IMPROVEMENTS IN CHIMNEY TOPS, TERMINALS FOR VENTILATING SHAFTS & THE LIKE
Year: 1884

page_text: COMPLETE
SPECIFICATION.
I, THOMAS WHITEHEAD of 8, Nile Street in the city of Liverpool in the county
of Lancaster, Practical doctor of smoky chimneys, do hereby declare the nature
of the said invention for "IMPROVEMENTS IN CHIMNEY TOPS, TERMINALS FOR
VENTILATING SHAFTS & THE LIKE" and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following.
statement:-
This invention has for its primary object a chimney top that shall under any
wind give free emission of smoke and products of combustion, and yet shall not
impede the passage of the ordinary radial brush, and secondarily the adaptation of
the same invention as an exit ventilator.
The invention is best described by aid of the accompanying drawings in
which Fig. 1 is an elevation and Fig. 2 a horizontal section through the middle
of Fig. 1.
A A are wind guards which may be in the shape shown or curved, but must be
concave outward (Fig. 2), B B smaller wind guards protecting the apertures
between the wind guards A, A and which can be of any convenient shape; round
bars would do but are preferably convex inward and must protect the entrance
between A, A from a wind blowing direct to the centre of the chimney top or
ventilator.
Ca base plate which can be convex, concave, corrugated radially or flat. It
only extends to the junction with the shaft D and serves to carry the wind guards.
D shaft leading into the chimney or ventilating shaft. E radial guard plates
extending the entire depth of the wind guards. F cap to prevent the rain or other
matter falling into the chimney pot or ventilator.
The mode of action is as follows: Any wind that may enter any of the wind
apertures is guided right through, drawing the smoke with it, while the smoke
has also full opportunity of escaping out from the other apertures not exposed
directly to the wind.
Having now described particularly and ascertained the nature of my invention
and in what manner the same is to be performed, I would state that I do not
confine or bind myself to vertical chimney pots or ventilators, as my apparatus
could stand in other positions, nor to the exact details of the design hereunto
annexed, and on the other hand that I make no claim for curved or angular wind

page_text: guards broadly, nor yet for radial partitions of themselves, nor for any one part of
my apparatus taken separately, such as the cover, the base plate or the shaft-as
these are all old, but I declare that what I claim is :-
1st. The chimney top or ventilator in which the wind, baffling arrangement at the
points of exit consists of a series of wind guards concave outward having long slits
between them shielded. from a wind blowing in the direction of the central axis of
the chimney pot or ventilator by outer wind guards, substantially as described.
2nd. In combination with a series of wind guards concave outward and freely
exposed to the wind except at their edges, a series of radial partitions E guiding
what wind does enter directly across the ventilator, yet unimpeding, the action of
a brush substantially as described.