IMPROVEMENTS IN ANDIN THE INDIGING AD A COULERATING OF AN DUSTIVARD DRAUGHT PROVISIONAL SPECIFICATION
Year: 1881

page_text: LETTERS PATENT to John Gilmore, of Lower Norwood, in the County of
Surrey, Clerk in Holy Orders, and William Richard Clark, of Peckham, in
the County of Surrey, Mechanician, for an 'Invention of "IMPROVEMENTS IN
ANDIN
THE INDIGING AD A COULERATING OF AN DUSTIVARD DRAUGHT
PROVISIONAL SPECIFICATION left by the said John Gilmore and William
Richard Clark at the Office of the Commissioners of Patents on the 13th
July 1881.
JOHN GILMORE, of Lower Norwood, in the County of Surrey, Clerk in Holy
Orders, and WILLIAM RICHARD CLARK, of Peckham, in the County of Surrey,
Mechanician. "IMPROVEMENTS IN APPARATUS FOR THE INDUCING OR ACCELE-
RATING OF AN OUTWARD DRAUGHT FROM CHIMNEYS, VENTILATORS, AND SIMILAR
SHAFTS OR PIPES."
Our Invention relates to an apparatus applicable to chimney tops and ventilation
shafts and pipes, or wherever it may be desirable to induce an outward current of
air and to check indraught or downdraught.
Our Invention consists in the combination together of two or more rings in an
axial line, and with an interval between each ring.
These rings are tapered-from the inner periphery outwards so as to form a
conical section, if cut radially through the bottom or top rings of the series may be
semi-conical, and these tapering faces may be either plain or radially corrugated,
tapering at an angle of greater or less extent.
The object of this formation is to form the intervals into circular wide mouthed
apertures narrowing towards the centre, or where the corrugations are employed
a series of apertures narrowing to the centre.
The result obtained is that from whatever direction the wind may come it blows
through a narrowing passage or passages, and is thus increased in velocity when

page_text: striking across the mouth of the chimney top or ventilating shaft, and thereby
caused to induce a strong up or outward draft from the same. Any wind striking
downward upon the tapered faces of the rings is deflected therefrom more or less
in a horizontal direction, and aids the induced draught.
The top of the series may be conveniently formed into a conical cap on the
upper side, while the ring inside the taper may be fitted with a slightly domed
plate.
The lowest of the series may be formed in any manner convenient to fit in the
chimney or ventilating shaft to which it is to be applied.
The series may be held in suitable position by nuts upon bars passing through
the rings, so that when stored in quantity they may lie Hat upon one another, and
further admit of regulation of the size of the intervals, or the whole apparatus may
be made rigid.
Our apparatus may be used at any angle or inclination, vertical, horizontal, or
otherwise, and may be constructed of any suitable material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Gilmore and William Richard Clark in the Great Seal
Patent Office on the 12th January 1882.
JOHN GILMORE, of Lower Norwood, in the County of Surrey, Clerk in Holy
Orders, and WILLIAM RICHARD CLARK, of Peckham, in the County of Surrey,
Mechanician: "IMPROVEMENTS IN APPARATUS FOR THE INDUCING OR ACCELE-
RATING OF AN OUTWARD DRAUGHT FROM CHIMNEYS, VENTILATORS, AND SIMILAR
SHAFTS OR PIPES."
Our Invention relates to an apparatus applicable to chimney tops and ventilation
shafts and pipes, or wherever it may be desirable to induce or accelerate an
outward current of air from whatever direction, and to check indraught or down
draught.
Our Invention consists in the combination together of two or more rings in an
axial line, and with an interval between each ring.
These rings are tapered from the inner periphery outwards so as to form a conical
section if cut radially, though the bottom or top rings of the series may be semi
conical, and these tapering faces may be either plain or radially corrugated, tapering
at an angle of greater or less extent. The object of this formation is to form the
intervals into circular wide mouthed apertures narrowing towards the centre, or
where corrugations are employed a series of apertures narrowing to the centre.
The result obtained is, that from whatever direction the wind may come it blows
through a narrowing passage or passages, and is thus increased in velocity when
striking across the mouth of the chimney top or ventilating shaft, and thereby
caused to induce a strong up or outward draught from the same. Any wind
striking downward upon the tapered face of the rings is deflected therefrom in a
more or less horizontal direction and aids the induced draught.
The top of the series may be conveniently formed into a conical cap on the
upper side, while the ring inside the taper may be fitted with a slightly domed
plate.
The lowest of the series may be formed in any manner convenient to fit in the
chimney or ventilating shaft to which it is to be applied.
The series may be held in suitable position by nuts upon bars passing through
the rings, so that when stored in quantity they may lie flat upon one another, and
further admit of regulation of the size of the intervals, or the whole apparatus
may be made rigid.
Our apparatus may be used at any angle or inclination, vertical, horizontal, or
otherwise, and may be constructed of any suitable material.
And in order that our Invention may be the better understood, we now proceed
to describe the Drawing annexed hereto and illustrative thereof, reference being
had to the letters and figures marked thereon.
Figures I. and II. are sectional and outside elevations respectively of our device
showing alternative forms of cap.
Figures III. and IV. are similar sectional and outside elevations, but representing
the employment of radially corrugated rings in place of plain rings, and showing a
third alternative form of cap.
Figure V. represents a plain and a corrugated ring in plan.
Figure VI. shows our device in a horizontal position communicating with a wall
ventilating shaft.
Figures VII and VIII. show our device with two rings and an open cap.
Like letters refer to like parts in each of the Figures.
A, A, A, are our radially coned rings ranged in axial series, and held in
position upon rods by nuts C, allowing of removal and close storage. The lower

page_text: side of cap A is formed to correspond with the ring immediately next below; and
similarly the upper side of the lowest ring A" is formed to correspond with the
ring immediately next above.
B, B, are the wide mouthed apertures produced by this formation, through
which the wind passes, increasing in velocity in the narrow throat over the axis of
the chimney or ventilator shaft, and thus inducing a strong upward draught
therefrom, which is further aided by any current of air striking upon the tapered
faces of our rings, and deflected therefrom in a more or less horizontal
direction.
The cap of our device may be closed, as shown in Figures II. and VI., in which
case it is conveniently coned to deflect any current of air in an outward direction,
or it may be open, as in Figures I., III., and IV., in which case we form the upper
side in a curved slope from the periphery of the ring to the mouth of the exit, as
in Figure I, or by a truncated cone in the hollow of the cap, as in Figures III.
and IV., so that any current of air may be deflected in an outward direction.
And having now fully described and ascertained the nature and object of our
Invention, and the manner in which the same is to be performed, be it known
that what we consider novel and useful, and desire to protect by our Lotters
Patent is,
The combination in a device for inducing or accelerating an outward draught
from chimney and other shafts of radially coned rings (plane or corrugated) ranged
in axial series with intervals, and with either coned or open cap, substantially as
and for the purposes specified.
In witness whereof, we, the said John Gilmore and William Richard Clark,
have hereunto set our hands and seals, this Fifth day of January, in
the year of our Lord One thousand eight hundred and eighty two.
Witness,
S. P. WILDING,
23, Rood Lane,
London, E.C.,
Patent Agent.
་ ་
1
JOHN GILMORE.
WILLIAM RP. CLARK. (L.S.)
(L.S.)