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----- Original Message -----
From: "Ken Hunter" <atm_ken_hunter@...>

James,

I'm curious why you are sticking to a filament above the glass and
taking a risk of sputter damage or as before, drops of molten metal
hitting the glass?

The new 25" chamber will be in a vertical orientation, to avoid the above
mentioned problem!

In the mean time my 11" chamber, vertical coating is the only way to go
unfortuantly. On the plus side, I've never had a "Sputter" problem when
evaporating (Ie stuff Flying off the tungsten). With the existing 6 point
layout, drops of molten Al are also not a problem, as they would miss the mirror
(as long as I keep things realativly centered). Another odd thing is, since I
have 6 points, I don't have to put very much Al on each tungsten filament,
consequently I have NEVER had a drip problem with the new layout :)


Take Care,
James Lerch
(My telescope construction,testing, and coating site)

"Anything that can happen, will happen" -Stephen Pollock from:
"Particle Physics for Non-Physicists: A Tour of the Microcosmos"