Improvements in Electric Arc Lamps.
Year: 1894

page_text: Date of Application, 15th Feb., 1894
Complete Specification Left, 15th Nov., 1894-Accepted, 15th Dec., 1894
PULTICATION.
Improvements in Electric Arc Lamps.
We, ALFRED WILLIAM MONEY and HERBERT NASH, both of 19 Palace
Gardens Mansions, Notting Hill Gate, in the County of Middlesex, Electrical and
General Engineers, do hereby declare the nature of this invention to be as
follows:-
The invention has for its object improvements in electric are lamps whereby two
pairs of electrodes are employed regulated by a single regulating apparatus for the
upper carbons, thereby obtaining two arcs in one lamp at only a small extra
expenditure of power for their regulation as compared with that now required for
the regulation of a single arc.
To accomplish this we preferably employ our improved apparatus, described in
the Specification of Letters Patent granted to us No. 12807 of the year 1892, for
gradually lowering the upper carbon holders, but other suitable apparatus may be
employed.
To the lower end of the carbon rod or rack we attach two carbons side by side,
one in electrical connection with the rod or rack, the other insulated therefrom.
The two lower or negative carbons are placed directly under the upper or
positive carbons, as in the ordinary way when only a single pair of electrodes are
used, but are capable of being moved vertically through a limited space.
To control the vertical movement of these lower carbons, rods are taken from
each holder through the base plate of the lamp and connected to the lower end
of iron cores working in solenoids, but one of them insulated from its connected
iron core, the upper ends of the said cores being coupled to the opposite ends of a
rocking lever.
The solenoids actuating these cores are wound with fine wire and connected as
shunts across each respective arc, thereby maintaining an equal distance between
the points of the two pairs of carbons.
Any impurities or inequalities in the carbons are compensated by imparting a
rocking motion to the aforesaid rocking lever as required and such rocking motion
is governed by the resistance of the arcs.
It will be evident that in lieu of lowering the upper carbons and acting on the
lower carbons by a rocking lever to compensate for impurities or inequalities
therein, the reverse arrangement may be adopted.
We do not confine our invention to the working of two arcs side by side, as the
carbons may be placed in the same line one above the other and burn the arcs in
tandem fashion, but in this case the lowest carbon partially counterbalances the
uppermost carbon by means of a flexible cord passing over a pulley, which allows
them to approach the centre carbons at the same speed, and the position of the
central carbons is regulated as hereinbefore described with differential shunt wound
Bolenoids connected across each arc.
Instead of employing solenoids with loose cores as above described, electro-
magnets may be substituted therefor.
Dated this 15th day of February 1894.

page_text: Improvements in Electric Arc Lamps.
We, ALFRED WILLIAM MONEY and HERBERT NASH, both of 19 Palace
Gardens Mansions, Notting Hill Gate, in the County of Middlesex, Electrical and
General Engineers, 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 :-
The invention has for its object improvements in electric arc lamps whereby two
pairs of carbon electrodes are employed regulated by a single regulating apparatus
for the upper carbons, thereby obtaining two ares in one lamp at only a small
extra expenditure of power for their regulation as compared with that now required
for the regulation of a single arc.
One form of carrying our invention into effect is illustrated in the accompanying
drawings, in which:-
Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a vertical section and
Fig. 4 is a plan, of an electric arc lamp fitted with two pairs of electrodes
producing two arcs side by side, the upper carbons being regulated by a single
regulating apparatus.
Fig. 5 is a horizontal section on the line 5-5 of Fig. 1 and Fig. 6 is an under-
Bide view with parts removed.
a a* are the upper carbons and 6* the lower carbons, c is the base plate of the
lamp and ce are two pillars attached to the base plate cand from which the lamp
is suspended by means of the hinged hanger c².
In carrying our invention into effect we may employ our improved apparatus,
described in the Specification of Letters Patent granted to us No. 12807 of the
year 1892, for gradually lowering the rod carrying the upper carbons, but other
suitable apparatus may be employed; that represented in the accompanying
drawings is as follows.
The upper carbons a a⭑ are carried by a cross head a¹ fixed at the lower end of
the upper carbon rod a², which is formed, as heretofore, with a rack a³, and the
descent of the upper carbons a a* is regulated as follows.
.
The rack a rotates a pinion at which gives motion to a train of gearing carried
by a frame a pivotted on the axle of the pinion a'; the outer end of the frame a
is connected by a link a to one end of a pair of rocking levers a' centred at a³ on
the main column or tube a³, and one end of such rocking levers a' is pinjointed to
the lower end of a loose soft iron core a passing freely through the solenoid a",
said core a¹ being connected at its upper end to a radius lever a¹ and provided
with a regulating weight a¹. The solenoid a" is in series with the line. Thus the
descent of the upper carbons a a* is regulated by the train of gearing. The
core a¹, being drawn up within the solenoid a", raises the frame as, which, through
the train of gearing, slightly turus the axis of the pinion a¹ and thereby raises the
rod a² and separates the two pairs of carbons, and in doing so, a wheel or fly of
the train of gearing is brought into contact with the stop a to arrest the motion
of the train of gearing and thus prevent the descent of the upper carbons until
the current through the lamp is again reduced. The movement of the core a¹ is
steadied by means of the dash pot a", piston a" and connecting rod a" attached to
the rocking levers a'.
The above named regulating apparatus is in common use and forms no part of
our invention.
The carbon a is preferably in electrical connection with the rod a²; the other
is preferably insulated therefrom, but other suitable arrangement may be
amploved.

page_text: The two lower or negative carbons 66* are placed directly under the upper or
positive carbons a a, as in the ordinary way when only a single pair of electrodes
is used, but are capable of being moved vertically through a limited space. To
control the vertical movement and thereby adjust these lower carbons, a rod & from
each holder is taken through a guide tube and through the base plate c of the
lamp, and such rods 62 are, by links 63 and a rocking lever b', connected to the lower
ends of iron cores 6* working in solenoids 6 6, one of such rods being
insulated from its connected iron core b* and the upper ends of the said cores being
coupled to the opposite ends of a rocking lever 6'. The movement of the
cores bb is steadied by the dash pot and the piston and piston rod 6° working
therein and connected to the rocking lever b. The solenoids 66 66* actuating these
cores 66* are wound with fine wire and connected as shunts across each respective
arc, thereby maintaining an equal distance between the points of the two pairs of
carbons b. Auy impurities or inequalities in the carbons are compensated by
the current imparting a rocking motion to the aforesaid rocking lever 64 as required,
and such rocking motion is governed by the resistance of the arcs.
It will be evident that in lieu of lowering the upper carbons and acting on the
lower carbons by a rocking lever to compensate for impurities or inequalities
therein, the reverse arrangement may be adopted.
We do not confine our invention to the working of two arcs side by side, as the
carbons may be placed in the same line one above the other and burn the arcs in
tandem fashion, but in this case the lowest carbon partially counterbalances the
uppermost carbon by means of a flexible cord or band attached to its carrier passing
over a pulley which allows them to approach the centre carbons at the same speed,
and the position of the central carbons is regulated, as herein before described,
with differential shunt wound solenoids having loose iron cores and connected across
each arc.
Instead of employing solenoids with loose cores as above described, electro-
magnets may be substituted therefor.
We have not thought it necessary further to describe the mouifications above
referred to, as such, aided by the description herein given, will be readily understood
by competent electricians.
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. An electric arc lamp having two pairs of carbon electrodes in series and a
single regulating apparatus for the upper or positive carbons, substantially as
herein shown and described.
2. An electric arc lamp having two pairs of carbon electrodes in series, a single
regulating apparatus for the upper, positive, or other carbons, and an apparatus
for moving the lower, negative, or other carbons vertically through a limited space
controlled by differential shunt magnets, substantially as herein shown and
described.
3. The improvements in electric arc lamps substantially as herein shown and
described.
Dated this 15th day of November 1901