An Improved Chimney Cowl.
Year: 1894

page_text: Date of Application, 2nd June, 1894
Complete Specification Left, 4th Mar., 1895-Accepted, 6th Apr.,
1895
PROVISIONAL SPECIFICATION.
An Improved Chimney Cowl.
I, WILLIAM CRASTER MOWBRAY, of 88 Evelyn Street, Deptford, London S.E.,
Coach and Van Builder, do hereby declare the nature of my said invention to
be as follows:-
The object of my invention is to construct improved cowls for chimnies and
flues, whereby the action of the wind in any direction is rendered accessory to the
eduction of the smoke and other volatile products of combustion.
My invention consists of the ordinary terminal, attached to the flue in any
convenient manner. Above this terminal, and attached thereto by suitable means,
I fit two frustums of cones, one above the other, both being open to the external
air below, and providing shielded openings into the flue. The cowl is finished
above with an inverted frustum of a coue, (of a bell shape) having an outwardly
turned flange all round.
The cowl may be made in one with the chimney pot or terminal and circular,
square, or polygonal, so as to adapt it to the form of the flue to which it may be
fitted.
The action of the wind on any side is such that the lower conical surfaces receive
its force and throw it upwards, thus inducing upward currents, both internally and
externally, and such currents, together with the smoke, are carried away from
the top.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
An Improved Chimney Cowl.
I, WILLIAM CRASTER MOWBRAY, of 88 Evelyn Street, Deptford, London S.E.,
Coach and Van Builder, do hereby declare the nature of my said invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
The object of my invention is to construct improved cowls for chimnies and
Blues, whereby the action of the wind in any direction is rendered accessory to the
eduction of the smoke and other volatile products of combustion.
My invention consists of the ordinary terminal, attached to the flue in any
convenient manner. Above this terminal, and attached thereto by suitable means,
I fit two frustums of cones, one above the other, open to the external air below,
and providing a shielded opening into the flue on all sides. The cowl is finished
above with an inverted frustum of a cone, modified to a bell shaped top, with an
outwardly turned flange all round.
The cowl may be made in one with the chimney pot or terminal (if preferred)
and its sectional form may be circular, square, elliptical, or polygoual, so as to
adapt it to the form of the flue to which it may be fitted.

page_text: The action of the wind on any side is such that the lower conical surfaces
receive its force and throw it upwards, thus inducing upward currents, both
internally and externally; and such currents, together with the smoke, are carried
away from the top.
And in order that my said invention may be particularly described and ascer-
tained, reference is hereby made to the accompanying drawing, being an elevation,
partly in section, illustrating my invention, as applied to an ordinary chimney.
a is the lower end of the cowl, which is fitted to the chimney terminal in the
usual manner. bis a frustum of a cone attached to a. e is a second frustum of a
cone and d is an inverted frustum of a cone, which may be made in one with e, as
shown, or in two parts and united at their smallest diameters. The upper end
of d is flanged outwardly at e, as shown.
In a horizontal wind the conical surfaces induce an upward current of air
between the cones b and c, and the bell-mouthed top of d induces a partial vacuum
above the cowl; and, in case of a downdraught, the smoke and air escape out-
wardly between b and c. My improved cowl also effects a great reduction in the
deposit of soot in the flue.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved chimney cowl, substantially as and for the purposes described.
2. In a chimney cowl the combination of a terminal a, and three conoids or
conoidal structures b c and d arranged and operating, substantially as hereinbefore
described and illustrated by the drawings.
Dated 1st March 1895.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.