A NEW OR IMPROVED CHIMNEY POT OR TOP
Year: 1858

page_text: LETTERS PATENT to John Richard Chirm, the younger, of Birmingham,
in the County of Warwick, Auctioneer and Surveyor, for the Invention
of "A NEW OR IMPROVED CHIMNEY POT OR TOP."
Sealed the 12th October 1858, and dated the 17th April 1858.
PROVISIONAL SPECIFICATION left by the said John Richard Chirm at
the Office of the Commissioners of Patents, with his Petition, on the
17th April 1858.
I, JOHN RICHARD CHIRM, the younger, of Birmingham, in the County of
Warwick, Auctioneer and Surveyor, do hereby declare the nature of the
Invention for "A NEW OR IMPROVED CHIMNEY POT OR TOP," to be as follows:-
My said Invention consists of a chimney pot or top, the upper part or the
whole of which has the figure of a three-sided prism, or in cross section the
figure of a triangle. The summit of each side of my new or improved chimney
pot or top is bevilled off from its middle to its edges, so as to present a
termination of the form of two sides of a triangle, or the said summits may be
rounded or have other ornamental figure. I prefer to curve or bend the

page_text: summit of each side of the chimney pot outwards, but I do not confine myself
thereto, as the said sides may be upright with nearly the same effect.
Chimnies terminated with my new or improved chimney pot or top are less
liable to have the smoke blown down them by the wind than chimnies having
chimney pots of the ordinary construction, for in whatever direction the wind
blows
upon a chimney pot made according to my Invention there is a tendency
in my said chimney pot to deflect the wind or to permit its ready escape from
the side of the chimney pot opposite to that at which it entered. The
triangular figure of my improved chimney pot more effectually prevents the
entrance of wind into its interior than an ordinary chimney pot.
My new or improved chimney pot may be made of various materials, and is
capable of being made in a great variety of ornamental forms.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Richard Chirm in the Great Seal Patent Office on the
14th October 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
RICHARD CHIRM, the younger, of Birmingham, in the County of Warwick,
Auctioneer and Surveyor, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of April, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Richard Chirm, Her special licence that I, the said John Richard
Chirm, my executors, administrators, and assigns, or such others as I, the
said John Richard Chirm, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
nake, use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"A NEW OR IMPROVED CHIMNEY POT OR TOP," upon the condition (amongst
others) that I, the said John Richard Chirm, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said Inven-
tion, and in what manner the same was to be performed, and cause the same

page_text: to be 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 John Richard Chirm, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:
My said Invention consists of a chimney pot or top constructed in the
manner herein-after particularly described, and represented in the accompanying
Drawing.
Figure 1 represents in elevation a chimney pot or top constructed according
to my Invention.
It consists of three planes a, b, and c, joined together
longitudinally so as to form a three-sided prism, or a figure which is in transverse
section a triangle. The summit of each side of my new or improved chimney
pot or top is bevilled off from its middle to its edges, so as to present a
termination of the form of two sides of a triangle. The said terminations are
marked a¹, b', and c¹, respectively in Figure 1; the chimney pot or top a, b, c,
is supported upon a circular base d. Although I prefer to make my new or
improved chimney pot or top in the manner represented in Figure 1, yet the
body of the chimney pot may be made cylindrical, the upper part only having
the figure of a three-sided prism; or the body of the chimney top may be
made of any desired ornamental form, the upper part only having the figure
represented in Figure 1. My new or improved chimney pot or top may be
made either of metal, slate, or terra cotta, or other material of which chimney
pots are or may be made. When I make my improved chimney pot or top
of terra cotta or other brittle material, I prefer to strengthen the terminations
a, b, c, by making the said terminations thicker at their middles than at
their edges, as represented in Figure 1, and also in several of the other
Figures. When I make my improved chimney pot or top of sheet iron or
other metal, I prefer to strengthen the terminations a, b, c, by making a
flute rib or corrugation extending along the edges or up the middles of the
said terminations. When I make my improved chimney pot or top of slate
or other material which can only be had in the form of flat plates or slabs, I
make the said chimney pot with plane sides, as represented in Figure 1; but
when I make my chimney pot of terra cotta or sheet metal, which can be
readily moulded or bent into a curved form, I prefer to curve or bend the
summit of each side of the chimney pot out outwards, as represented in
elevation in Figure 2, and in plan in Figure 3, the terminations e, f, g, being
bent outwards out of the planes in which the sides of the chimney pot are

page_text: situated. Figure 4 represents in elevation a chimney pot similar to that
represented in Figure 2, excepting that it has a hexagonal base h, instead of
the circular base represented in Figure 2. The section of one of the sides,
Figure 4, illustrates my method of strengthening the terminations by giving
additional thickness; Figure 5 represents in plan the chimney pot, Figure 4.
Figure 6 represents another modification of my Invention, the said chimney
pot, Figure 6, differing from the chimney pot, Figure 4, in the following
respect, namely, the terminations instead of being inclined outwards in a
curved form, consist of planes jointed at k to the sides of the chimney pot,
each termination forming an obtuse angle with the sides of the chimney pot,
which it terminates. A comparison of the section 1, Figure 6, with the
section i, Figure 4, will suffice to render evident the difference between the
chimney pots, Figures 4 and 6. I sometimes give an ornamental character to
the terminations of the sides of my new or improved chimney pot as
represented in the several designs, Figures 7, 8, and 9. The planes in which
the terminations are situated being in every case those of a three-sided
prism.
Chimneys terminated with my new or improved chimney pot or top are less
liable to have the smoke blown down them by the wind, than chimneys having
chimney pots of the ordinary construction, for in whatever direction the wind
blows upon a chimney pot made according to my Invention, there is a tendency
in my improved chimney pot to deflect the wind, or to permit its ready escape
from the side of the chimney pot opposite to that at which it entered. When
the wind blows against one termination of my chimney pot, as indicated by
the arrows in Figure 3, the smoke readily escapes through the opening imme-
diately opposite the side f, against which the wind blows. When the wind
blows against two sides of my chimney pot, as indicated by the arrows in
Figure 5, the wind can only enter at the corner where the two sides join,
against which the wind is blowing, and as the angle included between the said
two sides is only an angle of sixty degrees, a small proportion only of the wind
enters at the said corners, whilst the summits of both sides afford a shelter
behind which the smoke ascends and passes off at the other corners.
Having now described the nature of my Invention, and the manner
of carrying the same into effect, I wish it to be understood that I do not
limit myself to the precise details herein described, as the same may be
varied without departing from the nature of my Invention; but I claim
as my Invention the new or improved chimney pot or top herein-before
described and illustrated in the accompanying Drawing, that is to say, a

page_text: chimney pot or top, the upper part or the whole of which has the figure of a
three-sided prism, each of the sides of the chimney pot being bevilled off so as
to present a termination of the form of two sides of a triangle, or have an
ornamental figure such as may be cut from or inscribed within two sides of a
triangle, whether the said terminations be situated parallel to the axis of the
chimney pot, or in planes inclined outwards from the axis of the chimney pot
as described and represented.
In witness whereof, I, the said John Richard Chirm, have hereunto
set my hand and seal, this Thirteenth day of October, in the year
of our Lord One thousand eight hundred and fifty-eight.
Witness,
GEORGE SHAW.
JOHN RICHARD CHIRM, JUN³. (L.S.)