IMPROVEMENTS IN CHIMNEY COWLS AND VENTILATORS
Year: 1884

page_text: I, THOMAS BROWN, of Penicuik, in the county of Midlothian, Plumber, do hereby
declare the nature of my said Invention for "IMPROVEMENTS IN CHIMNEY COWLS
AND VENTILATORS," to be as follows:-
This Invention relates to improvements in chimney cowls and ventilators, and
it consists mainly in forming tubular conduits round the body of the cowl or
ventilator to induce, by the action of the air flowing through them, upward
currents in the chimney or shaft to which the cowl or ventilator is attached.
The improved cowl or ventilator is made of any of the usual forms, for example,
with a cylindrical or tubular body terminating in a cone at the top, the part of the
body in which the smoke or air outlets are formed being of greater diameter than
the lower part. At intervals round the lower part of the body are formed or fitted
a number of vertical tubes or conduits, which are open at the lower end and
terminate at the upper end within the expanded part of the body. These tubes
carry air upwards into the body of the cowl or ventilator at or near the level of
the outlets, and the currents of air passing up through them induce a continuous
up-current through the cowl or ventilator, which prevents blow-downs or down-
draughts. The guards which are usually fitted round the outlets to protect them
from the action of the wind are curved alternately inwards and outwards at their
edges, so that the air which blows through the guards may induce an outward flow
of the smoke or foul air, while direct access of the wind to the outlets is prevented.
The top cone is made in the form of a cover, or is fitted with a cap which can be
conveniently removed and replaced, the cap being secured by a chain. In the case
of a chimney cowl, the movable cap is advantageously applied as it gives access to
the chimney for cleaning.

page_text: I, THOMAS BROWN, of Penicuik, in the county of Midlothian, Plumber, do hereby
declare the nature of my said Invention for "IMPROVEMENTS IN CHIMNEY.COWLS
AND VENTILATORS," 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 improvements in chimney cowls and ventilators, and
it consists mainly in forming tubular conduits round the body of the cowl or
ventilator to induce, by the action of the air flowing through them, upward
currents in the chimney or shaft to which the cowl or ventilator is attached.
In the accompanying drawings which illustrate my invention Figure 1 is an
elevation, Figure 2 is a vertical section, and Figure 3 is a horizontal section of
a modification of my improved ventilator, Figure 4 is a vertical section of a
modification adapted to suit as a chimney cowl.
The improved cowl or ventilator is made of any of the usual forms, for example,
with a cylindrical or tubular body A torminating in a cone at the top, the part of
the body in which the smoke or air outlets are formed being of greater diameter
than the lower part. At intervals round the lower part of the body are formed
or fitted a number of vertical tubes or conduits B, which are open at the lower end
and terminate at the upper end within the expanded part of the body. These
tubes B carry air upwards into the body of the cowl or ventilator at or near the
level of the outlets C, and the currents of air passing up through them induce a
continuous up-current through the cowl or ventilator, which prevents blow-downs
or down-draughts. The inner and outer guards D D' which are usually fitted round
the outlets C to protect them from the action of the wind are curved the one set
inwards and the other outwards at their edges à d¹, so that the air which blows
through the guards may induce an outward flow of the smoke or foul air, while
direct access of the wind to the outlets is prevented. The top cone is in some cases
made in the form of a cover or is fitted with a cap E which can be conveniently
removed and replaced, the cap being secured by a chain. In the case of a chimney
cowl, the movable cap E is advantageously applied as it gives access to the
chimney for cleaning.
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 improved construction of chimney cowls and ventilators berein described
and illustrated.
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