IMPROVEMENTS IN THE FORM AND CONSTRUCTION OF CHIMNEY TOPS OR APPLIANCES FOR SURMOUNTING CHIMNEYS, IN ORDER TO REGULATE THE UP-CURRENTS AND PREVENT THE DOWN-DRAUGHTS
Year: 1861

page_text: LETTERS PATENT to James Durrant, of Fitzroy Square, Zinc Worker,
and Noel Alleyne Harris, of Bayswater, Gentleman, both in the County
of Middlesex, for the Invention of "IMPROVEMENTS IN THE FORM AND
CONSTRUCTION OF CHIMNEY TOPS OR APPLIANCES FOR SURMOUNTING CHIMNEYS,
IN ORDER TO REGULATE THE UP-CURRENTS AND PREVENT THE DOWN-DRAUGHTS."
"
Sealed the 10th December 1861, and dated the 19th June 1861.
PROVISIONAL SPECIFICATION left by the said James Durrant and Noel
Alleyne Harris at the Office of the Commissioners of Patents, with
their Petition, on the 12th June 1861.
I, JAMES DURRANT, of Fitzroy Square, Zinc Worker, and I, NOEL ALLEYNE
HARRIS, of Bayswater, Gentleman, both in the County of Middlesex, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN THE
FORM AND CONSTRUCTION OF CHIMNEY TOPS OR APPLIANCES FOR SURMOUNTING
CHIMNEYS, IN ORDER TO REGULATE THE UP-CURRENTS AND PREVENT THE DOWN-
DRAUGHTS," to be as follows, that is to say:-
The object of our Invention is, by means of an apparatus fixed on the
chimney top, to increase the draught of the smoke and heated gases up the
chimney, and at the same time prevent the down-draughts of cold air.
Our apparatus consists of a cylinder of metal, preferably zinc, or earthen-
ware," or other suitable material. On the top of this we fix a series of
corrugated cells open at the bottom, so as to receive the external air, which
passes out at the top into the interior of the cone. The course of these cells

page_text: may be either slightly inclined or vertical; the band which forins them is
affixed to and opens into a conical cap, which also encircles the top of the
cylinder. Round the outer periphery or surface is another series of conically
corrugated cells, the bottoms of which are open so as to receive the outer air,
and pass it into the interior of another conical cap placed directly over it, and
concentrically with the cylinder; thus, by means of currents of air entering
from the lower mouths of these cells, and meeting the inclined surfaces of the
conical caps, they are reflected into the central part of the chimney top, and
mixing with the hot air increase the draught, and carry off the heated products
of combustion, while any external air entering at the top is carried out at the
lower mouths of the cells, and prevented from passing down the chimney.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Durrant and Noel Alleyne Harris in the Great Seal
Patent Office on the 12th December 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
DURRANT, of Fitzroy Square, Zine Worker, and NOEL ALLEYNE ILARRIS, of
Bayswater, Gentleman, both in the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of June, in the year of our Lord One
thousand eight hundred and sixty-one, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said James Durrant and Noel Alleyne Harris, Her special licence that we,
the said James Durrant and Noel Alleyne Harris, our executors, adminis-
trators, and assigns, or such others as we, the said James Durrant and Noel
Alleyno Harris, our executors, administrators, and assigus, should at any
time agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "IMPROVE-
MENTS IN THE FORM AND CONSTRUCTION OF CHIMNEY TOPS OR APPLIANCES FOR
SURMOUNTING CHIMNEYS, IN ORDER TO REGULATE THE UP-CURRENTS AND PREVENT
THE DOWN-DRAUGHTS," upon the condition (amongst others) that we, the said
James Durrant and Noel Alleyne Harris, our executors or administrators, by
an instrument in writing under our, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to be

page_text: filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Noel Alleyne Harris, on behalf of
myself and the said James Durrant, do hereby declare the nature of our
said Invention, and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement, that is
to say:-
Our Invention consists of a peculiarly formed apparatus, which we fix upon
the chimney top, the object being to increase the draught of the smoke and
heated gases up the chimney, and at the same time to obviate or greatly
prevent the down-draughts of cold air.
Our apparatus consists of a cylinder of metal, preferably zine, or carthen-
ware, or other suitable material. On the top of this we fix, or attach or form,
a series of corrugated cells opening towards the bottom, so as to receive the
external air, which passes out at the top into the interior of an open conical
cap fixed there. These cells may be either slightly inclined or vertical; the
band on which these cells are affixed, as before mentioned, opens into a conical
cap, which is affixed to and opens into and encircles the cylinder. Round the
outer periphery or surface is another series of conically-shaped cells, tho
bottom of which being open receive the outer air, and pass it into the interior
of another conical cap placed directly over it, and concentric with the
cylinder..
In order more clearly to shew the nature of our Invention, and how the
same is formed and acts, we have to this Specification appended the accom-
panying Drawings, which are intended to illustrate generally the form and
shape of our chimney can.
DESCRIPTION OF THE DRAWINGS.
a is tho
Figure 1 is an elevation of the simplest form of our apparatus.
cylindrical portion; 6 the corrugated cells attached to a, open at the lower
portion, so that the air rushes up and passes into the interior of the conical
cap c. When meeting the inclined sides of the latter, it, with the smoke and
gases, is carried along the centre of the apparatus into the next succeeding
conical cap d, fresh air being again received from the cells e and f, and sent
off into the atmosphere through the mouth g. It will be seen from the con-
struction that should air enter from the top, iusted of passing along the can
and down the chimney, it will pass outwards through the inclined cells e
and f, or the space between the outer and inner surfaces of the cones g and d,
or d and c.
a is tho
Figure 1 is an elevation of the simplest form of our apparatus.
cylindrical portion; the corrugated cells attached to a, open at the lower
portion, so that the air rushes up and passes into the interior of the conical
cap c. When meeting the inclined sides of the latter, it, with the smoke and
gases, is carried along the centre of the apparatus into the next succeeding
conical cap d, fresh air being again received from the cells e and f, and sent
off into the atmosphere through the mouth g. It will be seen from the con-
struction that should air enter from the top, iusted of passing along the can
and down the chimney, it will pass outwards through the inclined cells e
and f, or the space between the outer and inner surfaces of the cones g and d,
or d and c.

page_text: Figure 2 is a perspective elevation of a can.slightly modified from the last,
but still the same in principle; the base A being slightly different in form,
and another series of cells b¹ being introduced above the group b.
Having now described our Invention, and how the same is constructed,
made, and acts, we wish it understood that what we claim and desire secured
by the before in part recited Letters Patent is, the use and application of a
chimney top or chimney.can similar in form and principles of construction to
those shewn in Figures 1 and 2 of the Drawings appended, and substantially
as described in this Specification.
In witness whereof, I, the said. Noel Alleyne Harris, on behalf of
myself and the said James Durrant, have hereunto set my hand and
seal, this Twelfth day of December, One thousand eight hundred and
sixty-one.
Witness,
JAMES WRIGHT,
42, Bridge St., -Blackfriars,
London.
NOEL A. HARRIS. (L.S.)