Improvements in Boiler Furnaces and Flues.
Year: 1896

page_text: Date of Application, 25th Apr., 1896
Complete Specification Left, 20th Jan., 1897-Accepted, 27th Mar., 1897
Improvements in Boiler Furnaces and Flues.
We JOHN BROWN AND COMPANY LIMITED of Atlas Works, Sheffield, in
the County of York, and JOSEPH NODDER, of the samo place, Iron Works
Manager, do hereby declare the nature of this invention to be as follows:-
In boiler furnaces and flues as hitherto arranged, or constructed, unequal
expansion and contraction takes place, owing to the upper part being subjected
to the direct action of the fire and hot gases, whilst the lower part is not so
acted upon; and this unequal expansion and contraction sets up strains which
are very injurious, and. it is the object of this invention to provide furnaces, and
Bucs, in which this objection is overcome by so making the furnace, or flue, that
it is not subject to the unequal expansion and contraction, and consequent strains,
hitherto existing, this being effected as follows:-The furnace, or flue, is provided
with ribs projecting at suitable intervals around its main body, and in the upper
part of the furuace, or flue, that is in the part above the fire-bars, the portions
between the said ribs are outwardly curved, or arched, but in the lower part of
the furnace, or flue, that is in the part beneath the fire-bars, the portions between
the said ribs are flat, or parallel, with the axis of the furnace or flue. The
curved, or arched, parts aforesaid preferably extend down to, or a little below,
the level of the fire-bars. The aforesaid construction gives elasticity to the
furnace, or flue, exactly where required, and obviates injurious strains due to
unequal heating and cooling.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in 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 and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
In boiler furnaces and flues as hitherto arranged, or constructed, unequal
expansion and contraction takes place, owing to the upper part being subjected to
the direct action of the fire and hot gases, whilst the lower part is not so acted
upon; and this unequal expansion and contraction sets up strains which are very
injurious, and it is the object of this invention to provide furnaces, and flues, in
which this objection is overcome by so making the furnace, or flue, that it is not
subject to the unequal expansion and contraction, and consequent strains, hitherto

page_text: existing, this being effected as is hereinafter described with reference to the
accompanying drawings:-
Figures 1 and 2 shewing respectively in longitudinal and transverse sections a
furnace or flue formed in accordance with this invention.
The furnace, or flue, is provided with ribs A projecting at suitable intervals
around its main body, and in the upper part of the furnace, or flue, that is in the
part above the fire-bars, the portions between the said ribs A are outwardly
curved, or arched, as shewn at a, but in the lower part of the furnace, or flue, that
is in the part beneath the fire-bars, the portions between the said ribs are flat, or
parallel, with the axis of the furnace, or flue, as shewn at b. The ribs A may be
of the same thickness as the other portions of the furnace or flue or of different
thickness, the said ribs preferably being thicker as shown.
The curved or arched parts a preferably extend down to, or a little below, the
level of the fire-bars. The aforesaid construction gives elasticity to the furnace,
or flue, exactly where required, and obviates injurious strains due to unequal
heating and cooling.
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 :-
A boiler furnace or Blue having ribs projecting around its main body, the parts
between these ribs being, in the portion of the furnace or flue above the fire-bars,
outwardly curved or arched and the parts between these ribs, in the portion
beneath the fire-bars, boing flat or parallel with the axis of the furnace or flue.
Dated this 20th day of January 1897.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.