IMPROVEMENTS IN APPARATUS FOR INCREASING DRAUGHT AND PREVENTING DOWN DRAUGHT IN CHIMNEYS, AND FOR VENTILATING HOUSES, PUBLIC AND OTHER BUILDINGS, DRAINS, AND OTHER PLACES
Year: 1879

page_text: LETTERS PATENT to Thomas Janeway, of Kennington, in the County of Surrey,
for the Invention of "IMPROVEMENTS IN APPARATUS FOR INCREASING DRAUGHT
AND PREVENTING DOWN DRAUGHT IN CHIMNEYS, AND FOR VENTILATING
HOUSES, PUBLIC AND OTHER BUILDINGS, DRAINS, AND OTHER PLACES."
Sealed the 6th April 1880. and dated the 7th October 1879.
PROVISIONAL SPECIFICATION left by the said Thomas Janeway at the
Office of the Commissioners of Patents on the 7th October 1879.
THOMAS JANEWAY, of Kennington, in the County of Surrey. "IMPROVEMENTS
IN APPARATUS FOR INCREASING DRAUGHT AND PREVENTING DOWN DRAUGHT IN
CHIMNEYS, AND FOR VENTILATING HOUSES, PUBLIC AND OTHER BUILDINGS,
DRAINS, AND OTHER PLACES."
This Invention relates to improvements in apparatus to be applied to the tops of
chimneys to increase or create a draught thercin and to prevent a down draught,
serving also for ventilating houses, public and other buildings, drains, and other
places where ventilation is required.
The apparatus may be made of terra cotta, earthenware, zinc, or other suitable
metal or material, and is formed with an inner chamber or passage in the shape of
a truncated hollow cone, of which the base may be either circular, oval, or square,
with a trumpet shaped mouth superposed, and terminated by a conical cap inclined
upwards at an angle of 45 degrees or thereabout, with an orifice of the same circum-
ference as the neck of the cone. An additional conical cap may be applied above
the outlet if desired.
Two or more V shaped semi-cylindrical chambers are formed around and arranged
parallel with the inner conical chamber or passage, being separated from it by a
series of struts or otherwise and by side pieces extending along the inner edge of
the V.
A semi-circular opening is formed in the base of each of the V shaped cases for
the passage of air from the outer to the inner chambers. The air being carried
down the outer case or shell of the apparatus is compressed by the narrowing form
of the passage, and entering the inner chamber by the semi-circular openings is
ejected upwards with an increased force.
The force of the injected air increases in proportion to the enlargement of the
inlets for air, so that this improved apparatus can be applied for improving the
draught in chimneys for factories and other works where additional length of shaft
would otherwise be necessary.
In cases where low buildings adjoin high structures, and when applied as a means
of ventilating rooms, drains, or other places, the injector is fitted with an additional
conical cap to exclude rain.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
"
the said Thomas Janeway in the Great Seal Patent Office on the 7th April 1880.
THOMAS JANEWAY, of Kennington, in the County of Surrey. IMPROVEMENTS
IN APPARATUS FOR INCREASING DRAUGHT AND PREVENTING DOWN DRAUGHT IN
CHIMNEYS, AND FOR VENTILATING HOUSES, PUBLIC AND OTHER BUILDINGS, DRAINS,
AND OTHER PLACES."
This Invention relates to improvements in apparatus to be applied to the tops of
chimneys to increase or create a draught therein and to prevent a down draught,
serving also for ventilating houses, public and other buildings, drains, and other
places where ventilation is required.
The apparatus may be made of terra cotta, earthenware, zinc, or other suitable
metal or material, as represented in Figures 1 and 2 of the Drawings hereto annexed,
being formed with an inner chamber or passage a in the shape of a truncated hollow
cone, of which the base may be either circular, oval, or square, with a conical or
trumpet shaped mouth a¹ superposed, and terminated by a conical cap b inclined
upwards at an angle of 45 degrees or thereabout, with an orifice of the same circum-
ference as the neck of the cone a'. An additional conical or other shaped cap c may
be applied above the outlet if desired.
Two or more V shaped semi-cylindrical chambers a² are formed around and
arranged parallel with the inner conical chamber or passage a, being separated from
it by a series of struts a³ or otherwise, and by side pieces extending along the inner
edge of the V.
A semi-circular opening d is formed in the base of each of the V shaped cases or
passages a² for the passage of air from the outer to the inner chambers. The air
being carried down the outer case or shell of the apparatus is compressed by the
narrowing form of the passages a², and entering the inner chamber « by the semi-
circular openings d is ejected upwards with an increased force. Openings e are
made in the passage a, communicating with curved tubes or passages on the interior
of the passage a, by which currents of air are conducted around the inner surface of
the passage a so as to increase the upward draught.
The force of the injected air increases in proportion to the enlargement of the
inlets d for air, so that this improved apparatus can be applied for improving the
draught in chimneys for factories and other works where additional length of shaft
would otherwise be necessary.
In cases where low buildings adjoin high structures, and when applied as a means
of ventilating rooms, drains, or other places the injector is fitted with the additional
conical cap c to exclude rain.
Having thus described the nature of my Invention, and the manner of performing
or carrying the same into practice, what I claim is,-
The improved arrangement, combination, and construction of chimney pots or
apparatus formed with conical air passages a², d, e, and caps b and c for increasing
draught and preventing downdraught in chimneys, which also acts so as to ventilate
houses, buildings, drains, and other places, substantially as and for the purposes
herein before described and represented in the Drawings hereto annexed.
In witness whereof, I, the said Thomas Janeway, have hereunto set my hand
and seal, this Seventh day of April, in the year of our Lord One thousand
eight hundred and eighty.