Year: 1886

page_text: I, JOHANN HEINRICH WÜSTER, of the Firm of Brüder Wüster (Wüster Brothers)
of Ybbs, Lower Austria, Tool Manufacturers do hereby declare the nature of the
said invention to be as follows:-
My Invention has for its object to provide means for automatically lighting,
extinguishing and regulating with the aid of changes in the pressure of the gas,
gas lamps of any kind and more especially gas lamps used for the purpose of
lighting streets.
The Invention comprises three main parts, namely―
1st. A valve by which the gas conduit to the burner is opened and cut off.
2nd. A regulator of the gas pressure by which the rate of gas fed to the flame
is maintained constant notwithstanding the changes in the pressure of the gas.
3rd. A little gas flame, constantly burning near and under the 'burner proper
and kindling the gas which periodically emanates from said burner.
In the annexed sheet of Drawings Figure 1 is a sectional elevation of an
apparatus embodying the Invention. Figure 2 is a horizontal section of the same
on line Figure 1. Figure 3 is a horizontal section on line y y¹ Figure 1.
Figure 4 is a sectional elevation of a modified forin of the valve by which the
communication between the gas conduit and burner is made, or cut off. The
other figures show the most important details of the Invention to be hereinafter
fully described.
A Figure 1 is a cup valve which rises or falls under the action of the varying
pressure of the gas, and thereby allows the gas to flow into the burner C or cuts it
off from the same. B is the cup valve by which the pressure under which the
gas enters the burner is controlled D is the small flame by which the gas is
kindled as soon as it issues from the burner C.
By means of the casing, or box E the apparatus is screwed to the top end of the
gas pipe of the lantern. The gas flows into the inner hollow space of the box E
and rising through the pipe e and channel e¹ it gets directly to the small flame D
while the bore a gives it ingress into the apparatus proper. From the bore a the
gas flows through the apertures a¹ a² and through the tube a³ into the cup valve A
which is made of thin sheet iron protected from oxydation by any suitable means,
Price 11/1

page_text: The lower edge of said cup constantly submerges in mercury, whereby the hollow
space of the cup is tightly closed against the outer air. To the centre of the top
side of the cup is secured a nut a by means of which a rod A¹, screwed into said
nut a is rigidly connected to the cup A. The rod A¹ serves to guide the cup
valve A and is guided itself by two guide bushes as a The rod A¹ and the two
guide bushes as as are preferably made of nickel.
To a convenient point of the top side of the cup valve A is rigidly secured by a
tight joint, a downward extending tube A2, the lower edge of which dips into
mercury. The tube A' is by far shorter than the cylindric walls of the cup A and
it encloses a tube e² which is tightly screwed by its lower end, into the cast iron
box, or casing E.
The tube e is connected to the channel e³ and this latter communicates, by
means of the apertures 61 62 and the tube 68 with the inner hollow space of the
regulating bell B. This bell, or cup is also made of thin sheet iron and is guided
by means of a rod B¹ moveable in guide bushes 65 66 The rod B¹ and the guide
bushes b 66 are preferably made of nickel.
The lower edge of the regulating bell B constantly submerges in mercury and
the inner hollow space of said bell communicates by means of the vertical bore c¹
and the horizontal bore e5 (see Figure 2) with the inner hollow space of a tube E
arranged between the bells A and B and having its bottom end tightly screwed
into the cast iron valve box E. As soon as the gas has reached the tube E¹ it is
free to stream forth through the burner C which communicates with the tube E¹
by means of bores e and c.
The function of the apparatus is as follows. The gas entering the box E in the
direction indicated by the arrow a Figure 1 is always free to get into the inner
hollow of the cup A, in consequence whereof a certain additional pressure is
always acting upon the inner surface of the top side of the cup valve A, this
pressure tending to lift the valve. As soon as the pressure of the gas, which can
be varied at pleasure in the gas works, attains a certain height, it causes the cup A
to rise whereby the lower edge of the tube A is lifted above the level of the
mercury and the gas allowed to pass into the regulating bell in the B direction
indicated by the arrows BB viz through the tube e³, the bore e³, the aperture 6¹
tube 63 and aperture 6².
The regulator acts in the following manner. The bell B is guided by the rod B¹
with very little friction and the lower end of the said rod B¹ is connected by
means of a ball joint to a conical valve b. Now, when the gas arrives through the
bore e under a high pressure it will lift the ball B and in consequence thereof the
conical valve b will throttle the gas conduit to the bell B. As soon as, in con-
sequence of this narrowing of the gas way, the pressure inside the bell B lowers
under the desired point, said bell sinks down again, the valve b increases the ring
shaped passage, and thus the pressure inside the bell B is allowed to grow higher
⚫anew. In this manner the alternate widening and narrowing of the gas way to
the bell B according to the higher, or lower pressure under which the gas arrives
through the passage e³ results into a nearly constant pressure inside the bell B and
as the inner hollow space of said bell B directly communicates with the burner C
by means of the bores e¹ e the tube E¹ and the bores e6 and c an unvariable rate of
feed of the gas to the flame will be established. The height of the pressure under
which the gas is desired to emanate from the burner is controlled by accordingly
weighting the bell B. When the load of the bell is increased, the pressure of
emanation at C enhances, and when the load is diminished the said pressure falls.
As before stated, the cup valve A is caused to rise by an increase of the pressure
of the gas. The load by which said valve is to be prevented from rising before
the pressure has attained a certain height may consist in weights such as are
shown on the regulating bell B, or in a coiled spring. This spring surrounds the
bottom end of the rod A¹ and its pressure can be adjusted by means of a nut a².
The most important feature of the Invention lies in the following device. As it
is necessary to prevent the cup valve A when it has risen and thereby has lifted

page_text: the lower edge of the tube A³ above the level of the mercury to connect the
burner C to the gas main from sinking down again under the action of a subse-
quent decrease of pressure a tube F freely surrounding the rod A¹ is inserted
between the guide bushes a³ and a In order to enable the tube F to turn
between the bushes as a with less friction both ends of said tube have their edges
bent inward as shown. The said tube F is provided in its middle portion with
recesses through which project both ends of a pin a³ fixed crosswise to the rod A¹².
Figure 6 shows the said recesses f on a larger scale; in this Figure the portion of
the sides of the tube F to be cut out is indicated by hatchings. The recesses fare
so arranged that to each recess of a certain form and length situated in one side of
the walls of the tube corresponds a diametrically opposite recess of exactly the
same form and length. As by these recesses occupying the whole circumference of
the tube F the said tube is separated into two portions, said portions need to be
connected by means of bows f¹ f¹ soldered to them.
The object and function of the recesses fis as follows. In Figure 6 1 represents
the cross pin as having its undermost position to which answers the position of
the cup valve A shown in Figure 1. When the cup rises the cross pin a³ moves in
the direction indicated by the arrow Figure 6. and as the tube F is free to turn
round its axis the said pin will, by turning the tube F get in the position 2. After
when the pressure of the gas lowers, the cup valve A descends and the pin a
moving vertically downward and again turning the tube F will take the position 3
and thus be prevented from moving farther down. As the lower edge of the
tube A by which the communication is made and cut off makes excursions of the
same length as the cross pin as the said edge cannot be dipped into the mercury
again, for the cup valve A is kept in a raised position by the cross pina³ to
whatsoever a point the pressure of the gas may decrease.
When the lower edge of the tube A³ shall be immerged again into the mercury
for intercepting the gas supply to the burner C the pressure of the gas ought to be
sufficiently enhanced for raising the cup valve A another time. Then the cross
pin a moves vertically upward from its late position 3 whereby it turns again the
tube F a small angle and is stopped when arriving in the position 4.
following decrease of the pressure of the gas, the cross pin a³ is caused to assume in
an analogous manner its lowermost position 5 and in the same time the under edge
of the tube A is immersed in the mercury.
At a
If it be intended to light all street lamps of a town by one increase of gas
pressure and to extinguishing them by a second 'increase the tube F is provided
with four recesses, or slots f viz: two diametrically opposed longer ones and two
diametrically opposed shorter ones. In this case the tube F will make a half
revolution round its axis every time the lamps are lighted and extinguished, and
after two subsequent lighting and extinguishing operations the cross pin a³ will
have caused the tube F to make a whole revolution and will have given this tube
its initial position.
It will be observed that a great number of different combinations may be formed
according to this method. Thus for instance, if a valve be desired which closes the
gas conduit on three elevations and lowerings of the pressure, the recesses f of the
tube F should be formed as shown in Figure 7. In this case the cross pin a³ can
assume seven different positions; after the first increase and subsequent decrease of
pressure the said pin advances from the position 1 to the position 3 while the
second increase and decrease causes it to pass from 3 to 5 and a third analogous
action brings the pin into its lowermost position 7.
Figure 8 shows another combination of recesses f, which in certain cases may be
used to advantage. In the above Specification and in Figure 1 it has been
supposed that the rod A¹ and cross pin a move up and down, while the tube F is
prevented from moving endwise and only allowed to turn round its axis. Obviously
the same effect would be produced by a fixed rod A¹ and cross pin a³ in combi-
nation with a tube F jointed to the cup valve A so as to be free to turn round its
axis. In some cases the tube F may be made immoveable and the rod A¹ jointed

page_text: to the cup valve A by means of a joint F¹ Figure 5 which admits of the rou A
turning with very little friction.
In Figure 1 the passage through which the gas enters the cup valve A is arranged
beneath the centre of said valve. It is a drawback of this arrangement that the
moveable parts of the apparatus constantly are in contact with the gas. To avoid'
this contact, the arrangement shown by Figure 4 may be used. In this Figure A
is the cup valve the cylindric walls of which plunge into mercury. A' is the rod
by which the valve is guided. a³ and a are the guide bushes of the said rod, these
bushes being conveniently secured within the tube a³. The gas conveyed through
the bore a gets into the inner space of the cup valve A through a special eccentric
bore a. To the centre of the inner surface of the top side of the cup A is slightly
secured a downward extending tube A³, which like the cylindric walls of the cup A,
plunges by its under edge into mercury and thus forms a gas tight partition
between the hollow space of the cup A and the tube A³; this latter communicating
The mechanism heretofore
with the outer air by means of a small aperture o.
described referring to Figures 5. 6 7 and 8 may be arranged between the guide
bushes a and a, or round the lowermost portion of the rod A¹.
As in some cases it may be desirable to surely prevent the cross pin a³ when it
has passed by its rising and turning the tube F from a lower recess f into an upper
one, from re entering, while descending the recess it has started from, switches may
be used, made of very flexible springs f* as shown by dotted lines in Figure 8, said
switches allowing the cross pin a8 to pass from one guide way into the other in
only one direction viz: either while rising, or while descending and preventing it
from so doing in the other direction.
Finally it will be observed that the slots, or recesses f shown in Figures 6. 7 and 8
may be replaced by mere chased grooves, that is to say, the portion of the sides of
the tube F marked with hatchings in Figure 6 may be made embossed to the
outside.
The main characteristic feature of the described recesses f lies in the fact that
these recesses are confined by curves by which a pin moving up and down vertically
is surely and easily caused to pass from one recess into an adjacent one; this device
being used for controlling the throw of a cut off valve interposed in the gas conduit.
In some cases the arrangement shown by Figures 9 and 10 may be used. In
these Figures the top end of the rod A¹ is rigidly connected to the cup valve A
and a frame A is interposed between the top and bottom portions of the said
rod A¹. The ends of said portions of the rod A¹ screwed into the frame A are
formed into points between which a rod A¹ is moveably kept in place. Said move-
able rod A¹ carries the cross pin a8 and is surrounded by the recessed tube F which
is rigidly connected to the tube a³ by means of radial ribs ƒ³, or otherwise. With
this arrangement the rod, or pin A¹ will be rotated in consequence of the cross
pins as being guided by the recesses f.

page_text: 5)
аци
Regulating Gas Lamps.
I, JOHANN HEINRICH WÜSTER, of the Firm of Brüder Wüster (Wuster Brothers)
of Ybbs, Lower Austria, Tool Manufacturers, do hereby declare the nature of my
said 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 has for its object to provide means for automatically lighting,
extinguishing, and regulating, with the aid of changes in the pressure of the gas,
gas lamps of any kind and more especially gas lamps used for the purpose of
lighting streets.
The Invention comprises three main parts, namely
1st. A valve by which the gas conduit to the burner is opened and cut off.
2nd. A regulator of the gas pressure by which the rate of the feed of the gas to
the flame is maintained constant notwithstanding the changes in the pressure of
the gas.
3rd. A little gas flame constantly burning near and under the burner proper and
igniting the gas which periodically emanates from said burner.
In the annexed sheet of Drawings Fig. 1 is a sectional elevation of an apparatus
embodying the Invention; Fig. is a horizontal section of the same on line x x¹
Fig. 1; Figure 3 is a horizontal section on line y y¹ Fig. 1; Fig. 4 is a sectional
elevation of a modified form of the valve by which the communication between the
gas conduit and burner is made, or cut off. The other Figures show, the most
important details of the Invention to be hereinafter fully described.
À Fig. 1, is a cup valve which rises, or lowers under the action of the varying
pressure of the gas, and thereby allows the gas to flow into the burner C, or cuts
it off from the same. B is the cup valve by which the pressure under which the
gas enters the burner is controlled. D is the small flame by which the gas is
ignited as soon as it issues from the burner C.
By means of the casing, or box E the apparatus is screwed to the top end of the
gas pipe of the lantern. The gas flows into the inner hollow space of the box E
and rising through the pipe e and channel e¹, it gets directly to the small flame D
while the bore a gives it ingress into the apparatus proper. From the bore a the
gas flows through the apertures a¹ and a² and through the tube a³ into the cup
valve A which is made of thin sheet iron protected from oxidation by any suitable
means. The lower edge of said cup constantly dips into mercury, whereby the
hollow space of the cup is tightly closed against the outer air. To the centre of
the top side of the cup is secured a nut a by means of which a rod A¹ screwed
into said nut a¹ is rigidly connected to the cup A. The rod A¹ serves to guide the
cup valve A and is guided itself by two guide bearings a³ a. The rod A³ and the
two guide bearings a³ a are preferably made of nickel.
To a convenient point of the top side of the cup valve A is rigidly secured, by a
tight joint, a downward extending tube A2, the lower edge of which dips into
mercury. The tube A' is by far shorter than the cylindric walls of the cup A and

page_text: it encloses a tube e³ which is tightly screwed, by its lower end, into the cast iron
box, or casing E.
The tube e' is connected to the channel e³ and this latter communicates by
means of the apertures b¹ 6' and the tube b³ with the inner hollow space of the
regulating bell B. This bell, or cup too is made of thin sheet iron, and is guided
by means of a rod B¹ moveable in guide bearings 66 66. The rod B¹ and the guide
bearings 6 66 are preferably made of nickel.
The lower edge of the regulating bell B constantly dips into mercury and the
inner hollow space of said bell communicates by means of the vertical bore e¹ and
the horizontal bore e (see Fig. 2) with the inner hollow space of a tube E¹ arranged
between the bells A and B and having its bottom end tightly screwed into the iron
valve box E. As soon as the gas has reached the tube E it is free to stream forth
through the burner C which communicates with the tube E¹ by means of the
bores e and c.
The operation of the apparatus is as follows. The gas entering the box E in the
direction indicated by the arrow a Fig. 1 is always free to get into the inner
hollow of the cup A in consequence whereof a certain additional pressure is always
acting upon the inner surface of the top side of the cup valve A, this pressure
tending to lift the valve. As soon as the pressure of the gas, which can be varied
at pleasure in the gas works, attains a certain height, it causes the cup A to rise,
whereby the lower edge of the tube A2 is lifted above the level of the mercury and
the gas allowed to pass into the regulating bell B in the direction indicated by the
arrows B viz. through the tube e the bore e³, the aperture 6¹ tube 6³ and
aperture 6³.
The regulator acts in the following manner. The bell B is guided by the rod B¹
with very little friction and the lower end of said rod B' is connected by means of
a ball and socket joint to a conical valve b. Now when the gas arrives through
the bore e under a high pressure it will lift the bell B and in consequence thereof
the conical valve b will throttle the gas conduit to the bell B. As soon as in
consequence of this narrowing of the gas way, the pressure inside the bell B
lowers under the desired point, said bell sinks down again, the valve b increases
the ring shaped passage and thus, the pressure inside bell B is allowed to grow
higher anew. In this manner the alternate widening and narrowing of the gas
way to the bell B according to the higher, or lower pressure under which the gas
arrives through the passage es results into a nearly constant pressure inside the
bell B and as the inner hollow space of said bell B directly communicates with the
burner C by means of the bores e e³ the tube E¹ and the bores e and can
unvariable rate of feed of the gas to the flame will be established. The height of
the pressure under which the gas is desired to emanate from the burner is con-
trolled by accordingly weighting the bell B. When the load of the bell is increased,
the pressure of emanation at C enhances and when the load is diminished said
pressure falls.
As before stated the cup valve A is caused to rise by an increase of the pressure
of the gas. The load by which said valve is to be prevented from rising before
the pressure has attained a certain height, may consist in weights such as are
shown on the regulating bell B, or in a coiled spring; this spring surrounds the
bottom end of the rod A and its pressure can be adjusted by means of a nut a?.
The most important feature of the Invention lies in the following device. As it
is necessary to prevent the cup valve A when it has risen and thereby has lifted
the lower edge of the tube A above the level of the mercury, to connect the
burner C to the gas main, from sinking down again under the action of a subse-
quent decrease of pressure, a tube F freely surrounding the rod A¹ is inserted
between the guide bearings a³ and a. In order to enable the tube F to turn
between the bearings a³ a with less friction both ends of said tube have their
edges bent inward as shown. Said tube F is provided in its middle portion with
a zig zag slot, or guide way f through which project both ends, or one end only of
a pin a³ fixed crosswise to the rod A¹. Figs. 6. 7 and 8 show said slotted tubes F

page_text: on a larger scale. If both ends of the cross pin a³ are to project through the slot f
this zig zag slot is so arranged that to each branch of a certain form and length
situated in one side of the walls of the tube corresponds a diametrically opposite
branch of exactly the same form and length. In the case of one end only of pin a
projecting through the slot f the branches of identic form only ought to be equi
distant; so for instance Fig. 7 shows identically formed branches distant from each
other 120°. As by this slot occupying the whole circumference of the tube F said
tube is separated into two portions, said portions need to be connected by means
of bows f¹ f¹ soldered to them. As shown in the Drawings the bows f¹ have
their opposite ends preferably connected together by means of short tubes F³ into
which the halves of the slotted tube F are soldered.
.
The object and operation of the zig zag slot f is as follows: In Fig. 8,
1 represents the cross pin as having its undermost position, to which answers the
position of the cup valve A shown in Figure 1. When the cup rises the cross
pin a vertically moves in the direction indicated by the arrow in Figure 8, and
as the tube F is free to turn round its axis, said pin will, by impinging on the
inclined upper edge of the slot f turn the tube F and get in the position 2. After,
when the pressure of the gas lowers, the cup valve A descends and the pin a
moving vertically downward and again turning the tube F will take the position 3
and thus be prevented from moving farther down. As the lower edge of the
tube A by which the communication is made and cut off, makes excursions of the
same length as the cross pin a8 said edge cannot be dipped into the mercury again,
for the cup valve A is kept in a raised position by the cross pin as to whatsoever
a point the pressure of the gas may decrease.
When the lower edge of the tube A* shall be immerged again into the mercury
for intercepting the gas supply to the burner C, the pressure of the gas ought to
be sufficiently enhanced for raising the cup valve A another time. Then the cross
pin a³ moves vertically upward from its laté position 3 whereby it turns again the
tube F a small angle and is stopped when arriving at the end of an upward
extending branch similar to the branch 2. At a following decrease of the pressure
of the gas, the cross pin a8 is caused to assume in an analogous manner its
lowermost position, in a branch of the slot f diametrically opposite to the branch 1
and in the same time the under edge of the tube A³ is immersed into the mercury.
If it is intended to light all street lamps of a town by one temporary increase
of gas pressure and to extinguish them by a second temporary increase, the slot f
of the tube F is provided with four downward extending branches viz. two
diametrically opposite longer ones and two diametrically opposite shorter ones. In
this case the tube F will make a half revolution round its axis every time the
lamps are lighted and extinguished and after two subsequent lighting and
extinguishing operations the cross pin as will have caused the tube F to make a
whole revolution, and will have given this tube its initial position.
It will be observed that a great number of different combinations may be formed
according to this method. Thus for instance, if a valve be desired which closes the
gas conduit on three temporary elevations of the pressure, the slot f of the tube F
should be provided between each two longer downward extending branches with
three shorter downward extending branches.
In the above Specification and in Fig. 1 it has been supposed that the rod A and
cross pin a move up and down, while the tube F is prevented from moving
endwise and only allowed to turn round its axis. Obviously the same effect would
be produced by a fixed rod A¹ and cross pin a³ in combination with a tube F
jointed to the cup valve A so as to be free to turn round its axis; then the tube F
would do in the same time the office of a valve stein, and the zig zag slot ƒ would
have its branches of different length extending upward. In some cases the tube F
may be made immoveable and the rod A¹ jointed to the cup valve A by means of a
joint F Fig. 5 which admits of the rods A¹ turning with very little friction.
In Fig. I the passage through which the gas enters the cup valve A is arranged
beneath the centre of said valve. It is a drawback of this arrangement that the

page_text: controlling device of the valve constantly is in contact with the gas. To avoid,
this contact the arrangement shown by Fig. 4 may be used. In this Figure A is.
the cup valve the cylindric walls of which dip into mercury, A¹ is the rod, or valve
stem by which the valve is guided as and as are the guide bearings of the said rod,
these bearings being conveniently secured within the tube a³. The gas conveyed
through the bore a gets into the inner space of the cup valve A through a special
eccentric bore aº. To the centre of the inner surface of the top side of cup A is
tightly secured a downward extending tube As which like the cylindric walls of the
cup A plunges by its under edge into mercury and thus forms a gas tight partition
between the hollow space of the cup A and the tube a³; this latter communicating
with the outer air by means of a small aperture o. The mechanism heretofore
described referring to Figs. 5. 6. 7 and 8 may be arranged between the guide
bearings as and a or round the lowermost portion of the rod A¹. The tube A' is
not shown in Fig. 4 but it is obvious that it will be arranged in the manner shown
in Fig: 1.
As in some cases it may be desirable to surely prevent the cross pin as when it
has passed by its rising and turning the tube F from a downward extending
branch of the slot f into an upward extending one from re entering, while
descending the branch it has started from, switches may be used, made of very
flexible leaf springs f¹ as indicated by dots in Fig. 8; said switches allowing the
cross pin as to pass from one branch of the guide way into the other in only one
direction, viz. either while rising, or while descending, and preventing it from so
doing in the other direction.
Finally it will be observed that the slot f shown in Figs 6. 7 and 8 may be
replaced by a mere chased groove, that is to say the portion of the sides of the
tube F comprised between the outlines of the guideway may be made embossed
to the outside.
The main characteristic feature of the described slot f lies in the fact that this
slot is confined by curves by which a pin moving up and down vertically is surely
and easily caused to pass from one branch of the slot into an adjacent one; this
device being used for controlling the throw of a cut off valve interposed in the gas
conduit.
In some cases, the arrangement shown by Figs. 9 and 10 may be used. In these
figures the top end of the rod A¹ is rigidly connected to the cup valve A and a
frame A is interposed between the top and bottom portions of said rod A'. The
ends of said portions of the rod A¹, screwed into the frame A' are formed into
points between which a rod A¹ is rotatably kept in place. Said rotatable rod A¹
carries the cross pin a8 and is surrounded by the recessed tube F, which is rigidly
connected to the tube as by means of radial ribs f3 or otherwise. With this
arrangement, the rod, or pin A¹ will be rotated in consequence of the cross pins a³
being guided by the zig zag slot f.
It is obvious however that the pin as guided by the zig zag slot f must not
necessarily be fixed to a valve stem surrounded by the slotted tube F¹, said pin
may be fixed to the sides of the bell A. itself and may project into the zig zag
slot of a tube F free to turn in front of the pin next the cylindric wall of the
bell valve.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is =
1st. In an apparatus for lighting and extinguishing gas lamps from the gasometer
the combination with the gas burner of a small flame constantly burning near such
burner of a weighted bell valve provided with a mercury seal and forming by its
inner hollow space a part of the gas conduit from the gasometer to the burner, of
a valve rigidly secured to the inside of the bell and controlling the mouth of the
portion of conduit from the bell to the burner of a pin rigidly connected to said
bell and of a vertical tube free to turn round its axis but prevented from moving

page_text: endwise, said tube having formed in its sides a zig zag guideway for said pin with
longer and shorter branches and confined by outlines of such a form as to allow the
pin to advance in the guideway in one direction only, for the purpose of causing
said pin, after having on an elevation of gas pressure risen along a longer branch
of the guide way, to descend on a following reduction of pressure, into an adjacent
shorter branch, or vice versa.
2nd. The combination with the apparatus referred to in the 1st claim of a
weighted bell valve provided with a mercury seal and forming by its inner hollow
space a part of the gas conduit from the supply valve to the burner and of a valve
rigidly secured to the inside of said bell and adapted to throttle the mouth of the
portion of conduit from the supply valve to the bell, as soon as the bell is lifted by
gas pressure.
3rd. In the apparatus referred to in the 1st claim, the combination with the bell
valve of a fixed tube having a zig zag guide way formed in its sides and of a pin
projecting into said guide way and being secured to a part which is rotatably
connected to the bell valve.
4th. In the apparatus referred to in the 1st claim, the combination with the bell
valve of a tube rotatably connected to said valve and having a zig zag guide way
formed in its sides, and of a fixed pin projecting into said guidway.