Improvements in and relating to Railway Carriage Lamps.
Year: 1893

page_text: Date of Application, 14th Feb., 1893
Complete Specification Left; 14th Nov., 1893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Railway Carriage Lamps.
I, DAVID WILLIAM SUGG of Vincent Street in the City of Westminster,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the adoption, as a railway carriage lamp, of the inverted
gas lamp for which I obtained two several Letters Patent dated 21st February
1884, No. 3707, and February 16th 1887, No. 2440, respectively, and in the
combination therewith of means for ventilating the carriage.
In carrying out this invention, I prefer to employ the form of lamp described in
the second Patent above referred to.
The gas supply pipe and the burner are arranged concentrically with a central
air passage open at top to the entrance of air, the products of combustion being
collected in an inverted trough connected by means of two hollow arms with a
chimney.
The central gas pipe is in communication with a lateral gas chamber, to which
gas passes from the main gas supply pipe in any convenient manner, this pipe being
provided with a suitable cock, which may be turned by means of a key from inside
the carriage.
The lamp will be carried in the opening by a perforated metal support, the
perforations being formed with a tool which will leave an upwardly projecting burr
on the topside.
The lamp will be surrounded above the support, with a cylindrical wind-guard,
which will carry a horizontal partition by which the vitiated air from the carriage
will be prevented from entering the lamp. Outside the partition will be another
cylinder, which will be perforated with holes having the burr outside. These holes
will provide for the exit of the vitiated air, it being assisted thereby by the passing
of the lamp case through the air, which will cause a vacuum, & so suck out
the air.
The lamp and chimney are provided with an inverted funnel-shaped cover, and
in the lower part of which air inlet holes, with burrs inside, are formed while the
upper part has outlet holes with external burrs.
This arrangement has the effect of equalising the pressure of the air, so that the
lamp will burn steadily, whether the carriage is stationary or moving.
The glass globe of the lamp will be arranged so as to be hermetically sealed to
the entrance of air from the carriage, and means will be provided whereby it may
be unlocked for removal, for cleaning, and locked again from the inside of the
carriage by the attendant.
Dated this 14th day of February 1893.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Railway Carriage Lamps.
1 DAVID WILLIAM SUGG of Vincent Street, in the City of Westminster,
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 relates to the adaptation, as a railway carriage lamp, of what are
known as inverted gas lamps, and more particularly of the inverted gas lamp for
which obtained two several Letters Patent dated 21st February 1884, No. 3707,

page_text: and February 16th 1887, No. 2440, respectively, and in the combination therewith
of means for ventilating the carriage.
In carrying out this invention, I prefer to employ the form of lamp described in
the second Patent above referred to, in which the gas supply pipe and the burner
are arranged concentrically of a central air passage, open at top to the air, and at
bottom to the lamp glass, the products of combustion being collected in an inverted
trough (external to the air passage) connected by means of two hollow arms with
a chimney.
And in order that my present invention may be clearly understood, I will proceed
to fully describe it with reference to the accompanying drawing, in which
Fig. 1 represents the lamp in sectional elevation applied to the roof of a railway
carriage.
Fig. 2 illustrates a mode of securing the glass globe to the lamp.
A represents the roof of the railway carriage, with the usual lamp opening, and
A' is an annular block surrounding the opening, and serving to carry the lamp. On
the top face of this block, is a metal ring with an annular ridge A, the purpose of
which will be presently explained. B represents the inverted lamp, preferably of
the form before referred to, or of any other form of inverted gas lamp that is
suitable for the purpose.
The lamp is supported in the opening of the roof by the flange 1, cylinder 2,
annular disc or conical portion 3, and cylinder 4, which latter is open at top, and is
securely attached at bottom to the body of the lamp. The flange 1 may take the
form of an annular casting formed with a recess 1, which fits over the annular
ridge A, and forms a rainproof joint.
It will be seen that the parts 2, 3, and 4 form a chamber C external of the lamp,
and having no connection whatever with the lamp portion.
This chamber is closed at bottom by the annular perforated plate C', which fills
up the space between the lamp and the edge of the lamp opening in the roof of the
carriage, and is permanently attached to the roof.
The perforations in the plate C¹ are made with a tool which produces an inwardly
projecting burr, and through these perforations the vitiated air from the com-
partment passes into the chamber C, and from thence into the air, through
perforations C in cylinder 2, forming the outer wall of the chamber C, the burrs in
this case projecting outwards. I thus provide for the ventilation of the com-
partment, the arrangement of the burrs not only preventing the entrance of air, but
rather inducing an exhaust, which draws the air from the compartment, the draught
being somewhat increased by heat from the lamp.
I place behind the opening C a curved guard C³, which will serve to catch any
dust or rain that may enter the openings, and prevent their passing into the carriage
through the openings in the perforated disc C¹.
Above the chamber C, is secured a casing D, which encloses the chimney of the
lamp. This casing may be of two diameters, the larger (at the bottom) being
perforated at D₁, the perforations having the burrs inwards, to admit of air entering
to support combustion in the lamp, while the smaller diameter has perforation D
near the top, with the burrs outwards. As before stated, the outwardly extending
burrs do not only prevent the entrance of air, but, if anything, produce a slight
exhaust, which serves to draw the products of combustion out, and induce an inward
current of air at the bottom.
Outside this casing D, I provide a windguard W, in which are formed
perforations W' and W', similar to, and corresponding in number with the
perforations D and D' of the casing D. I find it desirable, also, to provide an
internal guard D* round the upper part of the chimney of the lamp. The chimney
may be divided, and the upper part may be carried by the guard D*, as shewn.
The separation of the ventilating space C from the lamp serves to prevent the
disturbance or extinguishing of the lamp, when the doors or windows of the carriage
are closed, as the lamp will draw its supply of air from outside, and not from inside
the carriage.

page_text: By the arrangement of the burrs in the casing D and wind guard W, the lamp
will burn under the same conditions as in a room, and the passing of the carriage
through the air will have no effect on the steadiness of the flame.
The air entering the perforations W' and D', and passing over the conical portion
or cover 3 of the chamber C, before entering the cylinder 4, gives time for any dust
or rain entering the openings with it, to settle in a position where it can be readily
removed, and the air alone thus passes down the cylinder 4 to the lamp.
B' is the central gas supply pipe, which is in connection, by a lateral passage 5
and a vertical passage 6, with the laterally extending supply pipe 7. This pipe 7
is connected with the main of the carriage in any convenient manner, for example,
through the plug hinge X as is now well understood.
Z is an adjusting cock or plug, by turning which the exact quantity of gas suitable
for each particular burner, at a given pressure, regulated by a suitable governor on
the carriage, will be allowed to pass, and when this quantity is once ascertained, it
will be maintained constant by the cock.
Fig. 2 shews a mode of securing the glass to the lamp.
The glass globe R is formed with a flange, the upper face of which is ground to fit
against the body of the lamp at a, which is also faced true. The globe R is held
up by the ring S, which is supported by a hook S' and the spring rods T T secured
to the cylinder 4, but any other mode of securing the glass with a tight joint may
be adopted. The ring S is binged to a forked lug b on the lamp body, the pivot
pin working in slots in the lug, so as to admit of a certain amount of play, to provide
for different thicknesses of flange on, and the expansion of, the globe. The pivot
pin will also fit into the forked end of the spring rod T", which, with the rod T,
will keep the globe close against the body.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The adaptation to a railway carriage, of an inverted gas lamp of suitable form
or construction, and the combination therewith of means for ventilating the carriage
by the lamp opening, independently of the air supply to the lamp, as set forth.
2. In a railway lamp, the mode of supporting an inverted gas lamp in the roof
opening, as shewn, and described, whereby the ventilation of the carriage may be
effected without risk of disturbing the steadiness of, or extinguishing the flame,
when shutting the carriage doors or windows, as set forth.
3. The ventilating railway carriage lamp constructed and arranged as herein
shewn and described.
4. The means substantially as shewn and described for maintaining an air-tight
joint between the glass globe and the lamp body, irrespective of the expansion and
contraction of the parts and the thickness of the flange of the globe, as set forth.
Dated this 14th day of November 1893.
NEWTON & SON,
Agents for the Applicant.