Year: 1887

page_text: Date of Application, 5th Nov., 1887
Complete Specification Left, 3rd Aug., 1888
Complete Specification Accepted, 7th Sept., 1888
RESERVE CO
1 JOHN WRIGHT of 79 Corporation Street Manchester in the County of Lancaster
Estate Agent, do hereby declare the nature of this invention to be as follows:-
This invention relates principally to the construction of an improved chimney top
designed to create an upward current and to prevent the occurrence of down draught
in the flue or chimney and the same construction is also equally applicable as a
ventilator to extract foul air, or vapors, from apartments or other buildings or
places.
The lower portion or shaft of the improved chimney top is made in a cylindrical
form its upper part being slightly coned.
Brackets from this coned part support an outer cylindrical casing of a larger
diameter, and open at top and bottom, the lower edge of which is about midway up
the coned part of the shaft and the upper edge some distance above the top of the
said coned part.
The upper part of the outer cylinder las attached to it by brackets inside an inverted
conical block (either solid or hollow) the top of which is flush with the top of the said
outer cylinder and its lower point or apex just enters the mouth of a conical part at
the top of the shaft.
At a suitable distance above the top of the cylinder and the cone is supported a flat
conical cap the diameter of which is equal to that of the outer cylinder.
Any wind or current of air which blows across the top passing between the cap
and the top of the inverted cone and outer cylinder causes (by suction) an upward
current between the cone and the outer cylinder and thus induces an upward draught
in the chimney or flue.
And any wind or current of air which strikes lower down is directed by the coned
upper part of the shaft upwards between it and the outer cylinder and produces the
same effect. Whilst any downward wind or current of air striking the top is deflected
by the cap outside the outer cylinder or if it should enter between it and the cone it

page_text: is directed outside the coned part of the shaft and by suction causes an upward
current inside the same.
To increase the effect I sometimes adapt to the lower part of the shaft a series of
spiral taper tubes, the lower and larger ends of which are open to the atmosphere and
their upper and smaller ends open inside the shaft.
Any wind or current of air entering the outside openings will be caused to take a
spiral direction and when it enters the shaft will give an upward and spiral direction
to the draught.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.

page_text: I JOHN WRIGHT of 79 Corporation Street Manchester in the County of Lancaster
Estate Agent do hereby declaro 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 principally to the construction of an improved chimney top
designed to create an upward current and to prevent the occurrence of down draught
in the flue or chimney, and the same construction is also equally applicable as a
ventilator to extract foul air or vapors from apartments or other buildings or
places.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the sheet of drawings hereunto annexed and the following explanation thereof.
Fig. 1 is a vertical section of a chimney top constructed according to my invention.
Fig. 2 is a similar view of a slight modification thereof.
Fig. 3 is an exterior elevation of the same, with an addition hereinafter particularly
referred to, and
Fig. 4 is a further slight modification.
The lower portion or shaft a of the improved chimney top is made in a cylindrical
form, its upper part a being slightly coned.
Brackets b from this coned part support an outer cylindrical casing c of a larger
diameter and open at top and bottom, the lower edge of which is about midway up
the coned part a' of the shaft, and the upper edge some distance above the top of the
said coned part.
The upper part of the outer cylinder c has attached to it by brackets d inside, an
inverted conical block e (either solid or hollow) the top of which is flush with the top
of the said outer cylinder c and its lower point or apex just enters the mouth of the
conical part a¹ at the top of the shaft, or sometimes it is raised slightly higher as
shown at Fig. 2.
At a suitable distance above the top of the cylinder c and the cone e is supported a
flat conical capf, the diameter of which is equal to that of the outer cylinder c.
Any wind or current of air which blows across the top passing between the cap f
and the top of the inverted cone e and outer cylinder c causes (by suction) an upward
current between the cone and the outer cylinder and thus induces an upward draught
in the chimney or flue.
And any wind or current of air which strikes lower down, is directed by the coned,
upper part a of the shaft a upwards, between it and the outer cylinder c and produces
the same effect. Whilst any downward wind or current of air striking the top is
deflected by the cap foutside the outer cylinder, or if it should enter between it and
the cone e it is directed outside the coned part a¹ of the shaft and by suction causes
an upward current inside the same.

page_text: To increase the effect I sometimes adapt to the lower part of the shaft a series of
spiral taper tubes g as shown at Fig. 3, the lower and larger ends of which are open
to the atmosphere, and their upper and smaller ends open inside the shaft.
Any wind or current of air entering the outside openings will be caused to take a
spiral direction and when it enters the shaft a will give an upward and spiral direction
to the draught.
The above are shown on the drawings as made of terra cotta, but they may be made
of metal or other suitable material.
Fig. 4 is a modification which I propose sometimes to make in metal wherein two
plates or discs and i are substituted for the flat conical cap, and an additional outside
cylinder k is employed the top of which is between the two plates.
Having now 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 tops and ventilators substantially as herein-
before particularly described and illustrated by the drawings annexed.
1000
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.