Improvements in or relating to Electric Arc Lamps.
Year: 1897

page_text: Improvements in or relating to Electric Arc Lamps.
(A communication from ERNEST ALBERT PELLET, of 21, Rue Daniel, Asnières
(Seine), in the Republic of France, Engineer, and JULES DÉJARDIN, of 25,
Boulevard St. Martin, Paris, in the Republic of France, Engineer.)
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:
The apparatus forming the object of the present invention is applicable only to
arc-lamps, the carbons of which are not directly opposite to each other, that is to
say to such in which the axes of the two carbons are parallel or oblique to each other.
In such lamps, the carbons, pointed in the usual way, have been arranged with
their points out of line and overlapping, the points not being opposite each other,
press, under the influence of springs, which force the carbons forward, against
blocks of magnesia or other refractory substance secured to the carbon-holders in
front of the carbons. This arrangement has a great draw-back preventing such
lamps from being generally adopted. The carbons become consumed around the
circumference of their points. As the blocks generally become slightly softened
under the influence of heat, the carbon-points penetrate into them without being
consumed; the result is that the conical portion of the carbon becoming thinner
and thinner, the carbon has a tendency to break and so extinguish the light; as
this was of frequent occurrence this system has not hitherto been adopted."
The object of the present invention is to remedy this drawback by the following
apparatus.
The carbons slide in fixed supports the fixed refractory blocks being replaced by
disos of magnesia or any other highly refractory material; these discs rotate on
a pivot supported in brackets secured to the carbou-guides. The discs are always
arranged so that the axes of the carbons are tangential to the circumferences of
said discs and are in the central plane of the latter. This simple arrangement
causes the carbon points to be uniformly consunied on their entire conical surfaces
and the incandescent discs to turn without allowing the point or any other part
of the carbon to escape combustion.
The result is an absolutely regular advance of the carbon and a uniform light,
which has been impossible with the incandescent lamps of this description hitherto
used.
Dated this 4th dow of ir…. iedz

page_text: (A communication from ERNEST ALBERT PELLET, of 21, Rue Daniel, Asnières
(Seine), in the Republic of France, Engineer, and JULES DÉJARDIN, of 25,
Boulevard St. Martin, Paris, in the Republic of France, Engineer.)
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
-
The apparatus forming the object of the present invention is applicable only to
arc lamps, the carbons of which are not directly opposite to each other, that is to
say to such in which the axes of the two carbons are parallel or oblique to each other.
In such lamps the carbons pointed in the usual way have been arranged with
their points out of line and overlapping as shown in Fig. 1, the points not being
opposite each other, press under the influence of springs which force the carbons
forward, against blocks of magnesia or other refractory substance secured to the
carbon-holders in front of the carbons. This arrangement has a great drawback
preventing such lamps from being generally adopted. The carbons become con-
sumed around the circumference of their points and assume the shape shown.in
dotted lines in Fig. 1; in the latter A are the carbons which the springs tend
to move in the directions indicated by the arrows. Bare the fixed refractory
blocks. As the blocks B generally become slightly softened under the influence
of heat, the carbon-points penetrate into them without being consumed; the
result is that the conical portion of the carbon becoming thinner and thinner, the
carbon has a tendency to break and so extinguish the light; as this was of frequent
occurrence, this system has not hitherto been adopted.
The object of the present invention is to remedy this drawback by the following
apparatus represented in Fig. 2.
The carbons A A slide in fixed supports C, the fixed refractory blocks B of
Fig. 1 being replaced by discs of magnesia or any other highly refractory material;
these discs rotate on a pivot supported in brackets secured to the carbon-
guides C.
The discs are always arranged so that the axes of the carbons, are
tangential to the circumferences of said discs and are in the central plane of the
latter. This simple arrangement causes the carbon points to be uniformly con-.
sumed in their entire conical surfaces and the incandescent discs to turn without
allowing the point or any other part of the carbon to escape combustion.
The result is an absolutely regular advance of the carbon and a uniform light,
which has been impossible with the incandescent lamps of this description hitherto
used.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondents and in what manner
the same is to be performed I declare that what I claim is:
'
$
1. In arc-lamps in which the carbons are not arranged in line with each other
discs of magnesia or other refractory material rotatable on fixed pins and arranged
so that the axes of the carbons are tangential to the circumference of the discs
substantially as and for the purpose described.
2. In arc lamps of the character described in which the carbons are not arranged
in line with each other discs such as B of magnesia or other refractory. material

page_text: carried on
stantially
pins by brackets such as D secured to fixed supports
as described.
on the lamp sub-