Improvement in Electric Arc Lighting.
Year: 1888

page_text: Date of Application, 28th Sept., 1888
Complete Specification Left, 27th May, 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION
Improvement in Electric Arc Lighting.
1, LLEWELLYN SAUNDERSON Esquire, J.P. of 10 De Vesci Terrace, Kingstown
County Dublin, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to improve the colour of the electric are lamp and
do away with the flicker usually found in them.
The electrodes are either made hollow or they have small gas burners close to the
arc-flame so as to feed the flame with either coal or mineral oil gas. The hollow
electrodes also can be partially filled with solid petroleum or with vaseline which is
vaporised by the heated electrodes and thus feoding the flame with petroleum
vapour.
The are light is by this means greatly enriched with yellow and red rays, and also
the light is made more steady.
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COMPLETE SPECIFICATION.
Improvement in Electric Arc Lighting.
1, LLEWELLYN SAUNDERSON Esquire, J.P. of 10 De Vesci Terrace, Kingstown,
County Dublin, 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 :-
The object of my invention is to improve the color of the light from the electric
arc lamp and to do away with the flicker usually found.
This may
For this purpose the arc is supplied with hydrocarbon gas or vapour.
be done by inaking the carbon electrode with a hollow or passage through and filling
this with vaseline or solid petroleum. Or coal or oil gas may be supplied to the arc
through the electrode or from burners ranged around it.
The are light is by this means greatly enriched with yellow and red rays and also
the light is made more steady.
In the annexed drawings Figure 1 is a longitudinal section and Figure 2 is an end
view of a carbon electrode having a longitudinal passage through it which is filled
preferably with vaseline; or an asbestos wick may be led through the passage in the
electrode into a reservoir at the further end in which the hydrocarbonaceous body is
contained. The hydro carbonaceous body melted by the heat is conveyed by capillary
attraction to the vicinity of the arc where it becomes vapourised. Figure 3 is a
longitudinal section of a hollow electrode with a flexible gas pipe adapted to it.
Figure 4 is a longitudinal section of a pair of electrodes to which gas is supplied from
a ring burner.
The upper electrodes may be carbon rods of the ordinary sort; or in some cases
the upper electrodes may be hollow for the supply of hydrocarbonaceous gas or
vapour to the arc.
The ring burner represented in Figure 4 is supplied with gas by a small pipe and
it has ranged equidistant around it, three or other number of small perforations
directed inwards to the focus. The quantity of gas required to produce the best
effect is quite small and is readily regulated by means of a stop cock upon the
gas pipe.
The are may be supplied with the vapour of liquid petroleum from a small receiver
placed near the are so that it becomes heated thereby; vapour is generated and issues
by a jet directed to the focus. The receiver is connected by a pipe with a reservoir

page_text: at a distance and by suitable cocks and apparatus the supply of petroleum to the
receiver is regulated.
The invention is applicable to the so called candle electrodes, where the two.carbons
are parallel the one to the other and separated by an insulating composition. A
passage may be made in this composition as in the electrodes shown by the
figures 1 and 2 and this passage serves for the supply of hydrocarbon to the arc
as already described.
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. The process for the improvement of the electric arc light consisting in supplying
hydro-carbon gas or vapour to the arc by means substantially as described.
2. The process for the improvement of the electric are light consisting in
introducing a solid hydrocarbonaceous body into a passage or hollow in one of the
carbon electrodes between which the said arc is displayed.
3. The process for the improvement of the electric are light consisting in supplying
a hydrocarbonaceous gas or vapour to the arc through a passage or hollow in one of
the carbon electrodes between which the said arc is displayed.
4. The process for the improvement of the electric are light consisting in supplying
hydrocarbonaceous vapour to the arc displayed between carbon electrodes.
Dated this 22nd day of May 1889.
LLEWELLYN SAUNDERSON.