Improvements in Railway Carriage, Signal, and similar Lamps.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Railway Carriage, Signal, and similar Lamps.
We, ERNEST CLUSE HAINES, of Hygeia House, Staines, in the County of
Middlesex, Merchant, and FRANK BRACEBRIDGE MILLS, of 60 Hatton Garden,
in the County of London, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention for improvements in railway carriage signal and similar lamps has
for its object to improve the draught to these lamps so that they shall not be liable
to go out even when the light is turned down low and the speed of the train is high
or the wind gusty. Hitherto in such lamps an exhaust ventilator induces a draught
through the upper part of the lamp body and a secondary draught created by the
flame to be fed draws its supply from the primary draught at one point and rejoins
the said draught at another point.. When the light is turned low in certain cases
the light dies out for want of air. Now according to this invention, the light is
supplied with air more directly by the draught induced by the exhaust ventilator,
still leaving a separate course for any excess of air due to sudden fluctuations of
pressure or otherwise.
In one way of carrying out this invention as applied to an ordinary railway
carriage lamp, a cylinder extends from the top of the casing and surrounds the
usual orifice between the central cones and through which the primary draught
usually passes so that the said draught has to pass underneath the bottom edge of
the cylinder. Holes covered or not with gauze are provided at this point leading
to the transparent bowl surrounding the light so that the direct draught will be
more or less through the bowl. In a modification the dividing cylinder may be
continued to the bottom of the casing or be otherwise closed and suitable openings
closed or not by small flap valves opening outwards be provided. to take away any
excess air. The upper cone may also be dispensed with.
Doted this 26th day of June 1896.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.
COME
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Improvements in Railway Carriage, Signal, and similar Lamps.
We, ERNEST CLUSE HAINES, of Hygeia House, Staines, in the County' of
Middlesex, Merchant, and FRANK BRACEBRIDGE MILLS, of 60 Hatton Garden,
in the County of London, 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 for improvements in railway carriage signal and similar lamps

page_text: has for its object to improve the draught to these lamps so that they shall not be
liable to go out even when the light is turned down low and the speed of the train
is high or the wind gusty. Hitherto in such lamps an exhaust ventilator induces a
draught through the upper part of the lamp body and a secondary draught created
by the flame to be fed draws its supply from the primary draught at one point and
rejoins the said draught at another point. When the light is turned low in certain
cases the light dies out for want of air. Now according to this invention, the
light is supplied with air more directly by the draught induced by the exhaust
ventilator still having a separate course for any excess of air due to sudden
fluctuations of pressure or otherwise.
In one way of carrying out this invention as applied to an ordinary railway
carriage lamp, a cylinder extends from the top of the casing and surrounds the
usual orifice between the central cones aud through which the primary draught
usually passes so that the said draught has to pass underneath the bottom edge of
the cylinder. Holes covered or not with gauzes are provided at this point leading
to the transparent bowl surrounding the light so that the direct draught will be
more or less through the bowl. In a modification the dividing cylinder may be
continued to the bottom of the casing or be otherwise closed and suitable openings
closed or not by small flap valves opening outwards be provided to take away any
excess air. The upper cone may also be dispensed with."
In the accompanying sheet of illustrative drawings:
Fig. 1 is a sectional elevation of a lamp for lighting railway carriages constructed
according to this invention.
Fig. 2 shows an ordinary railway carriage lamp modified according to this
invention, and Figs. 3 and 4 show modifications of the same.
The lamp comprises the usual casing a a¹ fixed in the roof 6 of the carriage, the
glass bowl c attached to the part a' by the brass ring d hinged to the part a¹, the
hinged cover e and the ventilator f carried by the cover e. Fitting on the top of
the casing a is the perforated ring g provided with internal ribs h. On these ribs
rests the dividing cylinder i carrying the central cone . Above the cone / and
supported from the cover e are the two cones m n, the connection o between the
base of the upper cone and the upper part of the lower cone being perforated as
shown. Around the upper cone n is the ventilator consisting as shown of the
circular opening p in the hollow spheroidal body f and surrounded by the guard
ring r. The cover is provided with a spring disc s resting on the ring g
The draught passes up under the lower edge of the cover e through the holes in
the ring g where it divides, part passing direct between the cones land m and the
cones m and n to the ventilator and the remaining part passing between the ribs h
of the ring and down between the dividing cylinder i and the casing a to the light
in the bowl c.
Instead of using two cones m, n one cone only may be used, the advantage of two
cones is that a second by-current at o is provided to check excessive current at the
mouth of 1.
In the modification of the ordinary lamp shown in Fig. 2 the regenerator is
dispensed with and the burner is fed direct with cold air. The draught is guided
by a dividing cylinder or shield i and divides at the bottom of the shield instead of
at the top as clearly shown by the arrows, part passing up directly between the
lower edge of the shield i and the cone 7 and part passing directly through the usual
perforations to the bowl c. The gauze t serves to steady the draught.
Fig. 3 shows an improved modification of the arrangement illustrated on
Fig. 2 in which the bottom of the shield i between its circumference and the cone
is closed and provided with holes covered by mica flap valves vor a shutter to be
adjusted by hand.
The orifices
Fig. 4 shows the shield i perforated and provided with an adjustable shutter w
by which the orifices leading direct to the cones are adjusted in size.
leading to the burner may be protected by gauze.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
The improvements in railway carriage, signal and similar lamps, substantially as
described with reference to the drawings.
Dated this 26th day of April 1897
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.