Improvements in and connected with Non-regenerative Gas Lamps.
Year: 1889

page_text: Date of Application, 20th Sept., 1889
Complete Specification Left, 18th June, 1890-Accepted, 19th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in and connected with Non-regenerative Gas Lamps.
I, JAMES STOTT, of 174 Fleet Street, City of London, Gas Engineer, do hereby
declare the nature of this invention to be as follows:
-
My invention relates to certain improvements in and connected with that class of
gas lamps known as "Thorp's Non-regenerative Light" in which the heat from the
burners, preferably placed at an angle with the vertical, rises up into a dome placed
above them but in which there is no hole or outlet. The current of heat therefore
descends from the doine to find an escape and in doing so impinges upon and depresses
the gas flames, so that they assume a flattened or nearly horizontal shape the flow of
this current of heat also causing the flames or jets to become highly heated and
rarified which produces an increase in the illuminating power of the jets which then
burn with a nearly white light.
In the above described lamp, an objection has been found to its use in consequence
of the heat formed by the burners not being distributed equally over the inside and
over the outside surfaces of the deflector, thereby causing a tendency of the enamel to.
crack and the deflector to be rendered unserviceable. Another objection is that there
is no outlet provided for the escape of the products of combustion and heat.
.According to the first part of my invention, I place over the aforesaid dome or
deflector a ventilating canopy supported by an outlet shaft carrying off all the products
of combustion, which pass up round a circular passage in close proximity to the outside
surface of the dome or deflector, thus maintaining the outside at a temperature nearly
equal to that of the inside of the dome and preventing the cracking of the enamel due,
to difference of temperature.
The second part of my invention refers to the dome or reflector, which I form
mushroom shape, with a hollow conical, or tapered stem, the smaller part of the stem
being carried down to the lower end of the supply pipe near the burners.. This form
of deflector may be made in one piece only, or it may be in two or more parts, the
whole being enamelled and presenting a greater extent of reflective surface than with
the present form of dome.
According to the third part of my invention, I coat or cover the dome or deflector
of a Thorp Lamp, or a dome made in my improved manner, with asbestos, slag wool,
or other non-conducting material on the outside in order to maintain the heat and
guard against cold currents of air coming in contact with the outer surface. This
non-conducting material may have an outside cover of metal, if desired.
The fourth part of my invention consists in arranging a flap, damper, or valve in
some part of the ventilating shatt, which valve may be opened or shut from a distance,
say, the gas room of a theatre, by means of suitable connecting rods. This valve is
for the purpose of temporarilly closing the ventilating shaft when a cluster of burners
are to be lit by a pilot light, so as to cause an accumulation of gas. When the main
is turned on the gas will accumulate at and around the open burners and communicate
the flame to each of them, instead of at once passing off up the ventilating shaft.
When the burners are all lighted from the pilot light, the valve may be opened to
allow the escape of the products of combustion up the shaft.
My improvements are capable of modification to suit the particular description of
lighting apparatus to which the lamp is adapted, such as for street lamps, sun burners,
pendent lamps, standards and the like.

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Non-regenerative Gas Lamps.
I, JAMES STOTT, of 174 Fleet Street, City of London, Gas Engineer, do herchy
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 :-
My invention relates to certain improvements in and connected with that class of
gas lamps known as the Non-regenerative Light in which the heat from the burners
preferably placed at an angle with the vertical, rises up into a dome placed above
them but in which there is no hole or outlet. The current of heat therefore descends
from the dome to find an escape, and in doing so, impinges upon and depresses the
gas flames, so that they assume a flattened or nearly horizontal shape, the flow of this
current of heat also causing the flames or jets to become highly heated and rarefied
which produces an increase in thic illuminating power of the jets, which then burn
with a nearly white light.
In the above described lamp, an objection has been found to its use in consequence
of the heat formed by the burners not being distributed equally over the inside and
over the outside surfaces of the deflector, thereby causing a tendency of the enamel to
crack and the deflector to be rendered unserviceable. Another objection is that there
is no outlet provided for the escape of the products of combustion and heat.
According to the first part of my invention, I place over the aforesaid dome or
deflector A, Figures 1 and 2, a ventilating canopy B supported by an outlet shaft C,
carrying off all the products of combustion, which pass up round a circular
passage D in close proximity to the outside surface of the dome or deflector A,
thus maintaining the outside at a temperature nearly equal to that of the inside
of the dome and preventing the cracking of the enamel due to difference of
temperature.
The second part of my invention refers to the done or deflector A, which I
form mushroom shape, as shown in Figure 1, with a hollow conical, or tapered
stem E, the smaller part of the stem being carried down to the lower end of the
supply pipe F near the burners G.
This form of deflector is made in one piece only, or in two or more parts and
the hollow conical stem E of the dome or deflector A can be separate from the
upper part, as shown in Figures 2 and 3, in which case, the cone is in the form
of a tube surrounding the supply pipe F and held in position by the bulb H
The whole inside surface of the dome and stem is enamelled and presents a large
extent of reflective surface.
According to the third part of my invention, I coat or cover the dome or deflector A.
with asbestos, slag wool, or other non-conducting material on the outside in order to
maintain the heat and guard against cold currents of air coming in contact with the
outer surface. This non-conducting material may have an outside cover of metal, if
desired.
The fourth part of my invention refers to the adaptation of my improvements to a
street lamp or lantern which I show in Figure 4. In this view, the lamp consisting
of the burners G and the dome or deflector A is suspended from the supply pipe Fin
the upper part of the lantern J, and the lower edge of the ventilating canopy Bat K
is carried down below the level of the edge of the dome A, as shown in the drawing,
the object being to guide the heated air and products of combustion from the burners
up the shaft C
The space between the upper surface of the outlet shaft and canopy C and B and
the upper portion of the exterior casing of the lantern J forms the passage for the
current of air necessary to feed the lights in the lamp at G as shown by the indicating
arrows in the illustration. The passage of this feed current over the heated surface of
the ventilating shaft and canopy C and B has the effect of correcting the tendency of
the glass or other outer casing of the lantern becoming overheated.

page_text: My improvements are capable of modification to suit the particular description
of lighting apparatus to which the lamp is adapted, such as for sun burners, pendent.
lamps, standards lamps, and the like.
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. The combination with a non-regenerative gas lamp of the kind herein referred to,
of a cover forming a hot air passage around thic lamp deflector to ensure a high
temperature on the outside of said deflector and a passage for the products of combus-
tion in connection with a ventilating shaft for carrying off the same, as describedl
and substantially as shown in the annexed drawings.
2. Forming the domes or deflectors of gas lamps, herein referred to, with a hollow
conical stem, as and for the purposes described and substantially as shown.
3. Conting the outer surfaces of the deflectors with a non-conducting composition,
with or without a metal protective covering, as described and substantially as shown.
4. The combination in a lantern of a non-regenerative gas lamp of the kind herein
referred to, with a ventilating shaft having a canopy or dome at its base, and a feed
passage of air formed between the exterior of the ventilating shaft and the interior
surface of the lantern, substantially as shown and described.
The 18th day of June 1890.
H. GARDNER,
Patent Agent, 166, Fleet Street, London, Agent for the said James Stoit.