AN, IMPROVED DRAUGHT APPARATUS APPLICABLE TO STEAM ENGINES
Year: 1874

page_text: LETTERS PATENT to William Edward Gedge, of No. 11, Wellington
Street, Strand, in the County of Middlesex, Patent Agent, for the'
Invention of "AN, IMPROVED DRAUGHT APPARATUS APPLICABLE TO STEAM
ENGINES. A communication from abroad by Anatole Chevallier,
of No. 64, Faubourg St. Martin, Paris, France.
-
PROVISIONAL SPECIFICATION left by the said William Edward
Gedge at the Office of the Commissioners of Patents, with his
Petition, on the 23rd June 1874.
I, WILLIAM EDWARD GEDGE, of No. 11, Wellington Street, Strand, in
the County of Middlesex, Patent Agent, do hereby declare the nature
of the said Invention for "AN IMPROVED DRAUGHT APPARATUS APPLICABLE
TO STEAM ENGINES," a communication to me from abroad by Anatole
Chevallier, of No. 64, Faubourg St. Martin, Paris, France, to be as
follows:-
The chimney draught of steam engines, whether stationary or loco-
motive, is not always satisfactory when no contrivance increases its

page_text: intensity. Steam has long been used for this purpose. This steam
projected into the chimney creates a vacuum behind it, the effect of
which is to forcibly suck in the outer air through the fire-place. The
more complete the vacuum which it creates in the chimney the greater
the draught, and it is with the object of attaining this maximum of
effect that the apparatus for directing the jet of steam which forms the
subject of this Invention has been constructed. The use of this
apparatus gives an important saving in the heating of the generator of
the machine to which it is applied in this sense that it permits the
burning of the most inferior and consequently the cheapest fuel, its
consumption of steam is very small, and it may begin to act with a
pressure of less than two atmospheres.
The arrangements of the apparatus permit the production of the
vacuum in the chimney directly the steam is projected into it; the
result is an immediate draught, and all the more powerful inasmuch that
at this moment the steam is at full pressure, not having as yet undergone
any effect of condensation.
The accompanying Sheet of Drawing illustrates an apparatus em-
bodying this Invention, Fig. 1 representing same applied in a chimney,
and Fig. 2 an enlarged view of same detached. It is composed of a
tube A, the upper end of which opens to a funnel shape, and a solid
cone B is fixed in the centre of this opened mouth, so as to leave between
it and the tube only a small annular space a, four screws serving to
ს
keep the cone in the centre of the tube.
The action of the steam will be readily understood:-Arriving by the
tube A it meets in the cone B an obstacle to its exit, which obstacle
compels it to take the oblique direction of the generating point of the
cone, from whence it preserves this direction up to the sides of the
chimney, against which it strikes; it then escapes, driving the column
of air out of the chimney.
-
It is necessary to observe that this principle producing an escape of
steam in an oblique direction by means of an opened or large mouthed tube
with conical piece held in the centre of the open mouth may be applied
to all generators, whatever the form of their chimney, by suitably modi-
fying the shape of the apparatus.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Edward Gedge in the Great Seal Patent
Office on the 22nd December 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
EDWARD GEDGE, of No. 11, Wellington Street, Strand, in the County
of Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of June, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-eighth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William Edward Gedge, Her special licence
that I, the said William Edward Gedge, my executors, administrators,
and assigns, or such others as I, the said William Edward Gedge, my
executors, 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 APPARATUS APPLICABLE TO STEAM ENGINES," a communication to
me from abroad by Anatole Chevallier, of No. 64, Faubourg St.
Martin, Paris, France, upon the condition (amongst others) that I,
the said William Edward Gedge, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands
and seals, should particularly 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 William Edward Gedge, do hereby
declare the nature of the said Invention, and in what manner thie
same is to be performed, to be particularly described and ascertained
in and by the following statement:―
The chimney draught of steam engines, whether stationary or loco-
motive, is not always satisfactory when no contrivance increases its
intensity. Steam has long been used for this purpose. This steam
projected into the chimney creates a vacuum behind it, the effect of

page_text: which is to forcibly suck in the outer air through the fire-place. The
more complete the vacuum which it creates in the chimney the greater
the draught, and it is with the object of attaining this maximum of
effect that the apparatus for directing the jet of steam which forms the
subject of this Invention has been constructed. The use of this
apparatus gives an important saving in the heating of the generator of
the machine to which it is applied in this sense that it permits the
burning of the most inferior and consequently the cheapest fuel, its con-
sumption of steam is very small, and it may begin to act with a pressure
of less than two atmospheres.
The arrangements of the apparatus permit the production of the
vacuum in the chimney directly the steam is projected into it; the
result is an immediate draught, and all the more powerful inasmuch
that at this moment the steam is at full pressure, not having as yet
undergone any effect of condensation.
The accompanying Sheet of Drawing illustrates an apparatus em-
bodying this Invention, Figure 1 representing same applied in a chimney,"
and Figure 2 an enlarged view of same detached. It is composed of a.
tube A, the upper end of which opens to a funnel shape, and a solid
cone B is fixed in the centre of this opened mouth, so as to leave between
it and the tube only a small annular space a, four screws b. serving to.
keep the cone in the centre of the tube.
The action of the steam will be readily understood. Arriving by the
tube A it meets in the cone B an obstacle to its exit, which obstacle
compels it to take the oblique direction of the generating point of the
cone, from whence it preserves this direction up to the sides of the
chimney, against which it strikes; it then escapes, driving the column of
air out of the chimney.
Having now described and ascertained the nature of the said In-
vention, communicated to me as aforesaid, and in what manner the same
is or may be performed, I would have it understood that the form of the
apparatus may be modified to permit its application to all kinds of
generators, whatever may be the form of the chimney, and that this
Invention may be applied wherever having steam at command it is
desired to produce a draught, suction, or ventilation; further, that by a
the use of a cock regulating the escape of steam these three actions may
be regulated at will by means of this apparatus, and that I claim as
.

page_text: secured to me by the herein-before in part recited Letters Patent, the
use of a draught apparatus applicable to the fire-places of generators,
having for principle the production of an escape of steam in an oblique
direction by means,-