IMPROVEMENTS IN ELECTRICAL APPARATUS FOR LIGHTING GAS AND OTHER BURNERS
Year: 1872

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine,
Lake, & Co., Patent Agents, Southampton Buildings, London, for
the Invention of "IMPROVEMENTS IN ELECTRICAL APPARATUS FOR LIGHTING
GAS AND OTHER BURNERS."-A communication from abroad by Jacob
Porter Tirrell, of Charlestown, and John Ware Fletcher, and
William Clark Cutler, of Chelsea, all in Massachusetts, United
States of America.
Sealed the 25th February 1873, and dated the 30th August 1872.
PROVISIONAL SPECIFICATION left by the said William Robert Lake
at the Office of the Commissioners of Patents, with his Petition,
on the 30th August 1872.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co.,
Patent Agents, Southampton Buildings, London, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN ELECTRICAL APPARATUS
FOR LIGHTING GAS AND OTHER BURNERS," a communication, to be as
follows:-
This Invention relates to that class of electrical apparatus for lighting
lamps in which the current is successively thrown into the magnets at

page_text: all of the burners one after another; the circuit breaker is located at
the burner, and by the direct action of the current through the magnet
located at the burner the curcuit breaker and the valve for admitting
or turning off the gas are both operated, and the circuit after the
opening or closing of the valve at one burner is completed cut off
from the magnet of such burner and thrown into the magnet of the
next burner, and so on.
To the burner is secured a suitable platform on which is fixed
horizontally a U magnet. For this magnet is provided an armature
fastened to the lower end of an upright lever, turning upon a fulcum on
the burner and carrying at its upper end the circuit breaker. To hold
the armature from the magnet a spiral spring is applied to its carrying
lever. The location of the circuit breaker is such that by breaking the
circuit which causes the emission of a spark the plane or point of
emission is suitable for gas escaping from the burner to come in
contact with the spark.
The circuit breaker when not in motion rests with its spark emitting
end against a platinum arm of a fixed post that is in electrical com-
munication with the earth; the said post is located at one side of the
gas burner.
With the circuit breaker in contact with the platinum
arm the armature is off the magnet.
The magnet is connected to the circuit breaker and also to the
electric battery, the connection with the battery being made in the
ordinary manner for being established and broken at pleasure.
By establishing the connection between battery and magnet the
circuit is obviously complete, causing the magnet to attract the arma-
ture, which moving toward the magnet carries the circuit breaker away
from the platinum arm, breaking the circuit and emitting a spark.
The circuit thus being broken the attraction of the magnet ceases, and
by the spiral spring applied to the lever carrying armature the armature
is forced back to its normal position, when if the connection with the
battery is still unbroken the circuit through the magnet is again com-
plete, the parts again operate as above described, and so on as long as
the connection with the battery is unbroken.
By this swinging of the armature lever the stop-cock of the gas
50 21

page_text: be; the mechanism employed consists of a ratchet wheel on the spindle
of the stop-cock or valve and a spring pawl upon the armature lever
suitably arranged to turn the stop-cock in the movement of the said
armature lever toward the magnet only. In addition to the ratchet
wheel on the stop-cock spindle there are two similar sector shaped dics,
the periphery of both being of the same diameter and of an equal
length, the two peripheries making a complete circle. These sector discs
are fastened to the valve or stop-cock spindle one behind the other with
a space between them, and their position relative to each other is such
that were they in the same transverse plane of the stop-cock spindle
they would form a disc of a continuous periphery.
For each sector disc a similar lever arm is provided, the two levers
turning on a fixed fulcrum point of the gas burner; these lever arms
are so arranged that their upper ends can bear upon the edge of the
sector discs one to each sector; springs are suitably applied to the levers
to hold them against the sectors, and when one lever is on its sector
edge the other lever is off of its sector edge; these sectors are carried
around by the turning of the stop-cock and thus obviously there will be
a rest of the levers against the edge of the sectors, the one lever on its
sector edge with the other off, and then the second lever on its sector
edge with the first lever off, and so on; the said levers pass on and off
alternately and there is always one on when the other is off, and the
levers as they pass on and off turn upon their centres or fulcrums.
Each sector lever at its lower end has a finger piece, and these finger
pieces project from the levers, and each lies in and between pins. The
several pins are in a common insulator block located in the proper
position upon the gas burner, the two pins of each set being one above.
the other, with the upper ones of the two sets disconnected and the
lower ones connected or continuous.
In describing the operation of the circuit breaker it was stated that
the magnet is connected to the battery. In the arrangement of sectors,
levers, and pins above described, the connection of the magnet with the
battery in lieu of being direct is made through the said parts as follows:
-Each lever is connected through a separate wire with the electric
battery, and according to this Invention one wire is the letting on wire
for admitting the gas, and the other wire the shutting off wire, for
turning off the gas.

page_text: The lower pins are connected through a wire with the magnet. Thus,
with the finger piece of either of the sector levers in contact with the
lower pin and with a proper insulation of parts, there is a continuous
connection through the magnet, earth, and battery.
1
The two upper pins, which as before stated are disconnected, have
each of them a separate wire; both of these wires extend to another
burner having mechanism arranged as above described, and for this
second burner they are the letting on and turning off wires being con-.
nected to the sector levers. For a series of burners I repeat the same
system of connections.
When a sector lever bears on its sector the finger piece of such lever
is in contact with the lower one of the two pins provided for it, and
when a sector lever is off of its sector the finger piece of such lever is
in contact with the upper one of the two pins provided for it; as the
two levers are never on their sectors at the same time between them and
their pins, the one finger piece is on its lower pin, while the other finger
piece is on its upper pin, and vice versa.
Now, if the sector lever to which the letting on wire is connected is on
its sector, the other sector lever will be off of its sector, and the con-
nection between the battery and the letting on wire will be established
and an operation occurs as follows:-The armature is attracted from
time to time, the circuit broken and re-established, sparks are emitted,
and the valve spindle intermittently rotated.
To continue these effects I keep unbroken the connection with the
battery, and by the successive operation of the armature the gas cock
will be turned sufficiently for the sector lever on its sector to pass off,
and the other sector lever on its sector. This change in position of the
sector levers cuts off the magnet at the burner, carrying them from the
electric battery, and establishes the circuit with the magnet of the next
burner where the same operation of parts takes place, and so on to the
next, these effects being produced by the then relative position of the
sector levers on their respective pins. By the turning of the gas cock
the gas is turned on, and by the sparks ignited or lighted.
In the change of position of the sector levers it is apparent from the
above-described arrangement of the said levers and their pins, that.
through the sector lever then on the lower pin the shutting off wire

page_text: connected to such sector lever is then in connection with the magnet,
so that if the connection between the electric battery and letting on
wire is broken, and the connection between the electric battery and
shutting off wire established, the shutting off of the gas can be accom-
plished; this operation when completed throws the letting on wire into
connection with the magnet, and breaks the connection between the
magnet and shutting off wire, the current through the shutting off wire
continues to the next burner, and so on through the series, as in the case
of the letting on wire.
.
The mechanism above decoribed is to be pronarly insulated to nail-
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Robert Lake in the Great Seal Patent
Office on the 28th February 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of August, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Robert Lake, Her special
licence that I, the said William Robert Lake, my executors, adminis-
trators, and assigns, or such others as I, the said William Robert
Lake, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might
make, use, exercise; and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN ELECTRICAL APPARATUS FOR LIGHTING GAS AND OTHER
BURNERS," a communication to me from abroad by Jacob Porter Tirrell,
of Charlestown, and John Ware Fletcher, and William Clark Cutler, of
Chelsea, all in Massachusetts, United States of America, upon the
condition (amongst others) that I, the said William Robert Lake, my

page_text: executors or administrators, by an instrument in writing under my,
or their, or one of their hands and seals, should particularly describe
and ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Robert Lake, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the accom-
panying Drawing forming a part of this Specification :-
This Invention relates to electrical apparatus more especially intended
for lighting gas burners in streets or highways, but it is applicable to
lighting gas burners located in buildings, and in some points also to
lighting other mediums employed for the purposes of illumination or
otherwise.
The said Invention particularly relates to that class of electrical
apparatus for lighting burners in which the electrical current for
emitting a spark or sparks to ignite the gas or other illuminating
medium (or when the apparatus is employed with gas burners for
turning on or off the gas) is thrown into the electro-magnet at each
burner successively, one after another, acting only at or in one burner
at a time, and it will be described herein in connection therewith,
although as will be obvious it is more or less applicable to other classes
of electrical lighting apparatus.
"
Under this Invention as a whole, one electrical current is necessary
to secure both the emission of an electrical spark and the turning on
or shutting off, as the case may be, of the gas or other illuminating
medium, and the said Invention consists :-
First, in mechanism at a burner arranged to receive its action from
the attraction of an electro-magnet located at the burner, through which
magnet a current of induction passes, and when so actuated not only to
open or close as the case may be, and to both open and close a cock or
valve of the feed pipe to the burner, with a step by step motion or
otherwise, but automatically through such motion to break the circuit
at each step, the attraction of the electro-magnet is thereby destroyed,

page_text: and as a consequence the said mechanism by which the cock or valve is
operated is left free to resume by the impulse of a spring or other
equivalent means suitably applied its normal position; having reached
this position, or nearly so, it again establishes or closes the electrical
current, when attraction again takes place, and the same operation is
repeated, and so on as long as the current may be maintained or allowed
to enter or pass into the said electro-magnet.
Secondly, in an electro-magnet located at a burner, through which
magnet a current of induction is passed, and an armature that through
its movement toward the magnet, when attracted by the magnet
automatically of itself or of parts connected to it, not only breaks the
circuit, thereby emitting an electric spark at the point of rupture, but
after each rupture resumes its normal position, re-establishing or
closing the circuit; it is then again attracted by the magnet and as
before breaks the circuit, emits a spark, and resumes its normal position,
and so on as long as the current may be maintained or allowed to enter
the said electro-magnet; the rupture of the circuit under this part of the
said Invention is at or near the burning point of the burner so as
thereby to ignite the gas or other illuminating medium at the same.
Thirdly, in mechanism arranged at a burner to receive its action from
the attraction of an electro-magnet (through which a current of induction
is passed) located at the burner, and when so actuated not only to open
or close or both open and close the feed pipe to the burner, but through
such action to automatically rupture the oircuit, and thus to emit a
spark with the point of emission of such spark at or near the burning
plane of the burner, the said mechanism being otherwise arranged as
and in accordance with the first part of this Invention.
In addition to the above, the said Invention consists in many
important improvements in the details of construction of the separate
parts employed, and in their arrangement one with another, to secure
the effects or results above recited, and to secure the lighting or
extinguishing of a series of burners one after another succesively, as
will be herein-after most specifically described.

page_text: Figure 3 is a horizontal section on the line x, x, Figure 1, and a plan
of the portion below such line.
Figures 4 and 5 represent details herein-after referred to.
Figure 6 is a side view showing a modification in the construction and
arrangement of certain parts herein-after specified; and Figure 7 is a
partial horizontal section and plan of the same parts.
A is a gas burner, to which B is the feed pipe, provided with two
horizontal platforms C and D for carrying the apparatus of this In-
vention. E is a U magnet, horizontally located and secured on the lower
platform C, with the pipe B in and between the legs F of the magnet.
G is the armature properly located with regard to the magnet E, and
secured to the lower end of an upright lever H, turning upon a fulcrum
at I of the feed pipe B. J is the circuit breaker, secured in the upper
end of the lever H and projecting upward to the plane of the escape of
the gas from the burner. K is a post in upper platform D, and in elec-
trical connection with the earth. At the upper end of the post K is a
horizontal platinum arm 6 against which rests the point a of the circuit
breaker J when the lever H is at rest. L is a spiral spring applied to
the lever H to throw back the armature G from the magnet E.
O is an upright arm. This arm O has an angular spring band d firmly
fastened to its lower end, and this band in turn is fastened by a set screw e
to an insulator block c fixed to platform C. The upper end of this
arm O is in a position to bear on the periphery of the sector wheel f
fixed to the spindle or plug 9 of the valve or stop-cock in the feed
pipe B, and by its spring band d it is held against the concentric peri-
phery of the said sector wheel when such portion is in position therefor,
and forced toward the centre of the sector wheel when the concentric
portion or sector proper has passed by or beyond its upper end. The
arm O at P between its two ends is insulated. is a finger piece in
three sections, secured to and projecting horizontally from the lower end
of the arm O. This finger piece h at its outer end lies in a position
between the two parallel horizontal pins and m, the pin / being the
lower and the pin m the upper one. The lower pin enters the block c
at one side, and at the opposite side of the said block is similarly located
and entered another. pin 1, the two not meeting in the block but pro-
jecting above its upper face. The upper pin m, by a bent holder or
carrier arm i, is secured in position to the block c directly above the

page_text: lower pin 7, with a space between them, and this upper pin m is extended
continuously over the lower pin P, with a space between them, the said
extension being lettered m² and making as it were a distinct pin.
Q is an arm
constructed, arranged, and secured to the block c
like the arm O. This arm Q is in position to bear upon the periphery
of a sector wheel n fixed to the gas valve, spindle, or plug g, and for
its finger piece h³ to lie in and between the pins & and m² of the block c.
The sector wheel n is at the back of the sector wheel f. The two
sector wheels f and n are of equal diameter and of an equal length of arc,
that is, they form a half circle, the two together completing the circum-
ference.
The relative location of the sector wheels fand n on the valve spindle
is such that with the arm O on the periphery of its sector wheel f, the
arm Q will be off the periphery of its sector wheel n, and vice versa, and
the purpose of the said sector wheels is to swing their respective
arms O, Q, so as to bring about a bearing between their respective finger
pieces h, h², and the upper pins m, m³, respectively, and also to allow the
spring bands applied to and forming a part of the said arms O, Q, to
react and bring the finger pieces of the said arms respectively into
contact with the lowers pins l, . R is a ratchet wheel secured to the
gas valve spindle back of the inner sector wheel n, and S is a spring
pawl hung to lever H, and arranged from the movement of such lever to
act upon the ratchet wheel R to turn it in the direction of the arrow,
Figure 1. In lieu of a ratchet wheel a friction wheel and clutch may be
employed, such a one, for instance, as shewn in Figure 4.
M and N are wires leading from the electric battery employed. The
wire M is to let on, and the wire N to shut off the gas at the burner A.
The current is thrown into the one or the other of said wires by means
of a double switch, such as is employed ordinarily in electrical gas
lighting apparatus and other electrical apparatus, and therefore needs no
particular description herein. The wire M connects with the arm O, and
the wire N with the arm Q, each and both connections being made as
shewn.
T is a wire connecting the upper pins m, m², with the magnet E, and
U is a wire connecting magnet with circuit breaker J; V and W are
wires connected with lower pins and ², from which they are to lead to

page_text: the next burner, and to such burner become the letting on and turning
off wires as the wires M and N are to the burner A.
The position of the several parts composing the mechanism herein-
above described is at all times if at rest substantially that shewn in
Figure 1, and only differs therefrom in any condition of rest in the
relative positions of the two arms O, Q, according as one or the other is
bearing on its sector wheel for n. By the shewn positions of the two
arms O and Q the finger piece h of arm O is against the upper pin m,
and the finger piece h³ of arm Q against the lower pin of block c.
This relative contact with the pins l, l, m, m2, by the finger pieces to
the two arms is always maintained, they never being both at the same
time in contact with the lower pins 1, 2, or the upper pins m, m³, but
always the one with a lower pin, and the other with an upper pin
alternately.
With the arms O and Q in the relative positions described and shewn,
if a circuit of electricity should be thrown into the wire M (which as
stated is the letting on wire) it will pass into the magnet E (the con-
nection being through the lower portion of arm O, finger piece n, upper
pin, and wire T), thence to the circuit breaker I, which being in
contact with the platinum arm 6 forms, as is obvious, a complete :
circuit, the armature G will be drawn toward the magnet, turning its
lever H on its fulcrum, which carries the circuit breaker J beyond the
end of the platinum arm b, breaking thereby the circuit and emitting an
electric spark. This breaking of the circuit destroys the attractive force
of the magnet and leaves the lever H free to be pulled backward by its :
spring L; this backward movement of the lever completes the circuit by
bringing the circuit breaker into contact with the platinum arm 6 when
another attraction of the armature G occurs, again breaking the circuit,
emitting a spark and so on, as before.
By this alternate.forward and backward movement of the lever H, the
ratchet wheel R on the gas valve spindle is intermittently rotated,
carrying with it the valve spindle g and sector wheels f, n. If this
rotation of the valve spindle g be continued sufficiently, the periphery of
the sector wheelf will be carried beyond the arm O, leaving it free for
its spring band d to act, and thus to throw its finger piece h out of
contact with the upper pin m, and into contact with the lower pin l, and
the periphery of the sector wheel n will be brought to bear upon the

page_text: arm Q, throwing its finger piece * out of contact with the lower pin 1,
and into contact with the upper pin m³.
With the movement of the sector wheelf beyond its arm o, and of the
sector wheel n to its arm Q, as above described, results have been effected
as follows: First, the gas valve or stop-cock (its construction being
suitable therefor, as will be herein-after described) has been opened to
its fullest extent, and as at each stroke of the lever H caused. by the
successive attraction of the armature the circuit was broken and a spark
emitted, it is obvious the gas necessarily must have been lighted; second,
the current of electricity through the wire M is cut off from the mag-
net E and thrown into the wire V leading to the magnet of the next
burner, and which, as before stated, is the letting on wire to such
burner; third, a connection has been established between the magnet E
and the shutting off wire N, so that when it is desired to shut off the gas
from the burner A the operator has only to make the necessary con-
nection between the battery and shutting off wire. The connection
between the shutting off wire N and magnet is through arm Q, its finger
piece h³, pin m³, and wire T.
In shutting off the gas at the burner the operation of the parts is
precisely similar to the letting on of the gas, and therefore needs no
particular description herein, and on its completion the arm Q escapes
from its sector wheel n, and the arm O passes to its sector wheel f,
re-establishing the connection between the letting on wire and magnet
as before. Completing the shutting off of the gas at one burner throws the
current into the wire W leading from such burner A to the next burner,
which wire W to the said next burner is the shutting off wire.
The location of the circuit breaker at the gas burner is such that as it
breaks the circuit by escaping from the platinum wire b, the spark
emitted will be sufficiently near the escaping gas to ignite the same, and
it is desirable that the movement to let on the gas should be so divided
as to emit a sufficient number of sparks to insure the lighting of the gas.
The division of the letting on movement obviously is almost unlimited,
and it is accomplished by a relative construction of the ratchet wheel
and throw of the pawl. It is apparent that a decrease in the amount of
throw to the pawl at one time correspondingly increases the number of
successive movements of pawl necessary to rotate the plug or stop-cock
its full distance, and thus to bring about the changes of currents and
contacts of parts described, and that an increase in the amount of throw

page_text: to the pawl at one time correspondingly decreases the number of suc-
cessive movements of pawl necessary to rotate the plug or stop-cock its
full distance to produce effects as above stated.
In Figure 5 the stop-cock of the feed pipe is shewn sectionally in
detail. In ordinary gas cocks the passage for gas is diametrically through
it, so that a quarter turn of the cock turns the gas on or off, as the case
may be. This gas passage of the cock, however, under this Invention is
made of a T shape, as shewn, and in connection therewith a passage o is
formed, as shewn in the gas pipe B, supplementary to its ordinary
passage p, into which passage p at one end it enters, and at its other end
is in a position when the cock passage is, as shewn, Figure 5, view 1,
to be in communication with one end of the cross portion q to the T
cock passage, and thence through leg portion thereto with the burner.
From the above description of the construction of the gas passages of
the feed pipe and cock, and an inspection of Figure 5, it will be obvious
that in a complete turn of the cock for three of its four quarter divisions
of revolution, communication between feed pipe and burner is open, and
for one quarter division or line only closed. The location of the cock in
its seat with reference to the normal location of the sector wheels fand n,
and arms o and Q, is as shewn by view 1 of Figure 5. These views are
of the cock plug and its seat, and are made for the purpose of shewing
the position of the cock passage relative to the feed pipe passages at each
quarter turn of the cock, the cock being turned by the operation of the
apparatus in the direction of the arrow, Figure 1, that is to the left. In
view 1 the cock is closed, and in the views 2, 3, and 4, open. The
latter, or view 4, indicates the position of the end of the cock at the
end of three-quarters of its revolution. When making its revolution
complete, the cock comes to the position of view 1.
Applying these various positions of the cock passage in the order
given to the operation of the ratchet wheel, sector wheels fand n, and
arms O and Q, (said parts being in the normal position shewn), it will be
seen, first, that when the arm O escapes from its sector wheel as
described on a half turn of the valve spindle, the gas cock is open
(view 3) to the flow of gas to the burner, and in the course of each half
revolution, and at its first quarter turn it had been once before opened,
but closed for an instant, when it continues to open again, and so
continues to open until the completion of the half revolution, when it is
fully open as stated; secondly, that when the arm Q escapes from its

page_text: sector wheel as described on a half turn of the valve spindle, making
with the half turn first referred to a complete turn, the gas cock is closed
to the flow of the gas to the burner, and in the course of such half turn
the gas passage has been closed and then immediately opened again
(view 4), but finally fully closed as shewn (view 1).
From the above description of this improved electrical apparatus for
lighting burners, it will be obvious that the actuating current is auto-
matically broken; that the apparatus works automatically; that no
movement of the switch is necessary except to place it in the circuit of
either the turn on or shut off wire as the case may be; that from the
primary current sparks are emitted; that only one current is used to
either turn on or shut off, as the case may be, the gas and to light the
same; that the movement of all the parts is positive; that a battery of
small power may be used even with a circuit of a great number of
burners as the full action of the current is secured at each burner in
turn or succession; that the lighting of the gas is ensured almost beyond
the possibility of a doubt; that the current cannot pass from one burner
until its action at such burner is completed; that with the last burner
of a circuit of burners located in the office of the operator, or in view
or in a convenient distance of the operator, the said burner is a
monitor or tell-tale, indicating the completion or non-completion of
electrical labor in that circuit of burners; and that the magnet at each
burner is automatically switched out of the circuit in action by the
completion of the action of the circuit in each burner successively.
Although the present Invention has been herein described in con-
nection with the lighting of gas burners, it is obvious that it is sus-
ceptible of use readily and without difficulty to the lighting of gases of
various kinds, and to the lighting of oils and other illuminating
mediums, and therefore it is not intended to limit the said Invention to
its use for the lighting of any particular medium of illumination, nor to
the use of all of the several parts of the Invention combined in one
apparatus, for it is subject to division in its essential principles of
emitting sparks, and of actuating mechanism, as each works indepen-
dently of the other, and in some applications of the Invention the use of
one or of the other of its divisions aforesaid will be all that is required.
It may be well to here observe that in the construction of the
apparatus herein described the switching arms O and Q in lieu of being

page_text: hung to the insulator block O through the spring band d, may be hung
as shewn in Figures 6 and 7, that is to say, they may turn on a centre,
and a bent spring may be applied in a suitable position to bear the arms
against their respective sector wheels.
Having thus fully described the said Invention as communicated to
me by my foreign correspondent, and the manner of performing the
same, I wish it understood that I claim,-
First. The combination with a burner of an electro-magnet and an
armature which carries the circuit breaker and is otherwise constructed,
disposed, and arranged to turn the gas on and off, and to automatically
break and establish the circuit as herein described.
Second. The combination with a burner of an electro-magnet and an
armature which carries the circuit breaker to automatically establish and
break the circuit, and has the circuit breaker so located as to emit its
spark at the burning point of the burner as herein described.
Third. The combination in one apparatus of all the features of the two
preceding claims, substantially as described.
Fourth. The arms O, Q, sector wheels f, n, pins l, l³, m, m³,
wires M, N, magnet E, lever H, carrying armature. G, circuit breaker J,
pawl S and ratchet wheel R, all combined, arranged, and applied to a
burner for operation, as and for the purpose set forth.
In witness whereof, I, the said William Robert Lake, have here-
unto set my hand and seal, this Twenty-eighth day of February,
in the year of our Lord One thousand eight hundred and seventy-
three.
Witness,
JAMES EDWARDS,
8, Southampton Buildings,
London.
W. ROBT. LAKE. (L.S.)