Improvements in Arc Lamps.
Year: 1898

page_text: Date of Application, 31st Oct., 1898-Accepted, 4th Mar., 1899
Improvements in Arc Lamps.
We, AUGUST BErnhardt Barnikol-Veit, Electrotechnist, of 7, Mittelstrasse,
Leipzig, and AUGUST WILHELM RIEBEL, Merchant, of 7, Funkenburgstrasse,
Leipzig, both in the Empire of Germany, 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 arc lamps relates to an arrangement in arc
lamps with oscillating regulating mechanism and fixed magnets, by which it is
possible to secure a constant tension in the regulating mechanism in order to pre-
vent play between the parts and thus insure an easy uniform action of the same.
The arrangement and mode of working of the invention will be readily under-
stood with the aid of the accompanying drawing, in which:
Fig. 1 is a side view of the regulating mechanism of an arc lamp constructed
according to this invention and
Fig. 2 an end view of the same.
In order to provide a firm and sure bearing for the armature A, and to prevent
any automatic loosening or shifting of the same, the armature A is supported on
both sides by means of stays S, which are pivotted at i on bearing blocks B.
The frame of the wheel-work (see Fig. 2) is held against the bed plate in tho
usual manner by a spring T. An angle piece U on the frame of the wheel work
overlaps the armature A, so that when the armature moves towards the magnet
the wheel work is carried along with it. The motion of the armature is limited
by its striking against an adjusting screw V (see Fig. 1).
Further, the armature A is formed in such a manner, that it engages below the
pole "shoes" C of the electro-magnets, whereby any failure of the wheel-work
to act is prevented, and beyond this, for the purpose of securing a constant tension
at all times, the stays S are made of material readily expansible by heat such as
copper, whereby, in combination with the peculiar arrangement of the armature A,
upon the heating of the magnetic coils and the greater resistance resulting there-
from, as well as diminution of the magnetic force in the pole "shoes" C, the
stays S become heated and extended and thereby in the same proportion as the
effect of the current is diminished, the armature approaches the pole shoes and
thus a balancing effect is produced, which secures a constant tension.
The form and arrangement of the remaining parts of the wheel-work may be
varied, according to the object in view at the time.
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:-
An arrangement in arc lamps with oscillating regulating mechanism and fixed
magnets, the distinguishing feature of which is that, for the purpose of securing
a constant tension, as well as the uniform action of the wheel-work, the arma-

page_text: ture A is firmly connected on both sides with stays S made of material readily
expansible by heat and held at the point i by bearing blocks B, so as to be capable
of moving, the said armature engaging under the shoes of the poles.
Dated this 31st day of October 1898.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.