Improvements in Apparatus for Lighting and Extinguishing Gas Jets, Chiefly Designed for Street Lamps.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Lighting and Extinguishing Gas
Jets, Chiefly Designed for Street Lamps.
I, JOSEPH FROSSARD, of Porrentruy, in the Republic of Switzerland, Manufac-
turer, do hereby declare the nature of this invention to be as follows:-
One object of the present invention is to do away with the manual work involved
by the lighting and extinguishing of gas jets such as those in street lamps
intended to burn for a predetermined number of hours.
Another object of the invention is to attain an accuracy in the time of lighting
or extinguishing which could not possibly be obtained by a workman, as it is
quite impossible for him to be at the same time within reach of all the apparatus
which are committed to his care.
The invention comprises the combination of a wheel-work with a device intended
to cut off the source of light and with a mechanism acting upon the latter at
predetermined hours.
The apparatus comprises an inlet-pipe for the gas and a feed or supply pipe on
which the burner is secured. A small lighting-pipe is provided for supplying the
auxiliary burner or pilot light with gas, the said pilot light burning only in the
day-time.
The invention consists in connecting or disconnecting alternately at fixed hours,
the inlet and feed pipes and in connecting at other times the feed pipe and the
pilot pipe. This is done by means of a double-seat-valve connected with a valve
operating lever acted upon by means of a mechanism secured to a vertical support-
ing plate.
The said plate carries by means of pillars or distance pieces two other plates
besides a dial and a case, the latter being closed by a cover formed of a rim and of
a glass. The lever is pivoted to a projection forming one part of the supporting
plate; the said lever passes in the plane of the axis of the double-seat valve and
projects with its free end, bearing a pin, under the time mechanism which is
driven by means of wheel-work.
The obturator is composed of the aforesaid double-seat valve located in a case
contiguous to the inlet and feed pipes. The lower valve proper of this double
seat-valve is screwed thoroughly on a pin; the upper valve is loosely fitted on the
rod of the lower valve, and a spiral spring is provided between then surrounding
the said rod and tending to keep the valves apart; a screw secured to the upper
valve and engaging into a notch of the rod of the lower valve is intended to limit
the relative play of both valves.
The upper valve is guided by means of small wings in its casing it is intended

page_text: to prevent the gas from passing from the inlet tube into the feed tube through
holes in the valve casing.
The lower valve is guided by its lower hollow stem through a hole in the screw
cap of the casing, the escape of the gas through the opening being prevented by the
cone of the pin screwed into the said hollow stem when the lower valve is entirely
open. The seat of the said valve is at the top of the said screw cap and this valve
is intended to prevent the gas from passing from the inlet into the tube of the
pilot light. The double seat valve never remains in the medium position and
consequently the escape of the gas through the hole in the screw cap is only open
while the said valve is jumping from its lower position into its upper position
or vice-versa, as in each of these positions the said hole is stopped either by the
lower valve itself or by the cone. Such arrangement enables the valve to have free
play in the screw cap and there is thus no need to provide a stuffing-box in order
to form a joint between the stem of the valve and the said cap.
A device is provided on the inlet tube which is intended to heat the whole
apparatus in winter, so as to prevent the freezing of the oil which lubricates the
train of the mechanism. It is formed of a branch pipe or jet having a screw with
pointed end for controlling or stopping the escape of a gas intended to heat a small
wing forming part of the supporting plate.
The wheel work of the apparatus is located between the parallel plates secured to
the supporting plate and between one of the said parallel plates and the super-
posed bridges. The motor spring arranged in a spring barrel, has one of its ends
secured to the latter and the other to a shaft upon which there is screwed a wheel.
The teeth of the spring barrel act upon the usual watch-train formed of a train
of wheels and an escapement. The shaft of one of the wheels bears a pinion and
the minute-hand; the said pinion acts upon the barrel-wheel bearing the hour-
hand, which in the example chosen makes one revolution in 24 hours. This part
of the wheel-work is thus intended to indicate the hour on the dial and works
continuously.
The wheel which is secured on the shaft of the barrel acts upon a train which
is composed of the three members and of a butterfly-regulator. The shaft of one
member of this train bears a wheel which is intended to act, through the means
of a mechanism placed between the plate and the bottom of the case, upon the
herein before mentioned lever of the stopping device which has already been
described. On the other hand the butterfly regulator is alternately stopped by
means of a suitable device and acted upon by means of the minute-wheel of the
wheel-work described above located between one of the plates and the dial.
The barrel-spring which is secured to the shaft may be wound up in several
ways by means of a barrel passing through the case and bearing a regulating-
pinion gearing into the wheel on the shaft of the spring barrel. In order to allow
the backward rotation of the latter which is involved by such winding up, the pinion
of one of the members which is intended to convey the rotation of the said wheel
to the mover next member of the train, is connected to the shaft by means of a
sliding pinion.
The driving mechanism of the plug is composed of a cam lever a spring, and a
pin connecting the cam lever to the valve operating lever.
The cam lever is pivoted and connected at one end to the end of the spring which
is fixed at its opposite end, so that the latter will cause it to jump and assume
either the one or the other of its extreme positions without ever allowing it to
remain still in its medium position. The said cam lever is provided with a straight
face which is intended to be acted upon by means of one of the pins of a wheel in
order to bring the cam lever from one position to the other. The said cam lever is
moreover provided with an inclined edge which is also intended to be acted upon by
means of one of the pins of the said wheel in order to reverse the position of the
maid lever.
In the second named position of the cam lever the pin connected with the valve

page_text: operating lever presses the free end of the latter lever down which causes the
upper valve to be opened and the lower valve to be closed; the burner is then lit.
In the first position of the cam lever the said pin raises the free end of the valve
operating lever so as to cause the upper valve to be closed and the lower valve to
be opened; the burner is then extinguished, but the pilot light will still burn.
The stopping of the driving-mechanism of the plug is effected by means of a
rocking-lever, which is arranged with smooth friction in one of the aforesaid plates
and which is pivotted so as to move in a plane perpendicular to the latter. The
rocking lever is provided with a hook which may be brought in the path of the
wings of the butter-fly regulator, in order to stop the mechanism, which is caused
by the action of the cam lever by means of a bolt which slides on the rocking
lever. The tooth of the bolt will always, by passing through an opening in the
rocking lever restore the said lever to the stopping position in whatever direction
the bolt is moved.
The displacement of the said bolt is effected either in one direction or in the
other, by means of an arm which is secured on the shaft of the cam lever and
which acts upon projections of the bolt. Consequently every time the cam lever
jumps from the one into the other of its extreme positions in the manner which has
been described above, the arm will restore the rocking lever to the position in which
it stops the train.
The inverse displacement of the rocking lever, that is to say the starting of the
said train, is effected by means of a spring which is lodged between the barrel-
wheel and one of the plates and which is further secured to the latter so as to
oscillate in a plane perpendicular to that of the said barrel wheel. The spring
presses the barrel-wheel towards the dial.
The barrel-wheel is pivotted on a pin, which is secured to the said plate, and the
said plate is operated by means of a pinion with the help of an intermediate pin.
Between the dial and the barrel wheel there are provided two discs which are
provided with barrels which are concentric to that of the barrel wheel bearing,
each having a hand or pointer which hands are intended to be placed, the one on
the hour at which it is desired that the apparatus should light the burner, and the
other on the hour at which the latter is to be put out. The discs are connected
with considerable friction to the dial and thus they remain in the position in which
they were placed. Each of the said discs are provided with a tooth against which,
and at a determined hour, a projection of the barrel-wheel will stop. The latter
is then raised by means of the tooth on the lighting or extinguishing disc and then
released again. The raising of the barrel wheel is conveyed to the spring the pin
of which is then brought in the path of the butterfly until the projection of the
barrel wheel escapes from either the tooth of the lighting disc or the tooth of the
extinguishing disc which caused the barrel wheel to be raised.
A projection of the rocking lever is raised together with the spring and removes
the hook from the path of the wings of the butterfly. Considering the slowness
of motion of the barrel wheel, the motion of the rocking lever might not take place
at the predetermined hour, and so the pin is intended to keep back the mechanism,
after the rocking lever has been released, until the exact moment when it is to
work and which is determined exactly by the projection escaping the teeth of the
discs. As soon as this escape takes place the mechanism will work and cause the
cam lever to be moved out of place by means of one of the pins of wheel, until,
owing to the said lever jumping from its medium into its extreme position, the
arm acts upon the bolt and causes the butterfly to be stopped in the manner which
has been described above.
The operation of the apparatus is as follows:-
The spring of the barrel being wound up drives in a continuous manner the
hands indicating the hours and minutes on the dial when the hand of the clock
work arrives opposite one of the above mentioned hands, the projection meets the
teeth of either of the said discs and the spring which is driven back by means of

page_text: the barrel wheel, brings its pin in the path of the butterfly. At the same time
the barrel wheel drives back in its turn the projection of the rocking lever, and
moves the hook of the said lever out of reach of the butterfly, the pin of the spring
keeping the latter still during a lapse of time which will be determined by the
breadth of the projections on the discs.
When the projection escapes from the latter and the mechanism being acted
upon by the motor spring starts and causes the cam lever to jump thus acting
upon the valve either in one direction or in the other. The moment the cam
lever reaches the end of its stroke, its arm strikes the pin and causes the bolt to
be displaced either in one direction or in the other, which will, in both cases, restore
the rocking lever to the position in which its hook stops the butterfly.
The mechanism which is driven by means of the said motor spring is then
stopped again until the hand of the clock work reaches again one of the hands
or pointers.
Instead of the pilot-light, provided in the apparatus which has been described,
one may use some other lighting-device, for instance a box containing spongy
platinum, which becomes incandescent by mere contact with the gas. In this
case gas need be conveyed to the tube only during a very short time and not
during the whole time the burner is extinguished.
A modification of the apparatus consists in causing the pilot tube to end below
the seat of the lower valve instead of having it end above the same. When the
valve operating lever is pulling the rod downwards, the upper valve remains closed
during the first part of such motion, until the screw reaches the end of the recess
in the lower valve stem in which it is engaged. During that time the conical
part of the lower valve leaves its seat and allows the gas to pass into the pilot
tube, the rod constituting in the screw cap a joint which is tight enough to compel
the gas to enter the said pilot tube instead of escaping outside; then the lower
valve engages with its seat and gas is no longer admitted. The admission of gas in
the pilot tube is thus prevented by means of the lower conical part of the lower
valve when the upper valve is closed, and by means of the upper taper part of said
lower valve when the said upper valve is open.
I may instead of spongy platinum employ a lighting device which may be com-
bined with the arrangement of the double seat valve which has just been described.
Such arrangement is composed of a series of holes which are provided in the pilot
tube and which constitute a row of gas jets which work as such only during the
very short time during which neither of the conical parts are acting to prevent
the gas from reaching the pilot tube. Said jets may be combined with some kind
of lighting device acted upon by means of the valve operating lever. Such device
may be composed of a disc, carrying matches and of a spring rubbing-plate against
which the matches are successively lit when the disc is rotated. This rotation is
effected by means of some kind of gear which is acted upon by means of the valve
operating lever. The row of gas jets is of course extended as far as the burner.
In order to avoid the inconveniences which might result from the heat of sun-
rays, when this apparatus is placed in a street lamp, the apparatus can be
surrounded with a case of felt or other non-conductor of heat.
For the same purpose the studs or distance pieces connecting the wheel-work
with the plate, will further be arranged so as to reduce to a minimum the contact
faces between the supporting plate and the mechanism. The space between the
supporting plate and the box may also be provided with felt or some other non-con-
ductor of heat.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: Improvements in Apparatus for Lighting and Extinguishing Gas
Jets, Chiefly Designed for Street Lamps.
I, JOSEPH FROSSARD, of Porrentruy, in the Republic of Switzerland, Manufac-
turer, 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:-
One object of the present invention is to do away with the manual work involved
in the lighting and extinguishing of gas jets such as those in street lamps
intended to burn for a predetermined number of hours.
Another object of the invention is to attain an accuracy in the time of lighting
or extinguishing which could not possibly be obtained by a workman, as it is
quite impossible for him to be at the same time within reach of all the apparatus
committed to his care.
The invention comprises the combination of a wheel-work with a device intended
to cut off the source of light and with a mechanism acting upon the latter at
predetermined hours.
In order that the invention may be clearly understood I will now describe by
way of example, the constructional form shown in the accompanying drawings in
which the invention is applied to a gas-burner with various modifications of the
lighting-device. In these drawings
Figure 1 shows a portion of the pipe or standard intended to carry the gas-
burner and the improved apparatus as seen from the front.
Figure 2 is a side elevation of Figure 1 the apparatus being shown partly in
section.
Figure 3 is a vertical section drawn to an enlarged scale of the device for cutting
off the light.
Figure 4 is a section on the line ¹³ of Figure 3 looking upward;
Figure 5 is a front view of the wheel-work.
Figure 6 shows a development of the wheel-work taken in a plane through the
several axes.
Figures 7, 8 and 9 shows details or separate parts of the mechanism, Figure 9
being drawn to a larger scale.
Figure 10 shows a modified form of the device for cutting off the light.
In all the figures similar letters of reference refer to the same parts.
A is the inlet-pipe and B the outlet pipe for the gas, on which the burner C is
secured. D is a small lighting-pipe supplying the auxiliary burner or pilot light
with gas, the said pilot light burning only in the day-time.
The invention consists in connecting or disconnecting alternately, at fixed hours,
the pipes A and B and in connecting at other times the feed pipe A and the pilot
pipe D. This is done by means of a double-seat-valve EE connected with a
lever F acted upon in one or the other direction by means of a mechanism secured
to the plate G.
As will be seen in Figure 4, which shows only the frame of the mechanism with-
out the train, the said plate G carries by means of pillars or distance pieces two
plates H and I in addition to a dial K and a case L, the latter being closed by a
cover formed of a rim L' and of a glass . The lever F is pivoted to a projection
forming one part of the plate G; the said lever passes in the plane of the axis of
the double-seat valve E E¹ and projects with its free end, bearing a pin Q, under
the mechanism which is more particularly shown in the Figures 7 and 8.
This mechanism is driven by means of a wheel-work more especially shown in
Figures 5, 6, 8 and 9.

page_text: In the example shown in the drawings the obturator is composed of the aforesaid
double-seat valve EE located in a case A¹ contiguous to the inlet and feed
pipes A and B. The lower valve is properly screwed on a pin f; the upper valve El
is loosely fitted on the rod of the lower valve E, and a spiral spring is provided
between them surrounding the said rod and tending to keep the valves apart; a
screw e secured to the upper valve El and engaging into a notch of the rod of the
lower valve E is intended to limit the relative play of the said valves.
In Figure 3 the double-seat-valve is shown in its middle position in which it
never stands still.
.
The upper valve El is guided by means of small wings e¹ in its casing A¹; its
seat is at a¹, it is intended to prevent the gas from passing from the inlet tube A
into the feed tube B through holes a and b.
The lower valve E is guided by its lower hollow stem e² through a hole in the
screw cap of the casing the escape of the gas through the opening being pre-
vented by the cone f¹ of the pin when the lower valve E is entirely open. The seat
of the said valve E is at a and this valve is intended to prevent the gas from passing
from the inlet A into the tube 1 of the pilot light. As previously mentioned and
as will be seen from the description of the mechanism shown in Figure 7 the double
seat valve EE never remains in the medium position shown in Figure 3, and
consequently the escape of the gas through the hole in the screw cap a² is only
open while the said valve is jumping from its lower position into its upper position
or vice-versa, as in each of these positions the said hole is stopped either by the
lower valve E itself or by the cone f¹. Such arrangement enables the valve to
have free play in the screw cap a² and there is thus no need to provide a stuffing-
box in order to form a joint between the stem of the valve and the said cap a².
A device shown on the left of the tube A in Figures 3 and 4 is intended to
heat the whole apparatus in winter, so as to prevent the freezing of the oil which
lubricates the train of the mechanism. It is formed of a branch pipe or jet a
having a screw a with pointed end for controlling or stopping the escape of a jet
of gas intended to heat a small wing a forming part of the supporting plate G.
The wheel work of the apparatus shown in Figures 5 and 6 is located between
the parallel plates H and I and between the plate I and the bridges, H'H³ and H³
superposed (see Figure 6). The motor spring arranged in a spring barrel J, has
one of its ends secured to the latter and the other to a shaft 5 upon which there is
secured a wheel J. The teeth of the spring barrel J act upon the usual watch-
train formed of a train of wheels 6, 7, 8 and 9, and an escapement, 10, 11. The
shaft of one of the wheels 7 bears a pinion M. and the minute-hand m; the said
pinion M (Figures 6 and 9) acts upon the barrel wheel U bearing the hour-hand u,
which in the example chosen makes one revolution in 24 hours (see Figure 1).
This part of the wheel-work is thus intended to indicate the hour on the dial K
and works continuously.
The wheel J, which is secured on the shaft 5 of the barrel J, acts upon a train
which is composed of the three members 4, 3, 2, and of a butterfly-regulator 7.
The shaft of one member 4 of this train carries a wheel N which is intended to act,
by means of mechanism placed between the plate H and the bottom of the case L,
upon the lever F of the stopping device which has already been described. On
the other hand the butterfly regulator is alternately stopped and released by means
of a device shown in the Figures 7 and 8 and acted upon by means of the minute-
wheel of the wheel-work described above and shown in the Figures 9, 5 and 6,
and located between the plate I and the dial K.
The barrel-spring which is secured to the shaft 5 may be wound up in several
ways by means of a barrel j Figure 5 passing through the case L and bearing a
regulating pinion gearing into the wheel J. In order to allow the backward
rotation of the latter, which is involved by such winding up, the pinion n of the
member 4 which is intended to convey the rotation of the said wheel J' to the next
member 3 of the train is connected to the shaft 4 by means of a sliding pinion as
shown in Figure 6.

page_text: The driving mechanism of the plug, Figures 7 and 8, is composed of a cam
lever O a spring P, and a pin Q connecting the cam lever O to the valve operating
lever F.
The cam lever 0 is pivoted at o and connected at one end to the end of the
spring P which is fixed at its opposite end p so that the latter will cause it to
jump and assume either the one or the other of its extreme positions (indicated the
one in full lines and the other in dotted lines in Figure 7) without allowing it to
remain still in its medium position. The said cam lever O is provided with a
straight face o which is intended to be acted upon by means of one of the pins n
of a wheel N in order to bring the cam lever O from the position indicated in full
lines in Figure 7, into that indicated in dotted lines. The said cam lever O is
moreover provided with an inclined edge o² which is also intended to be acted upon
by means of one of the pins n of the said wheel N in order to bring the lever O,
from the position indicated in dotted lines, back into the position indicated in full
lines.
In the position of the lever O which is indicated in dotted lines in Figure 7 the
pin presses the free end of the lever F down and (consequently the pin f also)
which causes the valve E to be opened and the valve E to be closed; the burner C
is then lit.
In the position of the cam lever O which is indicated in full lines in Figure 7,
the said pin Q raises the free end of the lever F (and consequently the pin f) so as
to cause the upper valve E¹ to be closed and the lower valve E to be opened; the
burner C is then extinguished, but the pilot light which is supplied by means of
the tube D will still burn.
The stopping of the driving mechanism of the plug is effected by means of a
rocking-lever K, which is arranged with smooth friction in the plate I and which
is pivoted so as to move in a plane perpendicular to the latter. The rocking lever R
is provided with a hook r (Figure 9) which may be brought into the path of the
wings of the butterfly-regulator 1, in order to stop the mechanism, which is caused
by the action of the cam lever O by means of a bolt S which slides on the rocking
lever R. The tooths of the bolt S will always, by passing through an opening r
restore the said lever R to the stopping position indicated by dotted lines in
Figure 9 in whatever direction the bolt S is moved.
The displacement of the said bolt S is effected either in one direction or in the
other, by means of an arm 0¹ which is secured on the shaft of the cam lever O and
which acts upon projections s¹ and 2 of the bolt S. Consequently every time the
cam lever
jumps from the one into the other of its extreme positions in the
manner which has been described above the arm 0¹ will restore the rocking lever R
to the position in which it stops the train 4 3 2 1.
The inverse displacement of the rocking lever R, that is to say, the starting of
the said train, is effected by means of a spring T (Figure 9) which is lodged between
the barrel-wheel U and the plate I and which is further secured to the latter so as
to oscillate in a plane perpendicular to that of the said barrel wheel U. The
spring T presses the barrel-wheel U towards the dial K.
The barrel-wheel is pivoted on a pin u¹ which is secured to the said plate I,
and the said wheel is operated by means of a pinion M with the help of an inter-
mediate pin which is not shown in the drawing. Between the dial K and the barrel-
wheel U there are provided two discs V and W which are provided with barrels
which are concentric to that of the barrel-wheel U one carrying a hand and the
other a hand we which hands are intended to be placed, the one on the hour at which
it is desired that the apparatus should light the burner C, and the other on the
hour at which the latter is to be put out. The discs V and W are connected with
considerable friction to the dial K and thus they remain in the position in which
they were placed. Each of the said discs are provided with a tooth w¹ respec-
tively, against which, and at a determined hour, a projection u² of the barrel-wheel U
will stop. The latter is then raised by means of the tooth v¹ or w¹, and then
released again. The raising of the barrel-wheel U is conveyed to the spring T the

page_text: pint of which is then brought into the path of the butterfly I until the projec-
tion of the barrel wheel U escapes from the tooth of the disc V or from the
tooth w¹ of the disc W which caused the barrel wheel U to be raised.
A projection of the rocking lever R is raised together with the spring T and
removes the hook r from the path of the wings of the butterfly l. Considering the
slowness of motion of the barrel wheel U, the motion of the rocking lever R
might not take place at the predetermined hour, and so the pin t is intended to
keep back the mechanism, after the rocking lever R has been released, until the
exact moment when it is to work, and which is determined exactly by the pro-
jection escaping the teeth of the discs V or W. As soon as this escape takes
place the mechanism will work and cause the cam lever O to be moved out of
place by means of one of the pins n of wheel N, until, owing to the said lever O
jumping from its medium into its extreme position, the arm 01 acts upon the bolt S
and causes the butterfly 1 to be stopped in the manner which has been described
above.
The operation of the apparatus is as follows;
The spring of the barrel J being wound up drives in a continuous manner the
hands m and u indicating the hours and minutes on the dial K.
When the hand u arrives opposite one of the above mentioned hands v or opposite
the hand w, the projection u meets the projection v² or w¹ and the spring T which
is driven back by means of the barrel wheel U, brings its pin tinto the path of the
butterfly 7. At the same time the barrel wheel U drives back in its turn, the
tooth, and moves the hook r of the said lever R out of reach of the butterfly 1,
the pint of the spring T keeping the latter still during a lapse of time which will
be determined by the breadth of the projection or w¹. Then the projection u²
escapes from the latter and the mechanism being acted upon by the motor spring
starts and causes the cam lever O to jump thus acting upon the valve EE either
in one direction or in the other. The moment the cam lever O reaches the end of
its stroke, its arm (1 strikes the pin s¹ or s² and causes the bolt S to be displaced
either in one direction or in the other, which will, in both cases, restore the rocking
lever R to the position in which its hook r stops the butterfly 7.
The mechanism which is driven by means of the wheel J¹ is then stopped again
until the hand of the clock work reaches again one of the hands v or w.
Instead of the pilot-light, provided in the apparatus which has been described,
some other lighting-device may be used for instance a box D¹ (Figure 1) con-
taining spongy platinum which becomes incandescent by mere contact with the
gas. In this case gas need be conveyed to the tube D only during a very short
time and not during the whole time the burner C is extinguished.
Figure 10 shows a modification of the device for cutting off the light shown in
Figure 3. This modification simply consists in causing the pilot tube D to end
below the seat of the lower valve fi instead of having its end above the same, as
seen in Figure 3. In Figure 10 the valve E¹ is closed. When the lever F pulls
the rod f downwards, the upper valve El remains closed during the first part of
such motion until the screw e reaches the end of the recess in the valve stem in
which it is engaged.
During that time the conical part f¹ of the lower valve leaves its seat, and gas is
allowed to pass from the hole a into the pilot tube D, as long as the valve E does
not reach its seat a3 and, during that time the rod f fits in the screw cap a² tightly
enough as to cause the gas to enter the said pilot tube D instead of escaping
outside; when the downward motion of the valve is completed, that is to say when
the lower valve E engages with its seat a³, gas is no longer admitted to D. The
admission of gas to the pilot tube D is thus prevented by means of the conical
part f when the upper valve El is closed (as in the position of the parts shown in
Figure 10), and by means of the taper part E when the said upper valve E¹ is open.
Figure 10 further shows a lighting-device intended to be used instead of spongy
platinum and which may be combined with the arrangement of the double seat
valve which has just been described with regard to the said figure. Such arrange-
ment is composed of a series of holes d which are provided in the pilot tube D and

page_text: which constitute a row of gas jets which work as such only during the very short
time during which neither of the conical parts for E are acting to prevent the
gas from reaching the pilot tube 1). Said jets may be combined with some kind
of lighting-device acted upon by means of the lever F. In Figure 10 such device
may be composed of a disc X' carrying matches and of a spring rubbing-plate Y
against which the matches are successively lit when the disc X is rotated. This
rotation is effected by means of a suitable gear which is acted upon by means of the
lever F. The row of gas jets is of course extended as far as the burner C.
In order to avoid the inconveniences which might result from the heat of the
sun when this apparatus is placed in a street-lamp, the apparatus can be surrounded
with a case X of felt or other non-conductor of heat as indicated in dotted lines in
the Figures 3 and 4.
For the same purpose the studs or distance pieces connecting the wheel-work
with the plate G may further be arranged as shown in Figure 4, so as to reduce to
a minimum the contact faces between the supporting plate G and the mechanism.
The spacer, between the supporting plate G and the box I may also be provided
with felt or some other non-conductor of heat.
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. An apparatus for lighting and extinguishing gas jets provided with auto-
matic device for effecting such lighting and extinction at predeterminated hours,
characterized by the combination of a wheel work with a device for cutting off the
light, and with a mechanism acting upon the latter at predetermined hours, sub-
stantially as shown and described.
2. In an apparatus of the kind specified in Claim 1, a double valve E E¹ with a
spiral spring and a pin f provided with a taper f¹ substantially as described, and
shown.
3. In an apparatus of the kind specified in Claim 1, a wheel-work the driving-
spring of which acts, on the one hand, upon a train intended to indicate the hour
and on the other hand, upon a train intended to work the device for cutting off
the light substantially as shown and described.
4. In an apparatus of the kind specified in Claim 1, the combination of a wheel N
provided with pins n, with a lever O, a spring P, a pin Q and a lever F acting
upon the device for cutting off the light, substantially as shown and described.
5. In an apparatus of the kind specified in Claim 1, a stopping- and starting-
device composed of a lever R and of a bolt S, the latter being acted upon by means
of the lever for stopping the butterfly 7, the lever R being combined with a
barrel-wheel U and with discs V and Wintended to release the said butterfly 7 at
predetermined hours substantially as shown and described.
6. In an apparatus of the kind specified in Claim 1, a device intended to heat the
whole apparatus so as to prevent the oil used for lubricating the mechanism from
freezing, substantially as shown and described.
7. In an apparatus of the kind specified in Claim 1, a case which is formed of a
non-conductor of heat and which is intended to protect the mechanism against the
action of the sun, substantially as shown and described.
8. In an apparatus of the kind specified in Claim 1, the combination of a light-
ing-tube with a box D¹ containing spongy platinum, substantially as shown and
described.
9. In an apparatus of the kind specified in Claims 1 and 8, the lighting-tube
provided with holes d forming a row of gas reaching from some kind of mechanical
lighting device acted upon by means of the lever F, to the burner C, substantially
as shown and described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.