Smoke Preventing Chimney Pot and Draught Inducer.
Year: 1894

page_text: Date of Application, 25th Apr., 1894
Complete Specification Left, 23rd Jan.. 1895-Accepted, 23rd Mar.. 1895
PROVISIONAL SPECIFICATION.
Smoke Preventing Chimney Pot and Draught Inducer.
HUGH GARRATT FOSTER BARHAN, 28 Salmon Parade Bridgwater Somerset,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
-
My invention relates to improvements in chimney pots, and in shafts or pipes
used for ventilation purposes, & is designed not only to prevent any down draught
which would check the proper action of the chimney, shaft, or pipe, but also to
induce a current of air to pass up the chimney, shaft, or pipe, & thus aid the
purpose for which they are constructed.
I accomplish this by causing the air to draw upwards through the chimney put,
shaft, or pipe in the following manner which I will describe as applied to
chimney pots.
The bottom of the chimney pot is constructed with an inner case or cylinder
extending about one half up the chimney pct. On the periphery of the chimney
pot which thus acts as an outer case, & near its base I make air holes through
which the air passes, and is conducted into the chimney pot by means of spiral
passages between the inner and outer case.
The number of holes and passages will depend on the circumference of the
chimney pot.
The tops of the spiral passages are contracted or choked thus causing an increased
velocity in the draught of air through them, and the draught so created induces a
current of air to pass up the chimney.
Dated this 24th day of A nril 1894
H. G. F. BARHAM.
HUGH GARRATT FOSTER BARHAM Bridgwater, Somerset, Civil Engineer, do
hereby declare the nature of this invention and in what manuer the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to improvements in chimney pots, and in shafts or pipes
used for ventilating purposes, and is designed not only to prevent any down draught
which would check the proper action of the chimney, shaft, or pipe, but also to
induce a current of air to pass up the chimney, shaft or pipe, and thus aid the
purpose for which they are constructed.
I accomplish this by causing the air to draw upwards through the chimney pot,
shaft, or pipe in the following manner which will describe as applied to
chimney pots.
The bottom of the chimney pot is constructed with an inner case, or cylinder,
extending about one half up the chimney pot. On the periphery of the chimney
pot which thus acts as an outer case, and near its base, I make air holes through
which air passes, and is conducted into the chimney pot by means of spiral passages
between the inner and outer case.

page_text: The number of holes, and passages will depend on the circumference of the
chimney pot. The tops of the spiral passages are contracted, or choked, thus
causing an increased velocity in the draught of air through them, and the draught
80 created induces a current of air to pass up the chimney.
The drawing here appended shows a half section, and elevation of such a chimney
pot fitted with four holes.
The spiral veins on the inner case fit close against the outer case.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of an outer case with air holes, and an inner case with veins
upon it, which cause the air to pass upwards between the inner, and outer case.
2: The projection at the top of the inner case upon its outside diameter, which
has the effect of throttling the draught at this point.
Dated this 19th day of January 1895.
H. G. F. BARHAM.