Chimneys and Preventing its Return down the snait.
Year: 1886

page_text: Date of Application, 7th May, 1886.
Complete Left, 7th Mar., 1887.
Complete Accepted, 7th Apr., 1887
Chimneys and Preventing its Return down the snait.
JOHN BIDEN FRYER Clint House Queen's Road Buckhurst Hill County of Essex,
Captain in the Mercantile Navy do hereby declare the nature of this invention to be
as follows:-
:-
The Cowl consists of a circular revolving head placed on the top of the smoke shaft.
This head is composed of an inner lining with an outer cover or jacket. The inner
lining forms three parts or thereabouts of a circle with a free aperture hereinafter
called the exit on the one side. On each side of this inner lining is placed an outer
jacket with an aperture corresponding with the exit, and a second and similar aperture,
hereinafter called the mouth on the opposite side of the circle. The two skins are
fixed together wind tight at top and bottom, with an intervening space of two or
three inches or thereabouts, a vane being placed on the top cover so as to keep the
mouth to the wind, both mouth and exit being provided with suitable side guards or
jaws. The Cowl being placed so as to revolve freely on the top of the smoke shaft, is
kept in position by the vane, and the wind entering at the mouth blows through the
intervening space between the outer and inner linings and escapes at the exit. The
current thus created, causes an updraught in the chimney and the smoke is carried
freely out from the smoke shaft through the exit.

page_text: Chimneys and Preventing its Return down the Shaft.
I JOHN BIDEN FRYER, Clint House, Queens Road, Buckhurst Hill, county of Essex,
Captain in the Mercantile Navy, do hereby declare thenature 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:-
The object of this invention is an improved cowl or chimney top applicable also for
sewer and general ventilation purposes.
The cowl consists of a circular revolving bead placed on the top of the smoke shaft.
This head is composed of an inner lining with an outer cover or jacket. The inner
lining forms three parts or thereabouts of a circle, with à free aperture, hereinafter
called an exit on one side. On each side of this inner lining is placed, an outer jacket,
with an aperture corresponding with the exit, and a second and similar aperture,
hereinafter called the mouth, on the opposite side of the circle.
The two skins are fixed together wind tight at top and bottom with an intervening
space of two or three inches or thereabouts, a vane being placed on the top cover so
as to keep the mouth to the wind, both mouth and exit being provided with suitable
side guards or jaws.
The cowl being placed so as to revolve freely on the top of the smoke shaft is kept
in position by the vane, and the wind entering at the mouth, blows through the
intervening space between the outer and inner linings, and escapes at the exit.
The current thus created causes an updraught in the chimney and the smoke is
carried freely out from the smoke shaft through the exit.
The manner of carrying this invention into effect will be understood by reference
to the annexed drawings in which Figure 1 is an elevation, Figure 2 a vertical section
and Figure 3 a cross section of my improved cowl.
The circular revolving head is composed of an inner lining b with a jacket c. The
top cover d carries a vane e and receives the spindle, said spindle being fixed to a
bridge piece g with side bars g', g¹ to prevent accumulation of soot in the cowl. This
bridge piece is on the smoke shaft h.
Friction between the bridge piece g and the cover d is prevented by the use of a
bearing i attached to the top cover. j, j, are the guards or jaws of the mouth of the
cowl, and k, k, those of the exit.

page_text: The direction in which the wind passes through the cowl is indicated by the arrows
in full lines, a vacuum being created by the through rush of air sucking up the smoke,
so that the smoke is drawn up the chimney and shaft, and issues as indicated by the
dotted arrows.
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 :-
-
The cowl shown in the annexed drawings and so arranged that air can enter the
mouth and pass round between the jacket c and the lining b as and for the purposes
described.