Any filter used for direct viewing of the arc plasma MUST protect the eyes against all wavelengths of energy -- so welders dark glass would be about the only suitable filter there.

But since Frank was talking about augmenting welding glass with a Rosco gel, the UV issues shouldn't apply to the gel. I was merely referring to heat issues.

--jhawk

Actually, I think Steve already answered in that the change was made before Strong got out hands on Century. When I'm back in the plant next week I'll take a look-see. I know we use a green welder's glass in the lamphouses to directly view the arc but as John pointed out, that spot sight glass doesn't look at the arc but at the circle of light at the aperture.

I'll take a look at glass when I'm back in the office. Hopefully Monday but I'm off on a trip that day as well.

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I'll reitterate one of my own. Does (did) Bob Potts get compensated as the designer of the Strong platter when Strong started buying units of his design straight from the fabricator contracted to build them and then more recently purchased the fabricator and made it a subsidiary thus causing him to have to buy his own design from a competitor?

Hehehe no easy questions about colored glass from me!

Design, as far as I know, always made the platter for Potts. The licensing arrangement on the original Balco occurred over 20 years ago and I really don't know the details of that; before my time with the company.

If there's anything going on now, it's really between the parties, isn't it? I don't know enough to speak from Ballantyne's side, and I certainly can't speak for Bob. Potts is still in business, his buying arrangement predates our acquisition of Design and still continues, and that's about all I know.

Now that wasn't so hard...

Pat

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