Year: 1887

page_text: I ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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:-
P P
Between two vertical spring blades s s (Figure 1) fitted into the end a of a lever
is placed a carbon rod d sliding in guides u u. This carbon rod traverses an inverted
cone c in which fit the lower ends of the spring clips ss provided with jaws or clamps i
which latter fit the shape of the carbon d without however pinching it. The cone c
is fixed to the end of a lever y y pivoted or fulcrummed at y² and carrying at the
other end the armature which the electro magnet f¹ attracts when traversed by the
current. Adjustable stops m n limit the oscillation of the lever y y¹ and a spiral
spring g tends to hold the armature away from the electro magnet.
The two spring
clips s s are fixed to the end of the lever p p the position of which is regulated by a
stop and which is held up by a spiral spring r. Underneath and in a vertical line with
the above described carbon is held another carbon d in a clamp and in a state of rest
the upper carbon would fall by its own weight into the lower one.
When the current passes through the carbons and the electro magnet ff¹ the latter
becomes active and attracts the armature of the lever y y' thereby lifting the inverted
cone e which will press the jaws i of the spring clips ss against the carbon d lifting
the former with the latter together away from the lower carbon when the arc will
form at z.
The electro magnet lits armature o the contact piece and the hammer form an
electric bell arrangement with the difference that the bell is represented by the end of
the lever pp. The electro magnet is operated by a current emanating from the
two carbons, or by part of the current traversing the arc or by a combination of the
two; at all events the tension of the spring t must be so regulated that the armature o
is only attracted at a predetermined length of the are and only then will the hammer h
strike against the end of the lever p p.

page_text: The clamps or jaws i will thereby release the upper carbon for a moment and the
latter will drop for a very short distance to be at once again clamped between the jaws i
by the lifting of the lever pp by the spring . The hammer h will continue its
trembling motion until the upper carbon has descended sufficiently when the apparatus
will be at rest again until the are has again surpassed its normal length.
The upper carbon may be replaced by a nicely worked metal rod carrying the
carbon at its lower end. The whole of the mechanism may also be reversed if
desirable so that the lower carbon would then be lifted either by a spring or by a
counter weight.
Figure 2 represents an arrangement which permits the are to be removed or kept
away from the delicate parts of the mechanism.
In this arrangement the inverted cone c instead of being fixed to the end of the
lever y y¹ is supported by a tube which surrounds the spring clips ss with its jaws
and the upper carbon and is guided in its movement by an outer tube b in which it
slides easily.
It is well understood that the above described regulating mechanism is not confined
to the herein described are lanıp arrangement but may be used with other are lamp
arrangements without departing from the principle of the invention.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed I declare that what I claim is :-
1. In an electric arc lamp a mechanism consisting of spring clips such as ss provided
with the jaws i at their end which surround the carbon or carbon carrying rod and
clamp or release the carbon or rod according to the position of an inverted cone
such as c substantially as and for the purpose specified and represented in the accom-
panying drawings.
2. In an electric arc lamp a regulating mechanism consisting of an electro maguet
such as armature o hammer and a contact piece producing the regulation of the
are by repeated shocks or tremblings substantially as and for the purpose specified and
represented in the accompanying drawings.
D
1
1-1 1
1007