Improvements in Incandescence Gas Lamps for Railway Carriages and other Localities having Limited Head Room.
Year: 1894

page_text: Date of Application, 17th Apr., 1894
Complete Specification Left, 4th Jan., 1895-Accepted, 9th Feb., 1895
[Communicated from abroad by JULIUS PINTSCH, of No. 72/73, Andreas Strasse,
Berlin, in the German Empire, Engineer.]
Improvements in Incandescence Gas Lamps for Railway Carriages
and other Localities having Limited Head Room.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
Incandescent lamps of known construction cannot readily be employed for
railway carriages and other localities having a limited head room, in which the
lamps are suspended from the ceiling, as in such applications the considerable
height required by the burners would cause the glass globe to project down
too far, thus becoming liable to damage and obstructing the occupants of the
carriage, &c.
According to the present invention this inconvenience is obviated by dispensing
with the air and gas mixing chamber which, in ordinary incandescent lamps,
is situated immediately below the burner, and arranging such chamber at the side
of the burner so as to form part of the gas supply pipe, the continuation of which is
made to enter the side of the base of the burner.
By this arrangement the burner is reduced considerably in height, so that it
does not exceed that of an ordinary bats wing or Argand burner, and consequently
the glass globe does not extend down lower than with lamps having such
burners.
For this purpose the gas supply pipe, at its entrance into the lamp below the
reflector, is formed with a nozzle to which is attached a small surrounding
chamber having lateral holes for the entrance of air, like the mixing chamber
of a Bunsens burner, and from the lower end of this chamber the mixed gas
and air is led by a pipe into the side of the base of the burner.
This base may either be an entirely closed chamber with a perforated or wire
gauze top through which the mixture of gas and air issues into the surrounding
incandescence mantle; or the base may have a central vertical passage through it
for the admission of a farther quantity of air to the burner orifice, which is in this
case of annular form.
According to another improvement the incandescence mantle, instead of being
suspended from a wire support as in ordinary incandescence burners, has its lower
open end fixed in any suitable manner upon a flanged ring that is made to fit
easily upon a cylindrical upper part of the burner. By this means the incan-
descence mantle is rendered more compact and more easily removeable when
defective.
Surrounding the incandescence mantle there is by preference provided a short
glass cylinder, suspended in any suitable manner from the reflector of the lamp,
and serving to direct the air supply, entering in the usual manner through holes in
the top of the lamp, down to the lower end of the mantle; such glass cylinder
may however be dispensed with, as the draught of the ordinary metal chimney
provided above the reflector will generally be sufficient to insure the perfect action
of the burner.

page_text: It is expedient to provide means for preventing particles of ashes &c. thrown
out by the engine from falling through the chimney on to the mantle of the
burner, which would be deteriorated thereby. For this purpose there is fixed in
the outer chimney of the lamp a transverse metal shield having a central hole for
the draught, and at a certain distance above this hole is a bell shaped cap over-
lapping an upward projecting rim round the hole, so that any particles falling down
the chimney are arrested by the cap and shield.
Dated this 17th day of April 1894.
ABEL & IMKAI,
Agents for the Applicant.
Improvements in Incandescence Gas Lamps for Railway Carriages
and other Localities having Limited Head Room.
1, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
Incandescent lamps of known construction cannot readily be employed for
railway carriages and other localities having a limited head room, in which the
lamps are suspended from the ceiling, as in such applications the considerable.
height required by the burners would cause the glass globe to project down too
far, thus becoming liable to damage and obstructing the occupants of the
carriage &c.
According to the present invention this inconvenience is obviated by dispensing
with the air and gas mixing chamber, which, in ordinary incandescent lamps, is
situated immediately below the burner, and arranging such chamber at the side of
the burner so as to form part of the gas supply pipe, the continuation of which is
made to enter the side of the base of the burner.
By this arrangement the burner is reduced considerably in height, so that it
does not exceed that of an ordinary bats wing or Argand burner, and consequently
the glass globe does not extend down lower than with lamps having such
burners.
I will describe the construction of a lamp with the improvements applied
thereto, with reference to the accompanying drawing in which
Fig. 1 shews a vertical section of the lamp,
Figs. 2 and 3 modified forms of the burner,
Figs. 4 and 5 modifications of the incandescence mantles, and
Fig. 6 is a plan of the shield and cap.
The gas supply pipe A at its entrance into the lamp below the reflector G is
formed with a nozzle to which is attached a small surrounding chamber B having
lateral holes for the entrance of air, like the mixing chamber of a Bunsen's
burner, and from the lower end of this chamber the mixed gas and air is led by a
pipe C into the side of the base of the burner D.
This base may either be an entirely closed chamber with a perforated or wire
gauze top as at Fig. 3, through which the mixture of gas and air issues into the
surrounding incandescence mantle; or the base may have a central vertical
passage through it for the admission of a farther quantity of air to the burner
orifice which is in this case of annular form, as at Fig. 2.
According to another improvement the incandescence mantle, instead of being
suspended from a wire support as in ordinary incandescence burners, has its lower
open end either merely fitted tightly upon or fixed in any suitable manner upon a
flanged ring K Figs. 4 and 5 that is made to fit easily upon a cylindrical upper

page_text: part of the burner D as at Fig. 4. By this means the incandescence mantle is
rendered more compact and more easily removeable and replaced by a new one
when defective; the ring K can of course be used over again when the mantle is
destroyed for the attachment of a fresh mantle, which is easily effected.
Surrounding the incandescence mantle there is by preference provided a short
glass cylinder E Fig. 1 suspended in any suitable manner from the reflector G
of the lamp, and serving to direct the air supply, entering in the usual
manner through holes F in the top of the lamp, down to the lower end of the
mantle; such glass cylinder may however be dispensed with as the draught of the
ordinary metal chimney Q provided above the reflector will generally be sufficient
to insure the perfect action of the burner.
It is expedient to provide means for preventing particles of ashes &c. thrown out
by the engine from falling through the chimney on to the mantle of the burner,
which would be deteriorated thereby. For this purpose there is fixed in the outer
chimney of the lamp a transverse metal shield N having a central hole O for
the draught, and at a certain distance above this hole is a bell shaped cap M
overlapping an upward projecting rim round the hole, so that any particles falling
down the chimney are arrested by the cap and shield.
Holes P are also formed round the periphery of the disc N for the escape of
the gases.
Thus should any particles fall into the chimney, they will only pass through the
side opening P on to the reflector G of the lamp; and the incandescence mantle
will be effectually protected against injury thereby.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an incandescence gas lamp for railway carriages and other localities
having limited head room, arranging the mixing chamber B for the gas and air at
the side of or above the burner in such manner that the gaseous mixture is caused
to flow from such chamber downward towards the burner, in the same direction as
the supply of air thereto, substantially as described.
2. In an incandescence gas lamp with mixing chamber arranged as set forth in
the first claim, causing the pipe C conveying the gaseous mixture to enter the side
of the burner chamber D, substantially as described.
3. In an incandescence gas lamp such as is referred to in the first claim,
carrying the incandescence hood by means of a ring or equivalent device fixed to
its lower end, which is adapted to be fitted on to the top of the burner, sub-
stantially as described.
4. In a railway carriage incandescence gas lamp such as is referred to in the
first claim, constructing the chimney with a shield N with central opening
protected by a cap and with openings at the periphery, substantially as and for
the purposes described.
Dated this 2nd day of January 1895.
ABEL & IMRAT,
Agents for the Applicant.