre to centre of two consecutive rows of the Galloway tubes. The additional area
of top and bottom flue plates obtained by this means and the flat construction of the
sides of the flue enable a larger number of Galloway tubes to be introduced than in the
construction with rounded sides.*
n
11
31
1
T
1000
ABEL & IMRAY,
Agents for the Applicants.

page_text: We CHARLES JOHN GALLOWAY and JOHN HENRY BECKWITH both of Knott
Mill Iron Works Manchester in the County of Lancaster Engineers do hereby
declare the nature of this invention to be as follows:-
Our invention relates to that description of Galloway steam boiler in which the
internal flue has heretofore been made with flat or slightly curved top and bottom
surfaces and rounded or semi-cylindrical sides.
.
Our present improvements have for their object a construction of the flue whereby
this is made of greater internal area in transverse section than heretofore, thus affording
increased heating surface in the flue and also admitting of the introduction of an
additional number of Galloway tubes, so that the evaporative power of the boiler is
thereby increased.
For this purpose, instead of making the flue with semicylindrical or rounded sides,
we make the sides vertically straight or nearly so and for the purpose of obtaining
the necessary strength to resist collapse we introduce vertical corrugations, such corru-
gations being by preference so arranged that the distance between ridge and furrow
is equal to the distance from centre to centre of two consecutive rows of the Galloway
tubes.
The additional area of top and bottom flue plates obtained by this means and the
more flat construction of the sides of the fluc enable a larger number of Galloway
tubes to be introduced than in the construction with rounded sides.
The accompanying drawings represent a Galloway boiler with its tube flue
constructed according to our invention.
Fig. 1 is a longitudinal section and Fig. 2 a sectional plan taken above the flues.
Fig. 3 is a transverse section on Y Y and Fig. 4 a transverse section on Z Z. A is
the shell of the boiler and B the cylindrical fire flues of usual construction.
These flues open into the improved tube flue which has its upper and lower faces C
and D made as usual to concentric curvature, but has its two sides made with inward
and outward corrugations E and F, the spacing of these corrugations, corresponding
with that of the transverse rows of the Galloway tubes G. The tubes G are made
in the usual manner with their flanges fixed to the upper and lower faces of the
flue. Owing to the form adopted for the sides of the flue, which are straight instead
of being curved vertically, and owing also to the increased breadth given by the
outward corrugations F the flue can accommodate an increased number of the tubes G,

page_text: and this, in addition to the increase of surface furnished by the corrugations, adds
materially to power of a boiler of given dimensions whilst at the same time the
corrugations give increased strength to the flue.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In a Galloway boiler, a tube flue having its sides made with vertically straight or
nearly straight corrugations spaced in correspondence with the transverse rows of
Galloway tubes, substantially as and for the purposes herein set forth.
Dated this 20th day of October 1888.
ABEL & IMRAY,
Agents for the Applicants.