IMPROVEMENTS IN CHIMNEY POTS OR APPARATUS FOR FACILI- TATING DRAUGHT IN CHIMNEYS WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO FACILITATE VENTILATION
Year: 1883

page_text: LETTERS PATENT to Frederic Hammond of N° 2 Coleman Street Buildings
Moorgate Street in the City of London Architect and Surveyor for an
Invention of IMPROVEMENTS IN CHIMNEY POTS OR APPARATUS FOR FACILI-
TATING DRAUGHT IN CHIMNEYS WHICH IMPROVEMENTS ARE ALSO APPLICABLE
TO FACILITATE VENTILATION
PROVISIONAL SPECIFICATION left by the said Frederic Hammond at the
Office of the Commissioners of Patents on the 23rd February 1883.
FREDERIC HAMMOND of N° 2 Coleman Street Buildings Moorgate Street in the
City of London Architect and Surveyor IMPROVEMENTS IN CHIMNEY POTS OR
APPARATUS FOR FACILITATING DRAUGHT IN CHIMNEYS WHICH IMPROVEMENTS ARE
ALSO APPLICABLE TO FACILITATE VENTILATION
The object of the invention is to secure an upward draught in Chimneys and to
avoid a down draught
For this purpose I form the pot or outlet for the smoke and products of combustion
with a cap or upper portion which may be fixed together or the parts may be
separable
The upper portion of this cap is of about the same dimensions as the main body
of the pot or outlet but this cap or upper portion is enlarged progressively down-
wards so as to leave space between its lower edge and the exterior of the lower
portion of the pot or outlet for the free passage of air to act upon the smoke and
products of combustion to facilitate upward draught as well as to prevent a down
draught
The cap or upper portion rests on projections from the lower portion with ribs or
other suitable parts to preserve their correct relation.
I form these pots and their Caps by preference of glazed stone ware
Pots or outlets thus formed are also applicable otherwise to facilitate ventilation.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frederic Hammond in the Great Seal Patent Office on the
21st August 1883.
FREDERIC HAMMOND of N° 2 Coleman Street Buildings Moorgate Street in the
City of London Architect and Surveyor "IMPROVEMENTS IN CHIMNEY POTS OR
APPARATUS FOR FACILITATING DRAUGHT IN CHIMNEYS WHICH IMPROVEMENTS ARE
ALSO APPLICABLE TO FACILITATE VENTILATION"
The object of the invention is to secure an upward draught in chimneys and to
avoid a down draught.
For this purpose I form the pot or outlet for the smoke and products of com-
bustion with a cap or upper portion which may be fixed together or the parts may
be separable.
The upper portion of this cap is of about the same dimensions as the main body
of the pot or outlet but this cap or upper portion is enlarged progressively down-
wards so as to leave space between its lower edge and the exterior of the lower
portion of the pot or outlet for the free passage of air to act upon the smoke and
products of combustion to facilitate upward draught as well as to prevent a down
draught. The cap or upper portion rests on projections from the lower portion with
ribs or other suitable parts to preserve their correct relation...
I form these pots and their caps by preference of glazed stone ware but they may
be made of metal or other suitable material.
Pots or outlets thus formed are also applicable otherwise to facilitate ventilation.
But that the invention may be the better understood I will by the aid of the
accompanying Drawings proceed more fully to describe means pursued by me in
carrying the same into effect.
Figure 1 shews an external view of a chimney pot arranged according to my
invention. Figures 2 and 3 represent by sectional views the parts of Figure
separately. Figure 4 represents a plan view looking downwards on the part
Figure 3.
In each of the views the same letters indicate corresponding parts and it will be
seen that the pot is formed in two parts, the lower portion a and the upper portion
or cap b. The internal diameter of the upper portion b¹ of this cap bis of about
the same dimension as the internal diameter of the main body or outlet a¹ of the
pot a but this cap or upper port on is enlarged progressively downwards to about
the part 6 so as when applied over the upper portion of the part a to leave space
between the part 62 and the exterior of the part a' for the free passage of air to act
upon the smoke and products of combustion to facilitate upward draught as well as
to prevent a down draught.
The cap or upper portion b rests on projections a² from the part a and there are
ribs or suitable parts a³ to aid in maintaining the correct relations between the
upper portion of the part a and the lower portion of the part b.
Although I have indicated dimensions of the parts on the drawings, those
dimensions simply indicate dimensions such as I have found to answer but I do
not wish to limit myself to any such dimensions or relations as the same may be
varied.
It will also be readily understood that apparatus arranged as shown and described
is applicable generally to facilitate ventilation.

page_text: Having thus described my invention and means which I adopt to carry the same.
into effect I would have it understood that what I claim is the arranging or
combining parts of chimney pots or apparatus for facilitating draught in chimneys
and to facilitate ventilation as described.
In witness whereof I the said Frederic Hammond have hereunto set my hand
and seal this twentieth day of August One thousand eight hundred and eighty
three.
FREDERIO HAMMOND (LS)