IMPROVEMENTS IN CHIMNEY TOPS AND. EXIT VENTILATORS
Year: 1884

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COMPLETE SPECIFICATION.
I CHARLES DOLIN, Zincworker of 15 Millbrooke Road, Brixton in the County
of Surrey, do hereby declare the nature of the said Invention for IMPROVEMENTS
IN CHIMNEY TOPS AND. EXIT VENTILATORS and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
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This Invention consists of a central tube, plugged at the top; with a conical
shaped cone, cover, or lid, placed point downwards, to prevent the smoke passing
out at the top, this tube to be fixed on the top of the chimney pot, and in the tube
are cut, slots or openings in four equal divisions perpendicular in the tubes
circumference. On the outside of the central tube is covered with eight external
semi-circular or other shaped cylinders, as shewn in the accompanying Drawings,
four of the cylinders being double lined, are placed over the four perpendicular
slots, with a small hole top and bottom of these cylinders, & connected with the
remaining four cylinders of shape as shewn in accompanying Drawings these
being entirely open top and bottom. Thus when the smoke passes up the central
or internal tube, and travels through each of the four perpendicular slots, into the
inner lining of the double lined external semi-circular cylinders that are partially
closed at top and bottom, thence by an opening being cut at the sides of the inner
to the outer lining of the double cylinder, to allow the free passage of the smoke
to travel into the adjacent external cylinder of shape as shewn in the accompanying
Drawings which is open top and bottom and thus the smoke passes away. My
Invention is applicable to chimney tops and ventilation shafts and pipes, or
wherever it may be desirable to induce an outward current of air and to check
down draught. Any wind striking downward through the partially openings of
the double lined external semi-circular cylinders is deflected therefrom through the
opening into the adjacent cylinder and aids the induced draught. And in order
that my Invention may be better understood I now proceed to describe the
Drawings. Figure I is a section of my device.
Figure II is a plan representing the interior arrangements.
Figure III is the elevation of the chimney top.
Figure IV is the plan of top of apparatus.
Like letters refer to like parts in each Figure.

page_text: four slots cut perpendicular where the smoke escapes into the double lined semi-
circular cylinder D. D is the four double lined semi-circular cylinders placed over
the four slots marked A. E is the adjacent cylinder of shape as shewn in
accompanying Drawings where the smoke escapes both top and bottom. F is the
draught holes of the four cylinders D deflecting therefrom through the openings
into the adjacent cylinders marked E. C is the V guard fixed to the central tube.
Having now particularly described the nature of my said Invention, and in
what manner the same is to be performed, I declare that what I claim is:
1. The arrangement and combination of the outer cylinders, open at the ends,
with the double-lined semi-circular cylinders fixed on the central tube, substantially
in the manner herein described and illustrated in the accompanying Drawings.
2. The arrangement and combination of the perpendicular slots in the central
tube, the double-lined semicircular cylinders, the V guards fixed to the central tube,
substantially in the manner herein described and illustrated in the accompanying
Drawings.
3. The method of, and apparatus for protecting the top of the central tube for
preventing down-draught substantially in the manner described and illustrated in
the accompanying Drawings.
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