An Improved Construction of Chimney Top to Induce Up Draught.
Year: 1887

page_text: Date of Application, 19th Dec., 1887
Specification Accepted, 20th Jan., 1888
RESERVE
An Improved Construction of Chimney Top to Induce Up
Draught.
We, JOHN HORNE, of Hallam Hall, Clevedon, Gentleman, and SAMUEL HOLLYMAN,
of Culmstock Cottage, Clevedon, in the county of Somerset, Plumber and Decorator
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:-
This invention relates to a novel construction of chimney top which may form part
of a pot proper or attachable to an ordinary pot, the object being to induce an up-
draught in a sluggish chimney with a free passage for smoke through the top which
also facilitates cleaning when necessary.
At Figure 1 of the annexed drawings, we show an ordinary pot A with our
improved top B affixed thereto by simply dropping it inside the pot A. This top B
is of bulbous form and provided with apertures C at its lower part and having within
it a deflecting or baffle plate D substantially as seen by the sectional view Figure 2
for the air which passes through the apertures C to strike against and then to pass up
over the baffle D into the body of the bulb, the air licking against a shell portion E
and forming a suction up the pot or tube A from whence they i.e. the air and the
smoke pass up the connection F and straight up and out of the capping G or through
the side channels H as indicated by the arrows.
If the top be placed where wind eddy's are prevalent to prevent down draught
we suspend a perforated disc I to deflect the air blowing down the cap G into the
lower part of the bulb where it will escape through the aperture C still inducing an
updraught in the pot A by the direction which the down draught wind has
to take.
Figure 3 is a sectional elevation of the top shown at Figure 2, of metal,
such as zine or sheet iron but according to Figure 1 it is made of the usual pot
ware.
If we make the pot A and the top B wholly of metal it has a foot plate J as seen
at Figure 4.
The pot A may be surrounded with an outer shell K as seen at Figure 5 having

page_text: holes at the lower part for conveying atmospheric air up the channel between the
pot A and the outside casing K, the pot A being somewhat narrowed at the upper
part L to contract the outlet for strengthening the updraught into the bulb B
from whence it passes through the connection F and cover G or through side
channels H.
The outer casing K in a measure breaks up the direct action of wind against the
pot A so that the air in the pot A is kept rarified from the natural warmth passing
from a room, upon the chimney of which such a pot is fixed.
The chimney top hereinbefore described is strictly scientific both in its character
and its action.
Its bulb preserves in a remarkable manner the temperature of the chimney and
room to which the pot is applied. When a fire is burning this bulb is a gasometer
of heated gases; and when a fire is not burning it is still a globe of air warmner than
that of the external atmosphere; thus ventilating always. The slightest experiment,
say a piece of lighted paper placed at the bottom of the shaft inside, will prove this.
This globe of heated air is not only supported by the ascending current of shaft
and chimney but is further assisted to discharge itself by a powerful inrush of air
through the perforations, the current of colder air, however, being diverted by the
baffle flange of the interior pot so as not to contract unduly the globular space while
increasing the upward current already made. These two currents are next pressed
and contracted by the upper portion of the bulb and the connection and shield G thus
forming a perfect security against the down-currents of whirling storms and winds
rebounding from loftier heights. The most adverse action of such winds tends simply
to compress the air in the globe which escapes through the perforations as its easier
course, or otherwise helps the smoke still more quickly to pass from under the shield.
The advantages are ;-
1. It entirely prevents down-draughts.
2. It gives freedom to smoke by every action of the wind.
3. It is noiseless, easily swept, and cannot get out of order.
4. It practically lengthens the chimneys of attics, ventilates every bedroom day
and night, prevents the gases of one flue from descending another flue, and quickens
the most sluggish of fires.
5. It tends to make and keep chimneys clean, wholesome, and of the highest
service and comfort.
6. It is handsome in appearance, lending itself to the exigencies of the architect
and builder.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The construction and arrangement of chimney top as hereinbefore described and as
shown in the annexed drawings either as a top affixable to an ordinary chimney pot or
provided with a pot as part of same as set forth.
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H. GARDNER,
166, Fleet Street, London,
Agent for the said J. Horne and S. Hollyman.