IMPROVEMENTS IN CHIMNEY AND VENTILATING COWLS
Year: 1861

page_text: LETTERS PATENT to George Lewingdon, of Bridport, in the County of
Dorset, Woollen Draper, for the Invention of "IMPROVEMENTS IN CHIMNEY
AND VENTILATING COWLS."
Sealed the 16th July 1861, and dated the 17th January 1861.
PROVISIONAL SPECIFICATION left by the said George Lewingdon
at the Office of the Commissioners of Patents, with his Petition, on
the 17th January 1861.
I, GEORGE LEWINGDON, of Bridport, in the County of Dorset, Woollen
Draper, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN CHIMNEY AND VENTILATING COWLS," to be as follows:-
My improved cowls are composed of two main parts. The lower part is
fixed, and the upper part is free to revolve round a pin or stud supported by
the lower part. On the lower part I fit a conical ring or collar, with conical
apertures leading from the bottom of the collar into the inside of the channel
in communication with or in continuation of the chimney or shaft on which
the cowl is placed. The movable part is formed at top with a lobster back,
and carries near the top and across the interior a shaft with two or more fan
blades, which are made to revolve by a screw wheel fixed on the same shaft
and on the outside of the cowl, which wheel is made to revolve by the wind.
Just below the fan shaft I place a guard, which extends across about one half
of the interior of this upper part of the cowl. The wind entering the conical

page_text: apertures in the ring on the
revolution of the fan shaft in
lower part of the cowl, together with the
the upper part, impart an upward draft to the
smoke and vitiated air in the chimney or other shaft, while the fans on the
shaft and the guard in the upper part of the cowl prevent down draft.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Lewingdon in the Great Seal Patent Office on the
17th July 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
LEWINGDON, of Bridport, in the County of Dorset, Woollen Draper, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of January, 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 beirs and successors, give and grant unto me,
the said George Lewingdon, Her special licence that I, the said George
Lewingdon, my executors, administrators, and assigns, or such others as J,
the said George Lewingdon, 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 "IMPROVEMENTS IN CHIMNEY AND VENTILATING COWLS," upon the condition
(amongst others) that I, the said George Lewingdon, 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 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 George Lewingdon, 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 thereof, reference being had to the Drawings hereunto
annexed, that is to say :-
My improved cowls are composed of two main parts. The lower part is
fixed, and the upper part is free to revolve round a pin or stud supported by

page_text: the lower part. On the lower part I fit a conical ring or collar, with conical
apertures leading from the bottom of the collar into the inside of the channel
in communication with or in continuation of the chimney or shaft on which
the cowl is placed. The movable part is formed at top with a lobster back,
and carries near the top and across the interior a shaft with two or more fan
blades, which are made to revolvo by a screw wheel fixed on the same shaft
and on the outside of the cowl, which wheel is made to revolve by the wind.
Just below the fan shaft I place a guard, which extends across about one half
of the interior of this upper part of the cowl.
Figure 1 of the accompanying Drawings is an external elevation of a cow!
constructed according to my Invention, and Figure 2 is a longitudinal section
of the same. a is the lower, and 6 the upper part of the cowl; c is a rod
fixed to a cross bar in the lower part a, upon and round which the upper
part 6 is free to revolve; d is the conical ring or collar formed round the
lower part a, provided with apertures e, e, leading to apertures f,f, in the sido
of the lower part a; g is the lobster back at the upper part of the cowl; his
a shaft passing through the upper part 6 of the cowl, and free to revolve in
bearings or sockets on the outside thereof. The shaft h carries fan blades i, i,
inside the upper part of the cowl; k is a fan outside the cowl, fixed on the
shaft h, and by which the blades are caused to revolve; / is the guard beneath
the fan blades. The action is as follows:-The wind entering the conical
apertures e, e, in the ring d on the lower part a of the cowl, together with the
revolution of the fan shaft h in the upper part, impart an upward draft to the
smoke and vitiated air in the chimney or other shaft, while the fans i, i,
on the shaft h, and the guard / in the upper part 6 of the cowl, prevent down
draft.
b
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim the construction
of chimney and ventilating cowls, substantially in manner herein-before
described and illustrated in the accompanying Drawings.
In witness whereof, I, the said George Lewingdon, have hereunto set
my hand and seal, this Sixteenth day of July, One thousand eight
-hundred and sixty-one.