Year: 1898

page_text: Date of Application, 10th May, 1898
Complete Specification Lett, 9th Feb., 1899-Accepted, 11th Mar., 1899
I, PHILIP ARTHUR NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, do hereby declare the
nature of this invention to be as follows:-
This invention relates to chimney hoods or cowls. Difficulty has heretofore been
experienced in providing a chimney cowl which will operate satisfactorily under
all conditions, and especially where the chimney is in close proximity to a wall
extending above the top of the chimney, on account of the different directions
from which the wind and reflected air currents strike the top of the chimney.
The invention aims especially to produce a chimney cowl which will act satis-
factorily under such and all conditions. To this end, in the preferred manner
of carrying out the invention, the cowl is formed of a series of hollow cones
formed, preferably of sheet metal, having smoke exit openings near their vertexes,
and arranged successively with the vertex and upper portion of each cone, except
the top one, extending into the cone above it, and with the lower cone extending
about the top of the chimney stack or chimney pot. The successive cones of the
series may be secured together, and to the chimney stack, in any suitable manner.
The cones are preferably supported so that the axes of alternate cones extend
obliquely in opposite directions, and the smoke exit openings of the cones are
formed in the sides of the cones and in the sides nearest parallel with the general
axis of the series. By this arrangement, the cones may be in such relation to
each other, that a line drawn from any point of the smoke exit opening in one cone,
cannot pass into the next lower cone through its smoke exit opening, this result
being accomplished without the use of overhanging or projecting caps for protect-
ing the smoke exit openings in the cones, whereby the free passage of the smoke
or hot air from the cones would be obstructed. When an air current strikes the
chimney cowl, therefore, although it may enter the smoke exit opening of the
uppermost cone, yet not matter at what angle it may strike, it cannot blow directly
into the smoke exit opening of the next lower cone. Further, when air entering
through the smoke exit opening of the upper cone strikes the inside of the opposite
side of the cone, and is reflected or thrown back therefrom, only a very small pro-
portion, if any, will enter the smoke exit opening of the next lower cone, and
there can consequently be, at the worst, but a very slight down draft through the
second cone; and when a third cone is provided, it will be practically impossible
for any downward current to enter the smoke exit, opening of such third cone,
to create a down draft through said cone. It is preferable, therefore, to form the
cowl with three or more cones, since, with this number of cones, the cowl may be
made so that it will be both theoretically and practically impossible for the wind
to cause any down draft to the top of the chimney, and the use of three or more
cones forms an important feature of the invention.
With this construction, moreover, the air striking the outside of the lower cones
will be reflected upward into the cones next above, thereby tending to create an
upward current of air past and through the smoke exit openings of the cones,

page_text: The cones may be right cones set obliquely, but it is preferable to use oblique
cones, so that the bases of the cones may be parallel, and at right angles to the
general axis of the series of cones, since such construction enables the smoke exit
openings of the lower cones to be well protected, while allowing a greater exposure
of the cones for the purpose of deflecting air upward, than when right cones set
obliquely are employed.
The smoke exit opening of the top cone may be formed by cutting off the
vertex of the cone in a horizontal plane, so that the wind, unless it strike directly
downward, will not enter the top cone, from whichever way it may blow.
NEWTON & SON,
Agents for the Applicant.
Sumney COWIS.
I, PHILIP ARTHUR NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, 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 relates to chimney hoods or cowls. Difficulty has heretofore been
experienced in providing a chimney cowl which will operate satisfactorily under
all conditions, and especially where the chimney is in close proximity to a wall
extending above the top of the chimney on account of the different directions
from which the wind and reflected air currents strike the top of the chimney.
The invention aims especially to produce a chimney cowl which will act satis-
factorily under such and all conditions. To this end, in the preferred manner
of carrying out the invention, the cowl is formed of a series of hollow cones
formed preferably of sheet metal. having smoke exit openings near their vertices,
and arranged successively with the vertex and upper portion of each cone, except
the top one, extending into the cone above it, and with the lower cone extending
about the top of the chimney stack or chimney pot. The successive cones of the
series may be secured together, and to the chimney stack, in any suitable manner.
The cones are preferably supported so that the axes of alternate cones extend
obliquely in opposite directions, and the smoke exit openings of the cones are
formed in the sides of the cones and in the sides nearest parallel with the general
axis of the series. By this arrangement, the cones may be in such relation to
each other, that a line drawn from any point of the smoke exit opening in one cone.
cannot pass into the next lower cone through its smoke exit opening. this result
being accomplished without the use of overhanging or projecting caps for protect-
ing the smoke exit openings in the cones, whereby the free passage of the smoke
or hot air from the cones would be obstructed. When an air current strikes the
chimney cowl, therefore, although it may enter the smoke exit opening of the
uppermost cone, yet no matter at what angle it may strike, it cannot blow directly
into the smoke-exit opening of the next lower cone. Further, when air entering
through the smoke exit opening of the upper cone strikes the inside of the opposite
side of the cone, and is deflected or thrown back therefrom, only a very small pro-
portion, if any, will enter the smoke exit opening of the next lower cone. and
there can consequently be, at the worst, but a very slight down-draught through the
second cone; and when a third cone is provided, it will be practically impossible
for any downward current to enter the exit opening of such third cone, to
create a down-draught through said cone. It is preferable, therefore, to form the

page_text: cowl with three or more cones, since, with this number of cones, the cowl may be
made so that it will be both theoretically and practically impossible for the wind
to cause any down-draught to the top of the chimney, and the use of three or more
cones forms an important feature of the invention.
With this construction, moreover, the air striking the outside of the lower cones
will be reflected upward into the cones next above, thereby tending to create an
upward current of air, past and through the smoke exit openings of the cones.
The cones may be right cones set obliquely, but it is preferable to use oblique
cones, so. that the bases of the cones may be parallel, and at right angles to the
general axis of the series of cones, since such construction enables the smoke exit
openings of the lower cones to be well protected, while allowing a greater exposure
of the cones for the purpose of deflecting air upward, than when right cones set
obliquely are employed.
The smoke exit opening of the top cone may be formed by cutting off the
vertex of the cone in a horizontal plane, so that the wind, unless it strikes directly
downward, will not enter the top cone, from whichever way it may blow.
The accompanying drawings shew preferred constructions embodying various
features of the invention.
Figure 1 shows, in elevation, the preferred form of cowl embodying the invention.
Figure 2 is a section on line 2 of Figure 1.
Figure 3 is a sectional view similar to Figure 2, but shewing a slightly modified
construction.
Referring to the drawings, the cowl is formed of a series of hollow cones, 10,
formed preferably of sheet metal, & arranged successively with the vertex &
upper portion of one cone extending, into the cone above, and with the lower cone
extending about the top of the chimney stack or chimney pot, 11. The successive
cones of the series may be secured together, and to the chimney-stack, in any
suitable manner, as by brackets or arms, 12. Near the top of each cone is a
smoke exit opening, 13.
In the preferred construction shewn, the cones are supported so that the axes of
the cones extend obliquely in opposite directions. alternately and the openings 13
are formed in the sides of the cones nearest parallel with the general axis of the
series.
By this arrangement, the cones may be in such relation to each other that a line
drawn from any point of the opening 13 in one cone, cannot pass into the next
lower cone through its opening 13, this result being accomplished without the use
of overhanging, or projecting caps for protecting the openings. 13, whereby the
free passage of the smoke or heated air from the cone would be obstructed.
It will be seen, by referring to the drawings, that with the cones arranged as
above described, and as shewn, when an air current strikes the chimney cowl, say,
from the right in Figure 2, it will enter the opening 13 of the uppermost cone,
but that, no matter at what angle it may strike, it cannot blow directly into the
opening 13 of the next lower cone, since, as above stated, the cones, in the pre-
ferred arrangement shown, are so related that a line drawn from any point in the
opening 13 of the upper cone, cannot enter the next lower cone through its open-
ing 13. Also, when air entering through the opening 13 of the upper cone strikes
the inside of the opposite side of the cone, and is deflected or thrown back therefrom,
only a very small proportion, if any, will enter the opening 13 of the next lower
cone. There can consequently be, at the worst, but a very slight down-draught
through the second cone, and, when a third cone is provided as shown in the draw-
ings. it will be practically impossible for any downward current to enter the open-
It is pre-
ing 13 of such third cone, to create a down-draught through said cone.
ferable, therefore, to form the cowl with three or more cones, since, with this
number of cones, the cowl may be made so that it will be both theoretically &
practically impossible for the wind to cause any down draught to the top of the
chimney, and the use of three or more cones forms an important feature of the
invention.

page_text: With this construction, moreover, the air striking the outside of the lower cones
will be reflected upwardly into the cones next above, thereby tending to create an
upward current of air past and through the openings 13.
The cones 10 may be right cones set obliquely, as in Figure 3-but it is preferable
to use oblique cones, so that their bases may be parallel and at right angles to the
general axis of the series of cones, as in Figures 1 and 2, since thereby the open-
ings 13 of the lower cones will be well protected, while allowing a greater exposure
of the cones for the purpose of deflecting air upward, than in the arrangement
shewn in Fig. 3.
.
Figure 3 shows, also, the top cone with the opening 13 formed by cutting off the
vertex of the cone in a horizontal plane, so that a current of air, unless it strike
downward, will not enter the top cone, from which ever way it may blow. It is
evident that this feature of cutting off the vertex of the top cone in a horizontal
plane might equally well be applied and would be equally useful, where the cones
forming the cowl are oblique cones, such as are shewn in Figures 1 and 2.
Other modifications within the invention, as defined in the claims. will doubt-
less suggest themselves.
Having now particularly described and ascertained the nature of the said inven-
tion & in what manner the same is to be performed (as communicated to me from
abroad), I declare that what I claim is:-
1. A chimney cowl formed of a plurality of hollow cones arranged with the
vertex of each cone, except the top one, extending into the cone above it, said
cones having openings near their vertices, substantially as described.
2. A chimney cowl formed of a plurality of hollow cones arranged with the
axes of the cones set obliquely in opposite directions alternately, and with the vertex
of each cone except the top one extending into the cone above it, and said cones
having openings near their vertices in the sides nearest parallel with the general
axis of the series, substantially as described.
3. A chimney cowl formed of three or more hollow cones arranged with the
axes of the cones set obliquely in opposite directions alternately and with the vertex
of each cone except the top one, extending into the cone above it, and said cones
having openings near their vertices in the sides nearest parallel with the general
axis of the series, substantially as described.
4. A chimney cowl formed of a plurality of hollow cones arranged with the axes
of the cones set obliquely in opposite directions alternately and with the vertex of
each cone except the top one extending into the cone above it, and said cones, except
the top one, having openings near their vertices in the sides nearest parallel with
the general axis of the series, said top cone having its vertex cut off in a horizontal
plane, substantially as described.
5. A chimney cowl formed of a plurality of hollow oblique cones arranged with
their bases parallel, and their axes extending alternately in opposite directions,
and with the vertex of each cone, except the top one, extending into the cone above
it, and said cones having openings near their vertices, the openings in one or more
of the cones being in the sides nearest parallel with the general axis of the series,
substantially as described.
6. A chimney cowl formed substantially as shewn and described.
NEWTON & SON,
Agents for the Applicant.