IMPROVED APPLIANCES FOR INDUCING AIR OR GASEOUS FLUIDS FROM CHIMNEYS, OR OTHER STACK PIPES, FOR THE PRE- VENTION OF DOWN DRAUGHTS, AND FOR THE PURPOSES OF VENTILATION "
Year: 1883

page_text: LETTERS PATENT to Hermon Burgin of Walthamstow in the County of Essex
Gentleman for an Invention of "IMPROVED APPLIANCES FOR INDUCING AIR
OR GASEOUS FLUIDS FROM CHIMNEYS, OR OTHER STACK PIPES, FOR THE PRE-
VENTION OF DOWN DRAUGHTS, AND FOR THE PURPOSES OF VENTILATION
"
PROVISIONAL SPECIFICATION left by the said Hermon Burgin at the Office
of the Commissioners of Patents on the 27th June 1883.
HERMON BURGIN of Walthamstow in the County of Essex, Gentleman.
"IMPROVED APPLIANCES FOR INDUCING AIR OR GASEOUS FLUIDS FROM CHIMNEYS,
OR OTHER STACK PIPES, FOR THE PREVENTION OF DOWN DRAUGHTS, AND FOR
THE PURPOSES OF VENTILATION
"
This Invention has for its object improvements in appliances for inducing air, or
other gaseous fluids, from chimneys or stack pipes, or for ventilation purposes, by
which means, down draughts are prevented. The invention consists in a new
form of chimney cowl, of such a construction, as to promote induction, the air
currents alone effect this without causing any part to revolve for the purpose.
A perpendicular tube is fixed on the top of the flue or pipe, around which tube
is an outer one having vertical apertures, each independent of the adjoining one,
by the employment of vertical divisions, resembling in section the letter T. The
air rushes into these spaces and ascends behind the overhanging or overlapping parts.
The outer cylinder or air inlet, terminates above the chimney proper or pipe
froin which the air or gaseous bodies are to be exhausted.
The air thus being shielded for a short distance, effects the object of this
invention.
In some cases near the top I propose to use a conical shield, around the outside,
with partitions, or divisions, corresponding with those on the interior, so that
further air currents may be secured, and diffused from the cone. It is not proposed
that this cone should touch the cylinder but it is advantageously placed a slight
distance therefrom so as to leave an annular space for the said diffusion.
According to a modification I dispense with the outer cylinder, and in lieu
thereof, employ a series of perpendicular shields, or divisions, of the T section,
with the intermediate flange secured to the tube.
The said divisions may be of an L section, or instead of these divisions as before
described, open tubes may be employed or the outer cylinder can be corrugated as
may be desired.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Hermon Burgin in the Great Seal Patent Office on the
22nd December 1883.
HERMON BURGIN of Walthamstow in the County of Essex Gentleman
"IMPROVED APPLIANCES FOR INDUCING AIR OR GASEOUS FLUIDS FROM CHIMNEYS,
OR OTHER STACK PIPES, FOR THE PREVENTION OF DOWN DRAUGIITS AND FOR
THE PURPOSES OF VENTILATION
"
This Invention has for its object improvements in appliances for inducing air or
other gaseous fluids_from_chimneys_or_stack_pipes, or for ventilating purposes, by
means of which down draughts are prevented.
My invention consists in a new form of chimney or ventilating cowl of such
construction as bereafter described, to promote induction, the air currents alone
serving to effect this without the intervention of any mechanical contrivance.
In order that my invention may be the better understood I will now proceed
to describe the same with reference to the accompanying sheet of Drawings, in
which similar letters of reference apply to similar parts throughout the various
figures.
Figure 1 is an elevation of my improved cowl and Figure 2 is a perspective
view of the same. Figure 3 is a plan of the top-in these figures A is a perpen-
dicular tube which is fixed on the top of the flue or pipe either for ventilation or
smoke as may be required; around this tube is an outer one B having vertical
apertures C, each independent of the adjoining one as shown at all the figures, and
divided from each other by the employment of vertical divisions forming a
T section as shown at D Figures 2, 3, and 4, which latter figure is a section
through y Fig 1.
By these means it will be seen that the air on striking the cowl from any one
point will rush up those spaces, and ascend behind the overhanging or overlapping
parts. The outer cylinder, or air inlet B, terminates above the chimney proper, or
pipe A, from which the air or gaseous bodies are to be exhausted. The air, by
these means being shielded for a short distance, effects the objects of this
invention.
Around the outside of this I place a conical shield E, with partitions or
divisions G, as shown at Figures 1 and 2, and in plan at Figure 3, so that a further
uniform current of air may be secured and an upward tendency of air maintained.
Between this shield and the main tube A there may be an annular space for the
better diffusion of the air currents, although curved spaces F are shown in the
drawings, and which I find advantageous to employ.
In some cases when through the position of the buildings surrounding, or
through the intervention of trees, a very pronounced down draught is produced,
I use a convenient form of cap of plain conical shape, or such as shown in section
at H in the sectional elevation Figure 5.
In my invention it will be seen that it differs from others having the same
object in view, in that the air for the purpose of increasing the updraught does
not come into contact at any point with the smoke or other noxious vapour, until
such vapour has escaped into the atmosphere at a point below the outlet by and
in which the upward draught or exhaust is effected. Figure 6 shows the
adaptation to the flue of external L shaped pieces for the aforesaid purpose.
Figure 7 shows the employment of a surrounding corrugated plate, or the flue
may be corrugated as shewn at Figure 8.
Having thus described my invention I would have it understood that what
1 claim is
The construction of a smoke or ventilating cowl with a cylinder surrounded by

page_text: an outer cylinder, forming an annular space, having in it vertical apertures or
divisions, through or by which the currents of air for the purpose of creating an
updraught is effected in the manner herein described and illustrated with reference
to the accompanying drawings.
In witness whereof I the said Hermion Burgin havo hereunto set my hand and
scal this Eighteenth day of December-in the year of our Lord One thousand eight
hundred and eighty three.
Witness
JAS FRED PHILLIPS
of the firm of
Phillips & Leigh
Patent Agents
22 Southampton Buildings
W.C.
HERMON BURGIN (1..s.)