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This topic comprises 2 pages: 1 2
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Author
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Topic: Carbon Arc (Cinema carbons Vs Gouging electrodes)
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 11-02-2005 03:47 AM
My experience was that a very shallow, irregular, crater formed in the positive; a stable arc would burn for a few seconds once this formed, but would then wander around the tip of the positive at random for a while, before briefly stabilising again. Even when the arc was stable, light output was very poor. The carbons did have some sort of core, but goodness knows what was in them; certainly not like projection carbons, which I think use Cerium salts in the core of the positive.
I believe that welding, brazing, gouging etc. arcs normally run on a.c., and use a pair of similar carbons. I didn't try using one of these carbons as a negative, with a proper positive; I suspect this might have a greater chance of working, but I don't know for sure. They are hopeless as positives. They might possibly work in the old low intensity, vertical, arcs, like the ones used in Brenographs, and some old spots, but I haven't tried it, and I think it's highly unlikely that anybody is still projecting film with those type of lamps today. The only film projectors I've seen with them have been hand-cranked silent machines, in museums.
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