From: Tox Gunn (tox@remarque.org)
Date: 10/25/01-10:14:25 AM Z
For a slightly different alternative use:
When I was doing custom jewelry work about 12 years ago, we'd
use sections of the longer, thicker rods as "slag sticks".
By drawing the rod across the melt after it had been fluxed,
the degraded flux and oxides would stick to the rod and leave
a clean melt ready to cast. The ends of the rods would periodically
get a chipping clean, but no other care needed. Worked pretty well.
Tox
> Too bad. The article I posted seemed to indicate that some movie projectors
> still used carbon arc and when I worked at City Hall in LA (I've been
> retired from their for 6 years) my office used to look down on the street
> and many films were made using the City Hall chambers and surrounds as a
> setting and if I am not mistaken they stilled used carbon arcs. As you say:
> instant on and color stabilization. This could well be a factor for their
> continued use. Dick Knoppow here is quite a film and movie technology
> historian and maybe he'd know. Rods should not be too hard to glom onto.
>
> --Dick
>
>
> At 01:11 AM 10/25/2001 +0200, you wrote:
>
>
> >Richard Sullivan FRPS wrote:
> > >
> > > Sam,
> > >
> > > No problem with getting the rods. Apparently they are the same as sold in
> > > welding stores and are still used in movie projectors in outlying areas.
> > >
> >
> >Richard,
> >
> >Copper mantled carbon rods from welding store do not work. I tryed it.
> >Iīv got 30 cored carbon rods Le Carbonne brand, 12, 14 and 18 mm dia,
> >length 250 mm, and I recon that a pair of rods will last about 4 hours
> >of burning time. I am still looking to buy more rods. I found a
> >company in USA which makes them but I didnīt have time to contact them
> >and ask for details: http://wwww.nationalspecialties.com/
> >
> >My antique carbon arc light is an open fixture and lightens
> >horisontaly so a have to tilt my vacum frame verticaly. It is conected
> >over the transformer 220V to 45 V AC, 40 Amp. The transformer is very
> >havy and today I donīt understand how I put it in the place.
> >
> >To teach my grand children about darkroom dangers I turned that light
> >on in their presence and humming from the arc and the transformer
> >plus that strong light scared them enough not to touch the darkroom
> >door without me.
> >
> >The light is very strong and consistent, no warm up time. I use it
> >occasionaly for exposing of photogravure tissue. Seven minutes at
> >0,8 m distance. No, I donīt look in the arc, and I donīlike to look
> >in the sun either. The switch is five meters from the light, I donīt
> >see the arc, I just leave the room when exposing.
> >
> >Kemal
>
>
>
This archive was generated by hypermail 2b30 : 11/02/01-08:55:27 AM Z CST