AN IMPROVED ELECTRIC ARC LAMP
Year: 1884

page_text: CUMPLEIE
We HERBERT TROTT of 75 High St Battersea S. W. in the County of Surrey, and
CHARLES FREDERICK FENTON of River Bank Talbot Rd Richmond Rd Isleworth in
the County of Middlesex do hereby declare the nature of above Invention for
AN IMPROVED ELECTRIC ARC LAMP and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
'
This Invention relates to apparatus applied to are lamps for regulating the feed
of carbons, striking the arc and bringing a second pair of carbons into action upon
the first being consumed.
Figs. 1 and 2 shew the feed mechanism as applied to a lamp with a single pair
of carbons. Fig. 3 shows the mechanism as applied to a lamp with two or more
pair of carbons with a switch bolt and magnet for bringing a second pair of carbons
into action. Fig. 4 shews a step magnet for striking tho are in a lamp with two
carbons.
2
Firstly referring to Fig. 1 of the accompanying Drawings we place a double pole
regulating magnet A on the top of frame of lamp such magnet being wound with
main and shunt circuit wire, the shunt being laid in an opposite direction to the
main for the purpose of reducing its magnetism thus allowing lamp to feed.
The above magnet A has flat poles and such poles are bored out to admit of the
rotation of a wrought iron circular disc B therein, such disc forming the armature
to said magnet A and being mounted on the last spindle of a train of wheels H, the
first motion of which is in connection with the brass down rod and carbon holder C
the weight of which actuates the above wheelwork by drum D hereinafter
explained. The regulating magnet A Fig. 1 is fixed in such a manner to a bracket
on frame that it is capable of a centre swivelling motion accross the periphery of
armature disc B by moving the hand wheel F thus altering the amount of
attraction at will and allowing lamp to be adjusted with others in series whilst at
work. The fine wire on magnet A Fig. 1 is in connection with the solenoid E the
two being of considerable resistance the current to which is established by contact
of studs P by downward motion of armature to are striking magnet M.
Secondly on shunt current passing solenoid E the plunger belonging thereto
descends at the same time raising pad from periphery of armature disc B the duty
of said nad being to keep the train of wheels H in tension when main current is

page_text: interrupted. The third part of the Invention relates to a single pole regulating
swivel magnet A Fig. 2 wound with a portion of main circuit wire which pole
embraces an electric reel armature B laid in the same direction with a portion of
fine resistance wire with one revolving platinum connection to brush O an the
other to frame of lamp the said wire on reel B being in circuit with solenoid E
Fig. 1 causing pole of reel B Fig. 2 to assume the same polarity as the pole of
regulating magnet A by which it is embraced on the resistance of are increasing
thus allowing lamp to feed.
The fourth part of the Invention relates to the mode of connecting the vertical
and rotary motion between drum D and rod C in Fig. 1 and 3 this is carried out
by two thin plated metallic bands K one connected to top of down rod C and on to
drum D right handed, the other connected to bottom of rod C and on to irum D
left handed, such drum D having fine teeth round one edge and being free to move
on spindle G of wheelwork, such spindle having an arm I fixed close to drum D
with pawl L engaging in teeth of drum D when lamp is in action and running
over same when down rod C is raised to renow carbons.
The fifth part of the Invention consists in making one set of wheelwork H.
Regulating magnet A. and solenoid E govern two or more pair of carbons this end
being attained by lengthening spindle G of wheelwork H in Fig. 1 and placing the
required number of tapo drums D the same as applied in Fig. 3 the pawls L on
arms I disengaging themselves, on rods being raised.
The sixth part of the Invention consists in making one moveable lower rod N in
Figs. 1 and 4 act for two lower carbons by means of a pair of step magnets M 1
and 2, the armature P to magnet M 1 has a brass sleeve T fixed in centre of same,
such sleeve being free to slide on rod N but resting on bracket to armature S
attached to rod N.
On main current passing to lamp armature P is attracted by magnet M 1 drawing
down same with rod N and armature S and striking arc.
On consumption of first pair of carbons a switching device hereinafter
described causes second pair of carbons to meet thus short circuiting main current
and making magnet M 2 Fig. 4 attract its armature S attached to rod N thus
drawing down rod N and armature S a step lower and leaving armature P on
poles of magnet M1 rod N sliding through sleeve of armature P striking arc to
second pair of carbons.
The last part of the Invention consists in arranging switch magnet U Fig. 3
(one to each down rod C after the first) with armature V and spring bolt Z as
shewn, the said magnet V being of slightly less resistance than the solenoid E
Fig. 1 the result being that on consumption of carbons the pins X on the respective
down rods C make contact with pads Y and temporally short circuit resistance
solenoid E allowing shunt current to pass through switch magnet U and attraction
of armature V drawing spring bolt Z from down rod C and at the same time
breaking circuit of magnet U and allowing shunt current to return to solenoid E, a
ratchet falling in teeth of bolt Z and stopping its return till a pin on bottom of
rod C frees it at renewal of carbons.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed we declare that what
we claim is
1st A double pole regulating magnet A Fig. 1 with swivel motion and adjusting
wheel F which poles embrace a circular disc armature B in connection with
wheelwork H.
2nd A pad working on periphery of armature disc B in connection with solenoid E
Fig. 1 with electric circuit as shown.
3rd A single pole regulating swivel magnet A Fig. 2 which embraces an electric
reel armature B wound with a portion of shunt wire.
4th A drum D Fig. 3 in connection with spindle G by plated metallic bands K
fixed right and left handed. on drum D and to top and bottom of down rod C
respectively.

page_text: 5th Two or more upper carbons regulated by one set of wheelwork, differential
magnet and solenoid by lengthening spindle G Fig. 1 and arranging tape drums D
thereon as shown at Fig. 3.
6th Pair of step magnets M1 and 2 Fig. 4 for lamps with two or more carbons
with an armature P with slip sleeve T fixed to same resting on bracket to
armature S which bracket is attached to rod N, and with brass guide pins in poles
of magnets as shewn.
7th A spring bolt Z Fig. 3 actuated by switch magnet U on contact of pin X
and Y also a ratchet working into teeth on said bolt Z preventing its return till
the raising of rod C for the renewal of carbons frees it substantially as described in
Specification.