An Improved Extracting Cowl.
Year: 1890

page_text: Date of Application, 22nd Jan., 1890
Complete Specification Left, 2nd Apr., 1890-Accepted, 3rd May, 1890
PROVISIONAL SPECIFICATION.
An Improved Extracting Cowl.
I, CHARLES JOSEPH HUNTER of 11 Countess Street Whitley, Newcastle on Tyne
in the county of Northumberland Gentleman, do hereby declare the nature of this
invention to be as follows:-
My invention has for its object the extraction thro' flues or shafts of smoke or foul-
gasses. I construct my improved cowl in part of a circular pipe which fits on to or is
built in over the opening of the flue or shaft. Upon this pipe a tube is mounted one
above a series of mutilated cover shaped caps the bases of which project, considerably
over the pipe aforementioned these caps are held one above another at the required
distance by angle irons or stays rivetted together and about three stays are required
to hold up each cap and are arranged to divide the space on plan equally. The sides
of the cone shaped cap slope at about an angle of 45 degrees but I do not limit myself
to this particular angle. The top cap has not a hole in its centre like all the others
but is made in the form of a perfect hollow cone or pyramid. It will be readily
understood when the wind blows against the cone shaped caps the air is thrown
upwards and a suction is caused within the shaft or flue inducing an up current. I
propose to make my improved cowl of galvanised iron or steel of stout gauge.
As my improvements are capable of some modifications without departing from
the principle thereof I do not restrict myself to materials, dimensions or to the precise
form or placement of the several parts thereof.
Dated this 22nd day of January 1890.
RAYNER & CASSELL,
37, Chancery Lane, London,. W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Extracting Cowl..
I, CHARLES JOSEPH HUNTER of 11 Countess Street Whitley Newcastle on Tyne in
the county of Northumberland Gentleman do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The object of my invention is to form a cowl to be placed on the top of a smoke or
foul air flue for the purposes of acting as an extractor to the flue. My improved
cowl is circular on plan and the lower part consists of a pipe or tube of sufficient
sectional area for the proper passage through it of the extracted air from the flue.
This lower part may be built into the brickwork of the flue or shaft, or may be other-
wise firmly fixed and connected to such flue or shaft but is without any external
openings between the two. On the top of the tube or pipe aforementioned I now fix
by means of three iron stays a hollow and bottomless truncated cone. The diameter
of the base of this cone is about twice that of the pipe upon which it is fixed and on
plan it forms parellel lines with the plan of the pipe which is to say it is placed
centrally over such pipes upon this truncated hollow cone I mount another and similar
truncated cone in exactly the same manner and by the same means as the first one.
Upon the second truncated cone I mount by similar stays as before and in a similar
manner a perfect hollow cone. The stays or angle irons, by means of which the
various parts of my improved cowl is held together are equi-distant from each other
on plan and are rivetted to the cones and pipe as shown. The angle which the sides
of these cones make with the horizon is about 40% and this is about the angle I
prefer to use. In the geometrical elevation of my improved cowl the pipe (connected

page_text: immediately with the flue) enters slightly into the first truncated cone, but the upper
cones have a clear elevational space between each other.
In order that my improvements may be more fully understood I will now proceed
to describe the figure upon the accompanying drawing which is marked with letters
of reference agreeing with this description.
The illustration which I here give iny improved cowl is an elevation in which A is
the tube or pipe before mentioned B is the first truncated cone placed over this pipe
and C a further truncated cone placed above B. D is the hollow cone placed at the
top of my cowl the stays or supports are marked E. It will readily be seen that
when the wind blows against the cowl it will be thrown in an upward direction by
the sides of the cones, and this, will have a tendency to create a vacium in the flue and
thus the extraction of the foul atmospheres will be effected. I propose to form my
improved cowl in galvanized iron or steel of sufficiently stout guage and the angle
'irons or stays will also be galvanized or painted. I do not limit myself to the number
of truncated cones which I may employ in the construction of my cowl or the exact
angle their sides form with the horizon.
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
An extracting cowl, formed of sheet metal and angle irons rivetted together and
consisting of a circular pipe carrying one or more hollow truncated cones and
terminating with a perfect hollow cone all as herein before specified and set forth in
this specification and illustrated by accompanying drawing.
Dated this 9-11- A 1000
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.