IMPROVEMENTS IN FURNACE OR FLUE SEAMS AS APPLIED TO ALL KINDS OF STEAM BOILERS
Year: 1884

page_text: I SAMUEL BOSWELL residing at 6 Cass street Salford in the county of Lancashire
Boiler Inspector do hereby declare the nature of my invention for IMPROVEMENTS
IN FURNACE OR FLUE SEAMS AS APPLIED TO ALL KINDS OF STEAM BOILERS to be
as follows:-
A flanged seam flanged as shown in the accompanying drawings so as to form a
rigid joint to resist collapse and still allow for expansion & contraction in a
longitudinal direction, for which I claim an anti-collapsing seam allowing free
expansion.
More effective heating surface in the gasses being repeatedly expanded in passing
from small diameter portion of furnace or flue to larger diameter portion of furnace
or flue, the heated gasses being in closer contact with the plates owing to their
contracted diameters. More effectual water circulation, owing to the peculiar form
of water spaces which allow a downward current of water to replace water
displaced by upward circulation.
The Seam is easily constructed, & very easily repaired, being quite accessible on
both sides for either cleaning, examining, or repairing, the Plates can all be
ordered one size & made from one template, & any number of plates can be used
to make one furnace or flue, a soft iron liner can be used between the flanges for
caulking or other purposes when required so as not to caulk edges of Plate, but the
liner need not be applied when edges of Plates are to be caulked, which can be done
both inside & outside. My improved flanged furnace or flue, (or any portion of it)
can be cut loose & withdrawn from boiler at any time, for repairs to, or for thorough
cleaning of, boiler shell, without in anyway interfering with front end plate, or
any other part of Boiler, boiler setting or fittings, which cannot be done by any
other make of boiler flue, my improved seam can be applied to steam Boilers &
Marine" &
vessels of all kinds, including "vertical," "Cornish," "Lancashire"
other types of boilers, & can be made corrigated, or with water-pipes or pockets,
& I also claim the furnace or flue with my improved seam to be more durable than
any other, the combined thickness of flanges being an equal thickness throughout, one
being flanged outwards & one being flanged inwards as shown in the drawings &
rivets accessible, & out of direct line of fire are protected against overheating. All the
1

page_text: above advantages I claim for my invention for the improvements of furnace or flue
seams as shown in accompanying drawings. In the drawings Fig 1 shows a sectional
view of a furnace or flue made up of three rings of plates, any number of plates may
be used, but plates in lengths of 2' 6" to 3' 0" will be found most suitable, Fig 2
shows an enlarged section of joint, riveted, it may however be bolted if exceptional
circumstances require it the caulking liner is not shown, but may be used where
necessary. The arrow denotes the direction of the draught, & drawings are made
roughly to scale as given on drawings.

page_text: COMPLETE
SPECIFICATION.
I SAMUEL BOSWELL residing at 6 Cass st Salford Lancashire Biler Inspector, do
hereby declare the nature of my invention for IMPROVED FURNACE & FLUE SEAMS
AS APPLIED TO ALL KINDS OF STEAM BOILERS and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement:—
A flanged seam, flanged as shown in accompanying drawings so as to be a
rigid joint to resist collapse & still allow for expansion & contraction in a longi-
tudinal & circumferential direction, for which I claim an auti collapsing scam
allowing free expansion more effective heating surface in the gases being repeatedly
expanded in passing from small diameter portion of furnace or flue, to larger
diameter portion of furnace or flue, the heated gases, being in closer contact with
the plates, owing to their contracted diameters, more effectual more effectual water
circulation owing to the peculiar form of water spaces, which allow downward
currents of water to replace water displaced by upward circulation, the seam is
easily constructed very easily repaired being quite accessible on both sides, either
for cleaning, examining or repairing, the plates can all be ordered one size, & made
from one template, & any number of plates can be used to make one furnace or
flue, a soft iron liner can be used between the flanges, for caulking or other
purposes, when required, so as not to caulk, edges of plates, but the liner need not
be applied when edges of plate are to be caulked, which can be done inside &
outside My improved flanged furnace or flue, or any portion of it can be cut
loose & withdrawn from boiler, at any time for repairs to, or for thorough cleaning
of boiler shell without in any way interfering with front end plate or any other
part of Boiler, or boiler setting or fittings, which cannot be done by any other make of
boiler furnace or flue, My Improved seam can be applied to steam boilera & vessels of
all kinds including vertical, Cornish, Lancashire, marine & all other types of Boiler,
& can be made corrigated or with water pipes or pockets, & I also claim my
improved flanged furnaces or flues to be more durable than any other, the combined
thickness of flanges being an equal thickness throughout, one being flanged
outwards & one being flanged inwards, & rivets accessible & out of direct line of
fire, are protected against overheating, I also claim for my invention, the
distinguishing feature of being able to withdraw the furnace from shell without
removing end plato, & I also claim the peculiar form of water space with its
advantages, All the above advantages I claim, for my invention for the improve-
ment of furnaces or flues as shown in accompanying drawings. In the drawings
fig 1 shows a sectional view of a furnace or flue made up by three rings of plates,
any number of plates may be used. Fig 2 shows an enlarged section of a joint
riveted with " rivets a closer pitch than usual, it may however be riveted with
/ rivets usual pitch, or it may be bolted if exceptional circumstances require it.
The caulking liner is not shown but may be applied where necessary. The arrow
in fig 1 denotes the direction of the draught, I do not limit myself to any parti-
cular mode of connecting furnaces to end plate as they can be attached to end

page_text: plate as shown in figs 1. 3. & 4, or in other ways. A representing the end plate,
& B representing the furnace plate. Neither do I limit myself to any particular
amount of taper in plate or any particular angle of flange.
I claim as my invention the furnace or flue with scams & water spaces, &
facilities for withdrawing out of boiler without removing front end plate & of a
conical form as described above & on drawing.