Improvements in Electrical Arc Lamps.
Year: 1899

page_text: Date of Application, 4th May, 1899-Accepted, 17th June, 1899
COMPLETE SPECIFICATION.
Improvements in Electrical Arc Lamps.
I, JOSEF ROSEMEYER, Electrical Engineer, of 18, Auerschulstrasse, Elberfeld,
Westfalen, Germany, do hereby declare the nature of my said invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement;
Electric arc lamps are known in which the arc is surrounded by a glass globe
enclosing the same and a second glass globe having its upper part air tightly closed
whilst the under part is in communication with the outer air.
The object of this arrangement is to keep the oxygen of the air from the ends
of the carbons and thus to retard the combustion of the same which only takes
place at the beginning, the globes subsequently containing nitrogen, carbonic acid
or carbonic oxide only. In these lamps however the oxygen in the outer globe
must be consumed before the desired effect is attained and since this takes up con-
siderable time, the operation is not perfect.
The object of the present invention is to render the amount of oxygen which
has to be consumed at first, as small as possible.
In order to render the present specification more easily intelligible reference is
had to the accompanying drawing:
Fig. 1 is a vertical section through a lamp constructed according to the present
invention, Fig. 2 a horizontal section through the lower part of the same and Fig. 3
a vertical section through a modified form of the lamp.
To the lower part of the regulator housing a flat insulated chamber m is bolted
or otherwise attached having at either side of the lamp, two downwardly extend-
ing tubular sockets bb, in which the parallel tubes dd are fixed. The lower ends
of these tubes are closed by a cross piece c which may be hinged at one side and
supported at the opposite side in the end of the tube as shown at Figure 1. This
cross piece carries the holder ƒ for the carbon said holder being vertically adjust-
able by means of the screw and nuts f¹. Supported in the said holder is further
a glass globe a having its lower end let into the upper surface of the holder f and
its upper end closed by a plate n having central boring to receive the upper car-
bon . The globe a is provided with suitable packing at each end in the holder f
and the chamber m which is formed to receive the upper end of the globe.
The air present in the globe a will pass out at the top of the globe a between
the upper carbon and the cover n, the orifice in the latter being slightly larger
than the diameter of the carbon. The air and gases thus pass into the chamber m
and down the pipes d d escaping at the lower ends of the latter through the open-
ings d¹.
In Figure 3 a modification of the device is shown, the lower carbon holder f
being supported in a suspended bow f² and supporting, air tightly closed, the
globe. The latter is closed at the top by means of a plate having an orifice
to allow the upper carbon ¹ to pass through. A second globe g surrounds the
upper part of the globe i said globe g being air tightly fixed to the lower part of
the regulator housing and having its lower open edges tapered towards the globe i

page_text: so as to almost close on to the exterior walls of the same, leaving only a small
annular space for the passage of the air.
In this modification the air and gases pass out between the upper carbon and
the interior walls of the orifice in the plate and downwards in the globe or
cylinder gescaping at the bottom of the latter."
In both the modifications described an outer globe may be employed as shown
at K in Figure 3, but such outer globe will have no effect on the operation of
the device.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is;-
1. In an arc lamp in which the arc is enclosed in a hollow body, closed at the
bottom and having opening for the upper carbon at the top, the arrangement of
downwardly extending tubes from the upper chamber having openings at their
lower ends or of a downwardly extending casing forming a lower annular open-
ing, so as to allow the gases and air within, free outlet, but to restrict the en-
trance of the outer air to the said chamber in the manner and for the purpose
substantially as described.
2. The construction of an arc lamp in the manner and for the purpose sub-
stantially as described.
Dated this 4th day of May 1899.
REGINALD W: BARKER,
Applicant's Agent, 56, Ludgate Hill, London, E.C.