>
>
> On Thu, 14 Sep 1995, David Black wrote:
>
> > I am looking for a good source for a carbon arc lamp or any other good and
> > inexpensive light source for kallitypes. Any ideas will be greatly appreciated
> > Thanks in advance.
> >
> > David Black <ZU03632@UABDPO.DPO.UAB.EDU>
> >
> David,
>
> I could be wrong about this, but I remember talking to a guy who had a
> carbon arc lamp for a copy camera (the type used to make half-tone, PMTs,
> etc) and he told me that carbon arc lamps had been made illegal some
> years ago. It had something to do with gases given off by the rods I
> think.
I can't say that I have actually seen or used a carbon arc lamp, but I
have experimented briefly with carbon arcs used in welding (You can use
the arc to heat/melt metal.). If they don't make carbon arc lamps
anymore and you really want one you should be able to build one fairly
easily. You could probably check at the local welding supply store for power
supplies and carbon rods, build a box to put the thing in and protect you
and everything else from the arc, turn it on and strike the arc. It would
probably be easier to try something like a mercury vapor lamp first though.
I'm not too sure about the gasses given off by the arc, but you probably get
carbon dioxide, carbon monoxide, and ozone. I would guess that any other
gasses would come from impurities in the rod or any coatings (like
copper) that help with striking the arc.
Don't know if this helps you much.
- Wayde
(allen@boulder.nist.gov)