draught and Curing of Smoky Chimneys.
Year: 1885

page_text: draught and Curing of Smoky Chimneys.
I JOHN BENNISON of 36 City Road, Manchester in the County of Lancaster,
Marble Merchant and Manufacturer, do hereby declare the nature of my invention
of "IMPROVEMENTS IN CHIMNEY POTS FOR THE PREVENTION OF DOWN-DRAUGHT
AND CURING OF SMOKY CHIMNEYS," to be as follows:-
:-
The object of this invention is the construction of a chimney pot, whereby
down-draught is prevented and which at the same time shall present no obstacle
to the free egress of the smoke.
In performing my invention I construct the main shaft of the chimney pot by
preference of the usual cylindrical form-and I reduce the orifice or outlet slightly
in diameter. Surrounding this opening or outlet is a canopy of wider diameter
which extends down a short distance over the outside of the main shaft, and at
its upper extremity is reduced again to about the same diameter as the main
shaft.
This canopy on the inside is fluted-and flutes are also formed on the outside of
that part of the main shaft which is covered over by the canopy as aforesaid.
Rising from the canopy and supported on three or more brackets (which are
tapered inwards so as to present no parallel surface to the wind) is a cap to
prevent the entrance of wind or weather striking the chimney shaft in a vertical
direction.
The action of this improved chimney pot is as follows:-Owing to the internal
construction of the canopy whatever wind enters the chimney pot is immediately
deflected outwards again at the bottom of the canopy,-the flutes or grooves
serving to break up the current and thus render it impossible for any wind to
descend the main shaft.-This improved chimney pot can be constructed of pottery
or earthenware, sheet metal or other suitable material.

page_text: draught and Curing of Smoky Chimneys.
I JOHN BENNISON of 36 City Road Manchester in the County of Lancaster
Marble Merchant and Manufacturer do hereby declare the nature of my invention
of "IMPROVEMENTS IN CHIMNEY POTS FOR THE PREVENTION OF DOWN-DRAUGHT
AND CURING OF SMOKY CHIMNEYS," and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
The object of this invention is the construction of a chimney pot whereby
down-draught is prevented and which at the same time shall present no obstacle
to the free egress of the smoke.
On the accompanying drawing Fig. 1 is an exterior view and Fig. 2 a transverse
section of a chimney pot embracing my improvements Fig. 3 is a sectional plan
of Fig. 2 on line A-A and Fig. 4 a sectional plan of Fig. 2 on line B-B.
In performing my invention I construct the main shaft a of the chimney pot by
preference of the usual cylindrical form-and I reduce the orifice or outlet b
slightly in diameter. Surrounding this opening or outlet b is a canopy c of wider
diameter which extends down a short distance over the outside of the main shaft a
and at its upper extremity & is reduced again to about the same diameter as the
main shaft. This canopy c on the inside is fluted with flutes or grooves c³ c¹ and
flutes e e are also formed on the outside of that part of the main shaft which is
covered over by the canopy as aforesaid.
Rising from the canopy and supported on three or more brackets f (which are
tapered inwards so as to present no parallel surface to the wind) is a cap g to
prevent the entrance of wind or weather striking the chimney shaft in a vertical
direction.
The action of this improved chimney pot is as follows:-Owing to the peculiar
internal construction of the canopy c as aforesaid whatever wind enters the
chimney pot is immediately deflected outwards again at the bottom of the canopy-—
the flutes or grooves c¹ and e serving to break up, the current and thus render it
impossible for any wind to decend the main shaft a-This improved chimney pot
can be constructed of pottery or earthenware. sheet metal or other suitable
material.
Having thus particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
The improved construction of chimney pot substantially as and for the purposes
herein before described and illustrated on the accompanying drawing.