A Chimney Top for Effectually Preventing Down-draught in 1. Chimneys and Remedying Smoky Chimneys, Applicable. also, to Ventilating Purposes.
Year: 1889

page_text: Date of Application; 30th May, 1889
Complete Specification Left. 22nd Feb. 1890-Accepted, 3rd May, 1890
1.
PROVISIONAL SPECIFICATION...
Jo
A Chimney Top for Effectually Preventing Down-draught in
1. Chimneys and Remedying Smoky Chimneys, Applicable. also, to
Ventilating Purposes....
I; JOHN JAMES DOWNES of 11 The Parade Lewisham High Road, S.E.
Architect & Surveyor, do hereby declare the nature of this. invention to. be; as
follows:-
A chimney top.constructed in terra-cotta, and in iron galvanized. or painted, the
base to, have a flange to stand on brickwork of the chimney and to be built in, the
diameter of the base to be 12 inches and contracted at a height of 3 feet, to 8 inches.
in diameter, above this is fixed louvres sloping outwards in 3, 4, 5, & 6 or more tiers
to suit the different positions of the chimney. Above these louvres is fixed a cone
9 inches in diameter at the base and 2 ft. 6 ins. in height and contracted at the
top to 7 ins. in diameter, the height and other dimensions to be regulated according
to the position of the chimney; each part to be securely connected together.
'It is also intended to make the chimney top without the flange at the base and of
dimensions to fit into existing tops.
This design to be applied as a ventilator for soil pipes, and, as exhaust ventilators
to public buildings and private dwellings in these cases a cap will be fixed on the top
of same.
I claim for this Invention:
1. An effectual, remedy-for-smokey. chimneys in any position.
2.—A prevention of down draught, and increasing the up draught.
---
Dated this 30th day of May 1889.
COMPLETE SPECIFICATION.
A Chimney Top for Effectually Preventing Down-draught in
Chimneys and Remedying Smoky Chimneys, Applicable also to
Ventilating Purposes.
I, JOHN JAS. DOWNES, of 11 The Parade Lewisham High Road S.E. Architect &
Surveyor 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 :-
A chimney top constructed in terra cotta, in iron (galvanized or painted) and in
zinc. The base to have a flange to stand on the brickwork of the chimney and to be
built in. The proposed dimensions to be as follows, (but to be chiefly regulated by
the position of the chimney) the diameter at the base 12 inches, and contracted at a
height of 3 feet, to 8 inches in diameter; above this is fixed louvres sloping outward,
in 3, 4, 5, 6 or more tiers to suit the different positions of the chimney above these
louvres is fixed a cone 9 inches in diameter at the base, and 2 feet in height and
contracted at the top to 7 inches in diameter, each part to be securely connected
together.
It is also intended to make this chimney top without the flange at the base, and in
separate parts, and of dimensions, so as to fit into existing chimney tops or pots, as
shewn on the accompanying drawing as follows.

page_text: Fig. 1. represents the chimney top for building into the brickwork, A. being the
tapering shaft, B. the louvres. Fig. 2. the section of Fig. 1. Fig. 3. the part for
fixing into existing plain chimney pots and Fig. 4. for fixing into existing louvre
chimney pots, C being the straps to secure same.
In further explanation of the drawing it will be seen that one of the chief merits
of this invention is that the force of the down blow entering at E is considerably
reduced by the opening at D being wider than E in a similar manner the upward
draught is increased by the neck of the shaft at G being smaller than the base H
which is also helped by the current of air at the louvres.
"
This invention is also to be applied to ventilate soil pipes, and as exhaust veltilators
to public buildings and private dwellings, in these cases a cap may be necessary on
the top of same.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
1.-An effectual remedy for smoky chimneys in any position.
2. A preventative of down draught and increasing the up draught.
3. Its simplicity of construction having no movable parts it cannot get out of
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5. Economical in cost and easily fixed.
Dated this 22nd day of February 1890.
JOHN JAS. DOWNES,
11, The Parade, Lewisham High Road, S.E.