Year: 1898

page_text: We, WILLIAM JAMES DAVY and GEORGE THOMAS-DAVIES, Engineers, of Horsell
Road Works, Highbury, in the County of London, do hereby declare the nature of
this invention to be as follows:-
This invention for improvements in electric arc lamps relates to the controlling
bobbins, the idle resistance and the cut out.
The main frame of the lamp comprises a central tube that supports the mechanism.
The cores of the controlling bobbins are shaped, the bottom of the surrounding
the central tube of the lamp. The two limbs of the series core descend into their
coils and the shunt core is inverted, the two limbs ascending into their coils when
in notion to feed. The two cores are suspended from a disc having a boss sliding
on the central tube of the lamp. The disc is, connected by a flexible cord passing
over pulleys near the top of the central tube to the cylinder of the dash pot having
a fixed piston and connected by a controlling tube passing down the central tube to
the arc controlling mechanism. The pulleys are mounted between plates passed
through a rectangular holo in the central tube.
The idle resistance is arranged between a dome shaped cap at the top of the
central tube and an inner dome that is forced upwards against the dome cap by a
nut screwing on the boss of the cap. The two terminals of the lamp and the fuse
terminals are fixed on insulating strips on the under surface of the inner dome.
The cut out coil, and core are supported upon the terminal of the lamp upon the
body or chamber containing the mechanism. The core is insulated and the armature
is supported in an arm pivotted to the central tube and working between stops.
The circuit is so arranged that the terminal on the body of the lamp is, say, the
negative and the body itself the positive. The ☐ shaped core is wound with a
conductor insulated from it except at one end, the other end being connected to the
negative terminal.
The armature closes the circuit when it touches the poles of the core, and the
shunt core of the lamp lifts the armature up to the poles.
In an alternating lamp a choking or impedance coil is substituted for the
resistance and the shunt coil is wound to suit the frequency.
A damper plate is fixed to the lower end of the controlling tube within the
chamber containing the regulating mechanism.
Dated this 3rd day of January 1898.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.

page_text: We, WILLIAM JAMES DAVY and GEORGE THOMAS-DAVIES, Engineers, of Horsell
Road Works, Highbury, in the County of London, 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 :-
This invention for improvements in electric arc lamps relates to the controlling
bobbins, the idle resistance and the cut out.
The main frame of the lamp comprises a central tube that supports the
mechanism. The cores of the controlling bobbins are shaped, the bottom of
the surrounding the central tube of the lamp. The two limbs of the series core
descend into their coils and the shunt core is inverted, the two limbs ascending
into their coils. The two cores are suspended from a disc having a boss sliding on
the central tube of the lamp. The disc is connected by a flexible cord passing
over pulleys near the top of the central tube to the cylinder of the dash pot having
a fixed piston and connected by a controlling tube passing down the central tube to
the arc controlling mechanism. The pulleys are mounted between plates passed
through a rectangular hole in the central tube.
The idle resistance is arranged between a dome shaped cap at the top of the
central tube and an inner dome that is forced upwards against the dome cap by a
nut screwing on the boss of the cap. The two terminals of the lamp and the fuse
terminals are fixed on insulating strips on the under surface of the inner dome.
The cut out coil, and core are supported upon the terminal of the lamp upon the
body or chamber containing the mechanism. The core is insulated and the
armature is supported in an arm pivotted to the central tube and working between
stops. The circuit is so arranged that the terminal on the body of the lamp is, say,
the negative and the body itself the positive. Then shaped core is wound with
a conductor insulated from it except at one end, the other end being connected to
the negative terminal.
The armature closes the circuit when it touches the poles of the core, and the
shunt core of the lamp lifts the armature up to the poles.
In an alternating lamp a choking or impedance coil is substituted for the
resistance and the shunt coil is wound to suit the frequency.
In the accompanying sheet of illustrative drawings:
Figs. 1 and 2 are sectional elevations at right angles to one another of an
enclosed arc lamp constructed according to this invention.
Fig. 3 is a plan of the top of the lamp.
Fig. 4 is a sectional plan through the controlling bobbins.
Figs. 5 and 6 are elevation and plan of the cut out.
Fig. 7 is a plan of the bottom yoke.
The frame of the lamp comprises a central tube a and the upper disc b rigidly
secured to the lower end of the tube a and forming the top of the chamber
containing the regulating mechanism. The cylindrical case e closed at its lower
end is screwed into the flange of the disc b and the bottom yoke f is carried from
the bottom of the case e by the yoke rods f¹. The top of the tube a is closed by
an insulating plug as having metal caps on its ends. The lower end screws into
the tube a. On the upper end is screwed the dome 1. The plug is fixed in the
tube a and in the dome 1 by screws passing through the tube or dome and into
the plug. The ornamental casing c rests on an insulating plug cl.
Near the top of the tube a is a rectangular hole through which are passed
plates a' carrying pulleys a². Fitting within the tube a below the plates a¹ is a dash

page_text: pot cylinder i fixed to the centre of the cord i¹ passing over the pulleys a² and
connected to a disc 2 sliding on the central tube a. The piston of the dash pot
is fixed by the pin to the tube a. The cylinder i is connected by the side
pieces and pin to the links 7 pivoted to a cap piece fixed in and closing
the upper end of the controlling tubes that fits freely within the tube a aud
descends into the case e. The link slides through a hole in the plug a' closing
the tube a.
The tube s is fitted with balance weight or damper disc s² working within the
case e and assisting the dash pot action.
The regulating bobbins g g₁ are secured between two discs g² mounted on the
tube a.
The U-shaped core of the series bobbing at its upper end passes round
the tube a and is secured to the boss of the controlling disc 2. The U-shaped
core h¹ of the shunt bobbin g¹ at its lower end passes round a sleeve sliding freely
on the tube a and at its upper ends is secured by the links h² to the controlling
disc 2. The cores are made out of sheet iron and may be opened out at their
centres to encircle the boss or sleeve by forcing a mandrel or drift through their
centres.
The upper carbon holder slides in the controlling tube s and has its upper end l¹
coned. Balls are placed in the tube s and bear on the cone and the tube 8 and
make a good contact. The upper carbon m passes between two jaws n n¹ fixed
respectively between the pair links n² n³ n' n³." The links n2 and n³ and also n+
and n are pivoted together at their meeting ends and are connected by the
links n n to the lower end of the tube s. Normally the jaws rest on a stop at the
bottom of the case c. The lower carbon holder c screws or fits into the lower end
of the enclosing transparent bell p and the whole rests on a spring o fitting in a
recess or hole in the stud o2 screwing into a crossbar f2 fitting in notches or
trunnions in the bottom yoke f. The cross piece f2 can be lifted out of the yoke f.
The stnd o² also carries the nut os for securing the usual globe q in position.
The resistance coil r is coiled round between the dome r¹ and an inner dome >²
and is secured to the dome r¹ by the nut 3. The outer surface of the dome 71 is
ribbed to carry away the heat.
The cut out comprises the coilt and the core t¹ fixed to but insulated from a
support t2 carried by the frame disc b. The armature t³ is fixed to the arm t¹ pivoted
to the boss 6' on the frame plate b and working between stops. One end of the
coil is connected to the negative terminal d¹ of the lamp and the other end to the
core t¹. The insulated armature t³ is connected to the frame of the lamp and thus
to the positive terminal d.
The current enters the lamp by the positive terminal d, passes then through choke
or resistance coil to the fuse terminal d² fuse 3 fuse terminal d terminal b₁ plate b,
tubes a, 8, carbons, yoke, insulated terminal 63 the series coil g, insulated terminal b²
to the main terminal d¹. The shunt coils are connected directly across the
terminals d d¹.
The carbons being in contact the upper carbon resting on the lower by its own
weight, on the passage of the current through the series solenoid g, the core his
drawn down and consequently the tube 8 is drawn up and first raises the
links n nn³n off the stop plate and then causes the jaws to grip the carbon and
raise it and strike the arc. As the arc lengthens due to the burning away, gradually
the grip device is lowered onto the stop plate and the jaws relax their hold on the
carbon and a continuous and steady feed is obtained by the upper carbon slowly
descending through the jaws.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is:
-
1. The arrangement of the controlling magnets and their cores substantially as
described.

page_text: 2. The arrangement of the resistance or choking coil substantially as described.
3. The cut out constructed substantially as described.
4. The improved electric arc lamp, substantially as described with reference to
the drawings.
Dated this 3rd day of October.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.