An Improved Device for Guiding the Carbons in Electric Arc Lamps.
Year: 1897

page_text: Date of Application, 15th Nov., 1897-Accepted, 29th Jan., 1898
COMPLETE SPECIFICATION.
An Improved Device for Guiding the Carbons in Electric Arc Lamps.
We, RICHARD WILHELM LUDWIG HOLSTEN and the ELEKTRISCHIE BOGEN-
LAMPENFABRIK NAECK & HOLSTEN GESELLSCHAFT MIT BESCHRÄNKTER HAFTUNG,
both of Stralsund, in the Empire of Germany, Engineer and Manufacturers
respectively, 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 relates to a device for guiding the carbons in electric arc lamps.
This improved arrangement admits of the use of carbons of 3 to 5 millimetres in
thickness for arc lamps of from 100 to 600 normal candle power, these very thin
carbons with a length of 200 to 250 millimetres being maintained in the correct
position to one another.
The improved arrangement is shown in the accompanying drawing in sectional
elevation.
The upper carbon holder a and the lower holder b are movably mounted in the
axis of the carbons in order to prevent any inclining or sticking of the carbons.
The arrangement for guiding the carbons consists of a disc e adjustably mounted
on the guide tubes of the carbon holders by means of clamp sockets or clips f on
which disc c there is arranged a mica plated for guiding and insulating the upper
carbon a¹, said disc c being connected below by means of short bars e¹ to a cross
bar e for guiding the lower carbon 61. The mica plate d and also the under cross
bar e are easily replaceable to allow of the insertion of carbons of other diameters.
This guide for both carbons is so adjusted that the arc is formed exactly in the
middle between the disc c and the cross bar e. The disc c is enamelled under-
neath and serves as a reflector.
Any too great a formation of shadows is avoided by arranging the short bars e¹
in a plane common to the two guide tubes and by the cross har e being placed
edgewise. The small shadow formed by the narrow edge of this bar is more than
compensated by the action of the reflector c.
In order to insert a fresh carbon, the disc c and cross bar c are first pushed
upwards in order to allow of the unimpeded insertion of the lower carbon. When
this has been done, the disc and bar are. pushed over the lower carbon and thus
room is obtained for easily inserting the upper carbon. When this has been done,
the disc c and bar e are so adjusted that the arc is formed in the middle between
disc and bar.
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:-
A device for guiding the carbons in electric are lamps, consisting of a disc (c)
adjustably mounted on the guide tubes of the carbon holders, and bearing a mica
plate () for guiding and insulating the upper carbon and a cross bar (e) for guidi-
ing the lower carbon, said disc (c) and cross bar (e) being adapted to be so

page_text: adjusted after the insertion of the carbons that the arc is formed between the disc
and the bar substantially as herein before described.
Dated this 12th day of November 1897.
WM. P. THOMPSON & Co.,
'Of 6, Lord Street, Liverpool, Agents for the Applicants.