Ax IMPROVED CONSTRUCTION OF CHIMNEY Por
Year: 1875

page_text: LETTERS PATENT to Samuel Edward Knight, of Lordship Terrace,
Clapham Road, New Wandsworth, in the County of Surrey, for the
PROVISIONAL SPECIFICATION left by the said Samuel Edward Knight
at the Office of the Commissioners of Patents, with his Petition,
on the 8th July 1875.
I, SAMUEL EDWARD KNIGHT, of Lordship Terrace, Clapham Road,
5 New Wandsworth, in the County of Surrey, do hereby declare the
nature of the said Invention for "Ax IMPROVED CONSTRUCTION OF CHIMNEY
Por," to be as follows:-
The object of this Invention is so to construct zinc and other pots
for chimney tops as to ensure a quick up draught and a consequent
removal of all tendency to down draught, while at the same time no
obstacle is presented to the passage upwards of the chimney sweeper's

page_text: broom, and no opportunity is afforded for the soot to accumulate in or
around the pot and interfere with its efficient action.
The chimney pot I make cylindrical, or nearly so, in its interior, and
I form in the walls of the pot openings, which are covered by an annular
screen or hood of a diameter sufficiently large to permit of air passing
under the screen or hood and through the lateral openings covered by
it, so as to create an up draught in the chimney to which the pot is
applied. Of these screens or hoods for covering the lateral openings
there may be one, two, or more, according to the length of the pot, and
further to assist the up draught I provide the pot, both above and below
the uppermost hood with a short trumpet mouth air passages, through
which streams of air admitted to the pot will be directed upwards.
When the wind strikes a pot of this construction instead of finding
its way into the pot and passing down into the chimney, as is commonly
the case, it will be directed upwards, and meeting with no obstructions
will escape at the top of the pot and induce an upward current of the
smoke from the chimney, thereby quickening the fire and remedying
the inconveniences, where such exist, of a smoky chimney.
31
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Edward Knight in the Great Seal Patent
Office on the 8th January 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
EDWARD KNIGHT, of Lordship Terrace, Clapham Road, New Wands-
worth, in the County of Surrey, send greeting.
.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of July, in the year of our
Lord One thousand eight hundred and seventy-five, in the thirty-
ninth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Samuel Edward Knight, Her special
licence that I, the said Samuel Edward Knight, my executors, admi-

page_text: nistrators, and assigns, or such others as I, the said Samuel Edward
Knight, 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 make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"AN IMPROVED CONSTRUCTION OF CHIMNEY POT," upon the condition (amongst
others) that I, the said Samuel Edward Knight, my executors or admi-
nistrators, 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 Invention, and in what manner the same was to be
performed, and cause the same 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 Samuel Edward Knight, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described' and ascertained in and
by the following statement, reference being had to the Drawing hereunto
annexed, and to the letters and figures marked thercon (that is to
say):
The object of this Invention is so to construct zinc and other pots.
for chimney tops as to ensure a quick up draught, and a consequent
removal of all tendency to down draught, while at the same time no
obstacle is presented to the passage upwards of the chimney sweeper's
broom, and no opportunity is afforded for the soot to accumulate in or
around the pot and interfere with its efficient action.
The chimney pot I make either cylindrical or slightly conical, and I
form in the walls of the pot a ring or rings of openings, which are
covered externally by an annular screen or hood of a diameter sufficiently
large to permit of air passing under the screen or hood and through the
lateral openings covered by it, so as to creato an up draught in the
chimney to which the pot is applied.
The further to assist the up draught I provide the pot, both above
and below the uppermost hood, with air passages so formed as to give
the streams of air admitted to the pot an upward direction.
In the accompanying Drawing Fig. 1 shows an external elevation of
my improved pot; and Fig. 2 is a vertical section of the same; Fig. 2.

page_text: is a parmai norizontal section of the improved pot on the fine X, X, OL
Fig. 2.
In these Figures the pot is represented as made of "terra cotta,"
which will be the usual material employed, but it may also be made of
zinc or of galvanized sheet iron.
A is a taper, or it may be a cylindrical tube, open at top and bottom
to allow of a free passage through it of the smoke of the chimney to
which it is to be applied. a, a', a³, are rings of openings made in the
tube for admitting currents of air to the interior. These openings are
severally covered internally by curved deflectors, which reach up above
the top part of the opening. These deflectors are formed in one piece
with the pot when the same is moulded, but when the pot is made of
metal they will be soldered thereto, and thus constitute passages for
conducting ascending currents of air into the pot; b, b, are lateral
openings made through the walls of the pot, and overlying them
externally is an annular hood B, which serves to conduct air to the
openings b. The deflectors to the holes a, a', are joined at bottom to
the tube A, but at their upper ends they form a curved opening for the
passage upwards of the air. I find however that it is desirable in the
case of the deflectors of the ring of holes a³ to leave an opening at their
lower part, as shown at Fig. 2, as a slight quickening of the up draught
is thereby obtained.
From the foregoing description it will be understood that when the
wind strikes a pot of this construction, instead of finding its way into
the pot and passing down into the chimney, as is commonly the case,
it will be directed upwards, and meeting with no obstructions will
escape at the top of the pot and induce an upward current of the
smoke from the chimney, thereby quickening the fire and remedying
the inconveniences, where such exit, of a smoky chimney.
This construction of pot readily adapts itself to ornamentation, as the
hood or screen, as well as the top edge of the pot, may be fretted or
indented at their edges to produce any desired pattern.
Having now set forth the nature of my Invention of "An Improved
Construction of Chimney Pot," and explained the manner of carrying the
same into effect, I wish it to be understood that under the above in part
recited Letters Patent I claim, the construction of pot above described,
whereby all lodgment of soot is prevented, and the external air admitted
:

page_text: thereto is caused to ascend and induce an upward current of the smoke
from the chimney.
In witness whereof, I, the said Samuel Edward Knight, have here-
unto set my hand and sael, this Seventh day of January in the
year of our Lord One thousand eight hundred and seventy-
six.
SAMUEL E. KNIGHT. (L.S.)