Improvements in or relating to Incandescent Gas Burners.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Incandescent Gas Burners.
I, CHARLES REVILL BELLAMY, of The Corporation Gas Department, Hood Street,
Liverpool, in the County of Lancaster, Gas Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention relates to incandescent gas burners in which a suitable mantle
is heated to incandescence by an atmospheric gas burner; it is found in such
burners that there is a great tendency for the gas to light back when the lighting
flame is applied, as usual, to the top of the chimney. This lighting back occurs
frequently in the case of street lamps, and is due to the escape of gas through
the air inlet holes in the mixing chamber of the burner which takes place after
the gas is turned on and before it is lighted; the escaping gas conducts the light-
ing flame down to the said chamber where the gas supply is, in consequence,
lighted, instead of at the burner proper, and the object of my invention is to
overcome this difficulty.
In order to prevent the flame passing down to the mixing chamber I provide a
shield of wire gauze and interpose it in the path which the flame has to take in
order to reach the mixing chamber, so that the latter is protected by the shield
which acts in the same manner as the wire gauze in a safety lamp.
It is usual in incandescent burners to supply a circular plate which is fitted
immediately above the mixing chamber, and I find it convenient to fit the wire
gauze shield to this plate from which it extends upwards and outwards till about
level with the bottom of the gallery which carries the chimney; it is however
evident that the shield may be fitted in a variety of ways provided it intercepts
the flame on its way to the mixing chamber.
I have found that the shield not only effectually prevents lighting back, but also
serves to keep the flame of the burner steady in places where it is subjected to
sudden inrushes of air, as for example in shops, vestibules and the like where
the opening of an outside door is accompanied by an inrush of air which, with
burners as at present constructed, finds its way up one side of the chimney and
affects the light, but which, when the shield is fitted, is so diffused by passing
through the small mesh of the wire gauze as to be ineffective in disturbing the
flame.
Perforated metal may of course be substituted for the wire gauze, and the
shield and its support may be adapted to slip on to existing burners, or may be
made integral with the burner.
1
1800
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant,

page_text: Improvements in or relating to Incandescent Gas Burners.
I, CHARLES REVILL BELLAMY, of The Corporation Gas Department, Hood Street,
Liverpool, in the County of Lancaster, Gas Engineer, do hereby declare the
nature of this invention and in what maner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention relates to incandescent gas burners in which a suitable mantle
is heated to incandescence by an atmospheric gas burner; it is found in such
burners that there is a great tendency for the gas to light back when the lighting
flame is applied, as usual, to the top of the chimney. This lighting back occurs
frequently in the case of street lamps, and is due to the escape of gas through
the air inlet holes in the mixing chamber of the burner which takes place after
the gas is turned on and before it is lighted; the escaping gas conducts the light-
ing flame down to the said chamber where the gas supply is, in consequence,
lighted, instead of at the burner proper, and the object of my invention is to
cvercome this difficulty.
In order to prevent the flame passing down to the mixing chamber I provide a
shield of wire gauze and interpose it in the path which the flame has to take in
order to reach the mixing chamber, so that the latter is protected by the shield
which acts in the same manner as the wire gauze in a safety lamp.
It is usual in incandescent burners to supply a circular plate which is fitted
immediately above the mixing chamber, and I find it convenient to fit the wire
gauze shield to this plate from which it extends upwards and outwards till about
level with the bottom of the gallery which carries the chimney; it is however
evident that the shield may be fitted in a variety of ways provided it intercepts
the flame on its way to the mixing chamber.
I have found that the shield not only effectually prevents lighting back, but also
serves to keep the flame of the burner steady in places where it is subjected to
sudden inrushes of air, as for example in shops, vestibules and the like where
the opening of an outside door is accompanied by an inrush of air which, with
burners as at present constructed, finds its way up one side of the chimney and
affects the light, but which, when the shield is fitted; is so diffused by passing
through the small mesh of the wire gauze as to be ineffective in disturbing the
flame.
Perforated metal may of course be substituted for the wire gauze, and the
shield and its support may be adapted to slip on to existing burners, or it may be
made integral with the burner.
I have illustrated my invention as applied to an ordinary incandescent gas
burner in the accompanying drawings, in which Fig. I is an elevation partially
in medial section, and Fig. II is an elevation; irrelevant details of the burner
are broken away or omitted, and the same parts are indicated by the same
reference figures in each of the drawings.
1 is the burner, 2 is the mixing chamber with the air inlet holes 3, 4 is the
stem for supporting the mantle, 5 is the glass chimney, 6 is the gallery for carry-
ing the latter, 7 is the outer gallery for carrying a globe or the like, and 8 is
the plate usually fitted above the mixing chamber; all these are or may be of
the usual form.
9 is the wire gauze shield adapted as already described to intercept the flame
on its way from the chimney to the mixing chamber. The shield 9 is shown
attached to and carried by the plate 8, but it is to be understood that it may be
provided with a bottom quite independent of the plate 8, which may then be

page_text: dispensed with; it is evident, as already stated, that perforated metal may be
substituted for the wire gauze, and that the shield may be of any suitable shape
provided it intercepts the flame on its way to the mixing chamber.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
In combination with an incandescent gas burner, a shield such as 9 of wire
gauze or the like, interposed between the bottom of the chimney and the air inlet
holes of the mixing chamber, so as to prevent the conduction of flame to the latter
from the chimney and to diffuse the air supply; substantially as described and
illustrated.
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.