Year: 1887

page_text: Date of Application, 8th Aug., 1887
-Complete-Left; 28th Apr., 1888
Complete Accepted, 1st June, 1888
I, CHARLES JOHN GALLOWAY of Knott Mill Iron Works, Manchester, in the
County of Lancashire, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to internal fluid steam boilers of the "Galloway" type in
which the top and bottom portions of internal flues are of a somewhat flattened form,
such as a convex bottom plate connected to a concave upper plate by side plates of
semicircular or other curvature.
My improvements have for their object to impart increased strength to such flues
to withstand the steam pressure.
For this purpose, I form the said curved sides of the flue with corrugations which are
by preference made to die away towards the upper and lower ends, these being left
flat so as to be rivetted to the flat surfaces of the concave and convex or other shaped
top and bottom plates.
Furthermore, I bulge or dish the top and bottom plates at the spaces between the
openings to which the "Galloway" tubes are attached, so as to strengthen such parts
against the internal pressure tending to bulge them inwards.
ABEL & IMRAY,
Agents for the Applicant.

page_text: I CHARLES JOHN GALLOWAY of Knott Mill Iron Works Manchester in the
County of Lancashire Engineer do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
My invention relates to internal flued steam boilers of the "Galloway" type in
which the top and bottom portions of internal flues are of a somewhat flattened form,
such as a convex bottom plate connected to a concave upper plate by side plates of
semicircular or other curvature.
My improvements have for their object to impart increased strength to such flues to
withstand the steam pressure. For this purpose 1 form the said curved sides of the
flue with corrugations which are by preference made to die away towards the upper
and lower ends, these being left flat so as to be rivetted to the flat surfaces of the concave
and convex or other shaped top and bottom plates.
Furthermore I bulge or dish the top and bottom plates at the spaces between the
openings to which the "Galloway" tubes are attached, so as to strengthen such parts
against the internal pressure tending to bulge them inwards.
Fig. 1 of the accompanying drawing shews a cross section and Fig. 2 a sectional
plan of a steam boiler with my above described improvements applied thereto.
The curved sides A A of the internal flue are formed with corrugations as shewn,
such corrugations being made to die away at top and bottom so as to present flat edges
which are rivetted to the flat edges of the top and bottom plates B and C. These
latter are formed with bulged parts D D between the tubes E so as to strengthen them
against the inward pressure.
The said corrugations and bulges may be made smaller or larger than those shown
in proportion to the size of the boiler, according as circumstances may require.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what
I claim is
1. In internal flued steam boilers of the kind herein referred to, constructing the
rounded sides of the internal flue with corrugations substantially as herein described.
2. In internal fluid steam boilers of the kind herein referred to, constructing the
top and bottom plates of the internal flue with bulges or dished portions in the parts
between the tubes substantially as herein described.