MENTS IN TALLBOYS FOR PREVENTING 'DOWN' DRAUGHTS
Year: 1884

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I FREDERICK WILLIAM SMITH of N° 5 Chancery Lane in the County of
'IMPROVE-
Middlesex do hereby declare the nature of the said Invention for
MENTS IN TALLBOYS FOR PREVENTING 'DOWN' DRAUGHTS to be as follows:-
This Invention has relation to machinery or apparatus for the prevention of
'down' draughts in chimneys. or flues, and my improvements consist in applying:
an extra chimney or flue composed of metal and constructed as follows:--
In the first place I employ a slightly conical tube which is widest at the bottom.
Outside this, is a conical shell, the upper and widest rim of which is on a level .
with the upper rim of the first mentioned tube. Midway between the two tubes
is a third conical tube of which the lowest and widest rim is slightly below the
upper rim of the two tubes already mentioned, and this is enclosed at the top
within a fourth hollow cone expanding in the opposite direction and within which
is a fifth cone contracting towards the top. In the interior of the last hollow cone
is a float, fixed to a vertical sliding rod, and this float is in the form of a double
cone and serves to maintain the equilibrium between the up and down draughts.
Dated this 22nd day of January 1884.
HUGHES & SON;
5, Chancery Lane, W.C.

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I, FREDERICK WILLIAM SMITH, of 5 Chancery Lane, in the County of Middlesex,
do hereby declare the nature of the said Invention for "IMPROVEMENTS JN
'TALL-BOYS' FOR PREVENTING DOWN-DRAUGHTS 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 relation to machinery or apparatus for the prevention of
down draughts in chimneys or flues, and my Improvements consist in applying an
extra chimney or flue composed of metal and constructed as follows:-
In the first place I employ a tube of suitable length and diameter, and above
this I fix a hollow truncated cone, the lower and wider end of which dips slightly
below the top of the tube. Above this is fixed a second hollow cone, the wider
end of which dips below the top of the first cone. The two portions of the
apparatus where the cones overlap, are protected by wind guards composed of
similar hollow. cones inverted, that is to say, the upper ends are widest.
.In the interior of the top cone is a float fixed to a vertical sliding rod, and this
float is in the form of two cones joined together at their bases. The object of the
float is to protect the orifice or mouth of the second cone.
And in order that my Invention may be more fully understood, I herein give
reference to the accompanying drawing which represents a sectional view of my
apparatus.
A is a metal chimney or flue which is fixed on the top of the ordinary chimney
or stack. B. C. D and E are hollow truncated cones secured about one another by
ribs or stays a. To the top of the cone E is attached a bridge or strap F supporting
a hollow tube through which passes the rod b to the bottom of which is fixed the
hollow float G.
The arrows shew the direction of the opposing currents, the upward current
being confined to the interior of the apparatus, and any downward current being
deflicted towards the sides of the cones by the float, passes out in the direction of
the curved arrows.
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
1. The combination of a series of hollow truncated cones arranged substantially
as and for the purpose herein shewn and described.
2. The use of the float G placed in the interior of the upper cone, as and for the
purpose herein shewn and described.
Dated this 21st day of October 1884.