AN IMPROVED DRAUGHT GENERATOR
Year: 1860

page_text: LETTERS PATENT to George Frederic Chantrell, of Liverpool, in the
County of Lancaster, Furnace Engineer, for the Invention of "AN
IMPROVED DRAUGHT GENERATOR." -A communication from abroad by
Sealed the 7th June 1861, and dated the 13th December 1860
PROVISIONAL SPECIFICATION left by the said George Frederic Chantrell
at the Office of the Commissioners of Patents, with his Petition, on the
13th December 1860.
I, GEORGE FREDERIC CHANTRELL, of Liverpool, in the County of Lancaster,
Furnace Engineer, do hereby declare the nature of the said Invention for
"AN IMPROVED DRAUGHT GENERATOR," to be as follows (that is to say) :—
This Invention has for its object a simple and improved apparatus for
generating or improving the draughts in chimneys and air flues generally. To
construct an apparatus according to this Invention suitable for a chimney flue
or air shaft, having an opening at the top of, say, one foot square, take a
square tube of three feet long, and one foot diameter, remove one half of each
side of the tube at reverse anglés, so as to form two openings at reverse angles,
which openings extend two feet downwards, and at the foot of each opening
insert horizontally a right angle triangular piece, extending from one upright
corner piece to the other. The under sides of the angular gusset pieces are
made good or enclosed by a triangular piece of metal or other material, which

page_text: dies away into the corner of the tube about one foot below. By this arrange-
ment the flue opening partakes of a hexagonal form, inscribed within the
square. On the outside of the square tube, and an inch or two below the side
openings, the square tube is surrounded by an horizontal flange, of an irregular
octagon form, inscribed within a square of two feet diameter, upon which is
erected two vertical screens, which are of the same width, and placed parallel
to the inner edge of the horizontal gusset pieces, the apices of which coincide
in vertical line with the vertical centres of the screen pieces, which, with the
two angular covering pieces of the square tube, are surmounted by a flat
horizontal plate of an octagon form, so as to coincide with the horizontal flange
described. The lower flange, and the irregular octagon crown piece, are con-
nected together at their outer edges by four flat vertical screen pieces of one
foot wide, placed parallel to and six inches from the vertical sides of the square
tubular base of the apparatus, thus leaving an opening between each of these
last described plates of about eight inches, according to the thickness of
material used. The apparatus, which is acted upon by external atmospheric
currents, is secured to the top of a chimney flue or air shaft, by inserting the
lower end of the square tube into the opening thereof, and attaching it thereto
in any convenient way; or a flanch constructed on the lower end of the
-apparatus-may-be-used-to-hold-it-in-position, or it may be secured in any other
convenient way.
The principal of this Invention is equally applicable to round, octagon, or
other polygonal sided shafts.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Frederic Chantrell in the Great Seal Patent Office
on the 13th June 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
FREDERIC CHANTRELL, of Liverpool, in the County of Lancaster, Furnace
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirteenth day of December, in the year of our
Lord One thousand eight hundred and sixty, in the twenty-third year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said George Frederic Chantrell, Her special licence that I, the
said George Frederic Chantrell, my executors, administrators, and assigns,
or such others as I, the said George Frederic Chantrell, my executors,

page_text: administrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "AN IMPROVED DRAUGHT GENERATOR," the same
being a communication to me from abroad by Isadore Alleweireldt, residing
at Bruges, in Belgium, upon the condition (amongst others) that I, the said
George Frederic Chantrell, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed' in
the Great Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Frederic Chantrell, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement (that is to say) :-
:-
This my said Invention has for its object a simple and improved apparatus
for generating or improving the draughts in chimneys and air flues generally.
To construct an apparatus according to this my said Invention suitable for a
chimney flue or air shaft, having an opening at the top of, say, one foot
square,
I take a square tube of three feet long and one foot diameter, and
remove one half of each side of the tube at reverse angles, so as to form two
openings at reverse angles, which openings extend two feet downwards, and at
the foot of each opening I insert, horizontally, a right angle triangular piece,
extending from one upright corner piece to the other. The under sides of the
angular gusset pieces I make good or enclose by a triangular piece of metal
or other material, which die away into the corners of the tube, about one foot
below. By this arrangement the flue opening partakes of an hexagonal form
inscribed within the square. On the outside of the square tube, and an inch
or two below the side openings, the square tube is surrounded by an horizontal
flange of an irregular octagon form, inscribed within a square of two feet
diameter, upon which I erect two vertical screens, which are of the same width,
and placed parallel to the inner edge of the horizontal gusset pieces, the apices
of which coincide in vertical line with the vertical centres of the screen pieces,
which, with the two angular covering pieces of the square tube, are surmounted
by a domed or a flat horizontal plate of an octagon form, so as to coincide
with the horizontal flange described. The lower flange and the irregular
octagon crown pieces are connected together at their outer edges by four flat

page_text: vertical screen pieces of one foot wide, placed parallel to and six inches from
the vertical sides of the square tubular base of the apparatus, thus leaving an
opening between each of these last described plates of about eight inches
according to the thickness of material used. This improved apparatus, which
is acted upon by external atmospheric currents, I secure to the top of a
chimney flue or air shaft, by inserting the lower end of the square tube into
the opening thereof and attaching it thereto in any convenient way, or a flanch
constructed on the lower end of the apparatus may be used to hold it in.
position, or it may be secured in any other convenient way. The principle of
this Invention is equally applicable to round, octagon, or other polygonal-
sided shafts.
That this my said Invention may be the more readily seen and understood,
I have hereunto annexed Drawings illustrating its application to a square and
a round chimney flue or air shaft. Like letters and figures marked thereon
have reference to similar parts.
Figure 1 is a side elevation of one of the improved draught generators
adapted to a square chimney or air shaft; and Figure 2 is an horizontal
transverse section of the same taken from a to b; and Figure 3 is a side
elevation of another draught generator of smaller-dimensions-internally-than-
the cavity of the chimney or air shaft to which it is applicable, and is par-
ticularly adapted for an oblong chimney or air shaft; Figure 4 shows a plan
of applying the Invention to a round chimney or air flue.
A, the hollow shaft upon which the draught generator is constructed;
B, the flue opening; C, (Figures 1, 2, and 3,) an horizontal octagon plate,
.upon which rests D, D', D2, and D³, outside flat vertical screen plates;
E and E', inner flat vertical screen plates; and F and F', right-angle screen
plates, formed by continuing up that portion of the hollow shaft A; G, the top
or covering plate, which, in some cases, I prefer to make with a lid, for con-
venience of cleaning the flue; H (Figure 4), a round flue opening; I, I¹, and
12 (Figure 4), are horizontal plates, upon which rest J, J¹, and J2, three flat
vertical external screen plates; K, K', K², K³, K', and K, six internal flat
vertical screen plates; and L, L', and L, three angular screen plates. The
straight arrows are used to denote the direction of the wind through the
apparatus, and the curved arrows the direction of the up current from
the flues.
Having now fully described and ascertained the nature of this the said
Invention for an improved draught generator, and how I believe the same
may be best carried into practical effect, I wish it to be understood that I do
not confine myself to the precise details or relative dimensions of the several

page_text: parts, as the same might be considerably varied without departing from the
Invention; but what I do claim is, the combination and peculiar arrangement
of the various parts herein-before described and set forth, or any mere
modification of the same, as applied to the construction of draught generators
in general.
In witness whereof, I, the said George Frederic Chantrell, have here-
unto set my hand and affixed my seal, this Twelfth day of June, in
the year of our Lord One thousand eight hundred and sixty-one.
10 Witness,
GEORGE FREDERIC (L.s.) CHANTRELL.
WILLIAM WALKER,
of 44, Castle Street,
Liverpool.