Improvements in Gas Lamps.
Year: 1893

page_text: Date of Application, 18th Mar., 1893
Complete Specification Left, 17th Jan., 1894-Accepted, 24th Feb.,
1894
PROVISIONAL SPECIFICATION.
Improvements in Gas Lamps.
1, THOMAS Coorer Jons Thomas, of 5 Carlton Road, Finsbury Park, in
the County of Middlesex, Engineer, do hereby declare the nature of this invention
to be as follows :-
This invention has reference to improvements in gas lamps having one or more
vertical, horizontal or otherwise arranged flat flame burners within a closed globe
or bowl and suitable for overhead lighting as for example in railway carriages, and
it has for object to enable such lamps to be worked on the regenerative principle
that a much greater illuminating power can be obtained for a given consumption
than is the case with such lamps as heretofore constructed.
of
gas
For this purpose 1 combine with the chimney a reflector, part reflector, or baffle
arranged above the flat flame burner or burners, a casing so constructed and
arranged as to form an air chamber that will be heated by the hot gases and
products of combustion escaping through the chimney, the said chamber being
in communication with the external atmosphere and with the interion of the lamp
bowl.
In one arrangement the chimney is of conical shape provided at its lower end
with a conical extension terminating in a rim that rests within a dished annular
perforated casing the bottom of which may advantageously be of flat frimented
conical form and is made to serve as a reflector. Around the chimney and above
its conical extension, is arranged a casing that may be doubly coued and is
arranged to form with the chimney and its extension and the dished casing an air
chamber that is in communication through the perforations in the dished casing
with the interior of the lamp bowl. Above the burner and directly below the
chimney is a baffle plate the centre of which may be dished and the periphery of
which passes between the reflector and the lower conical extension of the chimney
so as to form with these parts a zig zag annular passage through which the hot
gases and products of combustion can escape to the chimney and in the passage
Beat the air chamber. The several parts may be connected together so that they
can be readily removed from the lamp casing for cleaning and easily replaced
without special adjustment each time, the construction moreover being such as to
obviate liability to mislaying of separate parts and to admit of utilising casings of
lamps already in use when applying my invention.
In some cases the bottom of the dished casing forming the reflector may be
nearly or wholly removed, the baffle plate below the chimney being then made to
serve as the reflector, either alone, or in conjunction with the lower part of the
air chamber between which and the baffle plate there is an annular exit opening for
hot gases and products of combustion. In another construction the dished casing
is removed, the underside of the conical extension of the chimney being made to
serve as a reflector and the lower larger edge of the outer casing being extended so
as to rest upon the rim of the lamp bowl or upon a ledge or support above the same.
In this case the baffle plate above the burner is smaller and arranged to form an
annular exit passage with the base of the chimney. In each case the baffle or the
central portion thereof may be dished so that its underside may be concave, spherical
conical or of other suitable form; also a baffle or guard may be placed above the
chimney and also above the entrance to the air chamber.
When applying my invention to gas lamps such as railway carriage roof lamps
oon-tructed with a hinged curved gas supply pipe extending down into the lamp

page_text: bowl and carrying a burner or imrners, as in constructions of lamps now in comm
use, the reflector casing and air chamber or air chamber alone, as the ease may be
is formed with a grove or recess to accommodate such pipe. Or the gas supply
pipe with burner or bumers may be carried by the combined chimney and air
chamber and he arranged to turn on a hinge or joint as in the construction of
regenerative gas lamp described in the Specification of another application for
Letters Patent filed by me dated 1 December 1892 No. 22033.
The reflector may be arranged to move with the other parts, or be made separate,
In the former case I provide it with a ring free to adjust itself in a vertical sense
and adapted to rest upon the rim of the lamp bowl or upon a ledge or support in
supports above that rim. When the separate dished easing is dispensed with this
Tag may be arranged around the air chamber.
To render lamps of the kinds referred to practically wind proof, as for example
when they are used for railway carriage lighting, I construct the lamp head with
an opening though its top and with lateral perforations protected by a conical
baffle plate or guard and over such head secure a perforated cup, the arrangement
being such that hot gas and products of combustion can escape freely but rain and
wind will be prevented from entering the lamp head and affecting the steadiness of
the flame or flames.
My invention may advantageously be applied to railway carriages lighted with
oil gas supplied from a cylindrical reservoir supported below the carriage and
in which the said gas is stored under pressure.
In order that these reservoir-
may be made manch fighter in weight than those non commonly used and yet
sufficiently strong to contain the oil gas under the desired pressure, they may he
corrugated circumferentially after the manner of corrugated Steam boiler furnaces
or flues.
Dated this 4th of March 1908
W. LLOYD WISE,
Per W. Cross,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION,
Improvements in Gas Lamps.
I, THOMAS COOPER JOHN THOMAS, of 5 Carlton Road, Finsbury Park, in
the County of Middlesex, Engineer, 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 :--
This invention has reference to improvements in gas lamps having one or more
vertical, horizontal or otherwise arranged flat flame burners within a closed globe
or bowl and suitable for overhead lighting, as for example in railway carriages,
the object being to enable such lamps to be worked on the regenerative principle
and so that a much greater illuminating power can be obtained for a given
consumption of gas than is the case with such lamps as heretofore constructed.
For this purpose I combine with the chimney of a lamp of the kind referred to,
a reflector, part reflector, or baffle arranged above the flat flame burner or burners
and below the opening in the chimney, and a casing so constructed and arranged
as to form an air chamber that will be heated by the hot gases and products of
combustion escaping through the chimney, the said chamber being in communica-
tion with the external atmosphere and with the interior of the lamp bowl, the whole
forming what is sometimes hereinafter referred to, for the sake of brevity, as a
compound reflector that is readily removable from and replaceable within the lamp
ensing. As will be obvious compound reflectors such as referred to can be
constructed in various forms.

page_text: In the accompanying drawings,
Fig. is a vertical section illustrating one construction of such combined
chimney, reflector, baffle and air regenerator chamber shown applied to a non-
regenerative railway carriage roof lamp of known construction having a single flat
flaine burner so as to convert such lamp into a regenerative one.
1 is the chimney of conical shape, provided at its lower end with a slightly
conical extension 1 terminating in a rim 1 that rests within a dished annular
perforated casing 2 the bottom portion 2 of which may advantageously be of Hat
truncated conical form as shown, and is enamelled or otherwise made to serve as
an annular reflector. Around the chimney 1 and above its conical extension 1* is
arranged a casing 3, that may be doubly coned as shown, and is arranged to form
with the chimney and its extension and the disited casing an air chamber 4 that
is in communication, through the perforations 2 in the side of the dished casing 2
with the interior of the closed lamp bowl 5. Above the flat. flame burner 6 and
directly below the chimney 1 is fixed a baffle plate 7 the centre of which may be
made concave on the underside as shown in full lines, or convex as shown in dotted
lines or of other desired shape and the outer peripheral portion 7* of which passes
between the outer annular reflector 2 and the lower conical extension 1 of the
chimney so as to form with these parts a zig-zag annular exit passage 8 through
which the hot gases and products of combustion can escape to the chimney, and in
their passage heat the inner wall of the said air chamber so that air passing
through the said air chamber and entering the lamp bowl will be highly heated.
That portion of the underside of the buffle plate 7 that is exposed to view is
enamelled or otherwise made to serve as a reflector so as to obviate the presence
of the dark space usually observable in overhead lamps and corresponding to the
open lower end of the chimney. The said reflector also serves to prevent dirt that
may enter the chimicy from falling upon the burner or burners 6 and clogging the
gas passages therein. This is a point of considerable importance in the case of
railway carriage gas lamps where, in consequence of the almost universal use of oil
gas in such lamps, the gas passages in the burners must be made very small, and are
therefore liable to become easily stopped up by any dirt that may fall
הסקוו
them.
The several parts constituting the compound reflector are connected together
by any suitable means, such as by distance pieces and bolts 9 as shown, so that
they can be readily removed as one piece from the lamp casing for cleaning,
and easily replaced, without special adjustment each time, the construction
moreover being such as to obviate liability to mislaying of separate parts and to
admit of utilising easings of lamps already in use when applying my invention.
The casing 2 forming the reflector may however, if desired, be made separate
from the other parts, which may then simply rest in it.
Fig. 2 is a vertical section illustrating a modified construction of compound
reflector in which the rim portion 1 of the chimney extension 1* instead of
resting upon the bottom of the casing 2 as in the previous arrangement, is
connected to an annular plate 1, of flat truncated conical form, contected with a
similar plate 1 the underside of which is made to serve as the reflector proper.
In this arrangement the plates 1 and 1d serve to lengthen the air chamber 4 and
increase its heating surface, and also to form a single annular air exit 25 in lieu
of a number of perforations as in the previously described arrangement.
In some cases the bottom portion 2 of the dished easing 2 forming the reflector,
may be removed as shown in vertical section in Fig. 3, the baffle plate 7 below the
chimney being then made to serve as the reflector, either alone, or in conjunction
with the lower part 4 of the air chamber 4 between which and the baffle plate
there is an annular exit opening 8 for hot gases and products of combustion.
In the further modified construction shown in Fig. 4 the dished casing 2 (Fig. 1)
is omitted, the underside of the conical extension 12 of the chimney being in this
case made to serve as a reflector, and the lower larger elge of the outer casing 3 is
extended as shown at 3, so that it can be caused to rest upon the rim of the lamp
bowl, or upon a suitable ledge or support above the same as hereinafter described.

page_text: In this case the combined baffle plate and part reflector 7, which is arranged below
the chimney 1 and above the burner, is smaller and arranged to form an annular
exit passage with the base 1 of the chimney. 10 is a three-arm support by
which 7 can be fixed to the chimney.
In each case the combined buffle and reflector 7, or the central portion thereof,
may be dished so that its underside may be concave, spherical, conical or of other
suitable form. A baille or guard 11 may in each case if desired be fixed above
the chimney as shown in Fig. 1, and a battle or guard 12 may also be fixed above
the entrance to the air chamber 4 (Figs. 1, 2, 3 and 4).
Fig. 1 shows the application of a compound reflector of the construction first
herein described, to a railway carriage roof lamp constructed with a hinged curved
gas supply pipe 13 pivoted at 14 to a main gas supply pipe and extending down
into the lamp bowl where it is provided with a flat flame burner 6, (or there may
be more than one burner) as in constructions of gas lamps now in common use for
railway carriage lighting. In this case the compound reflector is formed with a
vertical groove or reress 18 shown more clearly in Figs. 3 and 4 to accommodate
the pipe 13. In the arrangement shown in Fig. 1, the compound reflector is simply
supported in place by a flange 13 formed on the easing 2 and arranged to bear
upon the ring 16 ordinarily employed to retain the bowl 5 in place. By this
arrangement the compoun 1 reflector can be readily lifted out for cleaning or other
purpose after the lamp head 17 has been turned back upon its hinge.
The gas supply pipe 13 with one or more burners 6 may however be secured to
the compound reflector as shown in vertical section in Fig. 5 so that the whole
can, after the lamp head 17 has been turned back, be turned outward as one piece
about the hinge or joint 14 as a centre. The several parts are supported in position
for use by the horizontal pivoted portion of the gas supply pipe 13, which then
rests upon the lamp body 19 at the point 19. The dished casing 2, 2 forming the
reflector in lis example, may be arranged to move with the other parts, or be made
Separate. In the example shown the several parts are connected together so that
they move as one piece. In this case the compound reflector is provided with a
ring 20 which is free to adjust itself in a vertical sense, when the combined
compound reflector and gas supply pipe are turned into their inward position for
-e, and which is adapted to rest upon the rim of the lamp bowl 5, or upon the
retaining ring 16, when such ring is used, and prevent air entering the lamp bowl
(except perhaps to a very small extent except through the air regenerator 4.
To render lamps of the kind hereinbefore referred to, practically wind proof, as
for example when they are used for railway carriage lighting, I construct the lamp
head 17 with an opening 22 through its top as shown in Figs. I and 5, and with
lateral perforations 23 protected by an inner conical bafile plate or guard 24, and
over such head I secure a cap 25 formed with perforations 26, the arrangement
being such that hot gas and products of combustion can escape freely through the
openings 22 and 26 But rain and wind entering through the perforations 23 and 26
respectively, will be prevented from descending the lamp head and effecting the
steadiness of the flame or flames.
My invention may advantageously be applied to railway carriages lighted with
oil gas supplied from a cylindrical reservoir supported below the carriage and in
which the said gas is stored under pressure.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a railway carriage roof lamp constructed with one or more burners arranged
to burn in a closed globe or bowl and carried by a hinged or jointed gas supply
pipe, a chimney, a casing forming therewith an air heating passage or chamber,
and a reflector-baffle so arranged below the chimney as to prevent the direct
upward passage of hot gases from the burner or burners to the chimney and so as
to form with the said chimney an exit passage for the said hot gases which in

page_text: -caping are caused to heat the wall of the said air regenerator, these parts being
ombined and arranged so as to form a compound reflector having no dark central
pace and adapted to be readily removed from and replaced within the lamp casing
as one piece, either with the hinged or jointed gas supply pipe or independently
thereof substantially as herein described.
2. For railway carriage roof lamps, separately detachable and replaceable
compound reflectors constructed and arranged substantially as hereinbefore
described with reference respectively to and shown in Fig. 1; in Fig. 2; in Fig. 3
aud in Fig. 4 of the drawings annexed, these reflectors being constructed with a
vertical groove or recess 18 for the passage of the pivoted gas supply pipe as set
forth.
3. A regenerative railway carriage roof lamp having a hinged gas supply pipe 13
with burner 6, and a separately removable compound reflector, these parts being
constructed, combined and operating substantially as hereinbefore described with
reference to and shown in Fig. 1 of the drawings annexed, or modified by the
substitution for the compound reflector shown in Fig. 1 of that shown in Fig. 2;
or in Fig. 3; or in Fig. 4 as set forth.
4. A regenerative railway carriage roof lamp having a combined hinged or
jointed gas supply pipe with burner or burners and compound reflector with loose
ring 20 these parts being constructed and arranged substantially as hereinbefore
described with reference to and shown in Fig. 5 of the drawings annexed.
5. A regenerative railway carriage roof lamp of the kind herein referred to in
which the lamp head is constructed with an opening 22 through its top and with
lateral perforations 233 protected by a conical battle plate or guard and there is
secured over such head, a cap 25 formed with perforations 26 substantially as
hereinbefore described with reference to and shown in Figs. 1 and 5 of the drawings
annexed for the purposes specified.
Dated thia 17th day of lann100
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.