Improvements in Steam Boiler Furnaces and Flues.
Year: 1896

page_text: Date of Application, 13th Jan., 1896
Complete Specification Left, 21st Aug., 1896-Accepted, 26th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler Furnaces and Flues.
We JOHN BROWN AND COMPANY LIMITED of Atlas Works Sheffield in the
County of York and JOSEPH NODDER of the same place Iron Works Manager
do hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide boiler furnaces and flues which have
a high degree of resistance against collapse and an efficient elasticity of movement
when in work.
The plates are of unequal thickness the thicker portions being constituted by
corrugations or ribs arranged transversely to the axis of the furnace or flue
the concavity being on the fire side of the furnace or flue, and the convexity on the
water side the tops of the corrugations being thicker than the other portions of the
plate. Between the corrugations thus formed we make arched parts or portions
with a sweeping curve with the convexity on the water side and the concavity on
the fire side these curved parts preferably joining the corrugations aforesaid by
reversely curved portions.
Dated this 13th day of January 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
We, JOHN BROWN AND COMPANY, LIMITED, of Atlas Works, Sheffield, in
the County of York, and JOSEPH NODDER, of the same place, Iron Works
Manager, 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 :-
This invention has for its object to provide boiler furnaces and flues which have
a high degree of resistance against collapse, and an efficient elasticity of movement
when in work.
The plates of which the said boiler furnaces, or flues, are made are of unequal
thickness, the thicker portions being constituted by hollow ribs, arranged
transversely to the axis of the furnace, or flue; the concavity being on the fire
side of the furnace, or flue, and the convexity on the water side, the tops of the
said ribs being thicker than the other portions of the plate. Between the ribs thus
formed arched parts, or portions are made with a sweeping curve the convexity
thereof being on the water side and the concavity on the fire side; these curved
parts preferably joining the ribs aforesaid by reversely curved portions.
The accompanying drawing represents, in longitudinal section, a portion of a
boiler furnace, or flue, sufficient to illustrate this invention. A are the aforesaid
thickened hollow ribs, arranged transversely to the axis of the furnace, or flue.
These have a concavity on the fire side at a, the top, or convexity, a², being on the
water side of the furnace, or flue; B, are the arched parts, or portions, between the

page_text: ribs A; these said arched parts or portions, being made with a sweeping curve with
the concavity b, on the fire side, and the convexity 62, on the water side of the furnace,
or flue, the said parts B, joining the ribs A, by reversely curved portions as at c.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
A boiler furnace, or flue, having thickened hollow ribs, such as A, with arched
parts, or portions, such as B, with the concavities on the fire side, and the
convexities on the water side, of the furnace, or flue; as herein before described
and shewn in the accompanying drawing.
Dated this 21st day of August 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.