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Re: Thermal glass problems
>>piece that was supposed to be a whole piece. Annealing glass is a complete
>>science in an of itself. You gotta gauge for this one, Morgan <g>.
>
>I actually do! A polariscope. You can buy them, but I made mine from two
>sheets of polarized film and a piece of frosted glass. It's invaluable
>when doing repairs on clear glass units someone else made. Lots of strain
Never thought to do it on other people's glass. Neat idea!
>usually means the unit will splinter when you try and cut off a 'trode. A
>quick anneal in that case saves lots of heartbreak.
>
>It's also a great way to learn about stress in neon glass.
>
> -John
>
John, I think you get the award for the first sucessful ascii drawing of 1996!
Kenny
>
>Make a polariscope yourself:
>
>
>
> ---------------------------- polarized sheet (camera store)
>
>
> ======================= <---- clear neon glass
>
>
> ---------------------------- polarized sheet
> __________________________________ (positioned perpendicular to the
first)
> (frosted glass, white plex)
> ^^^^^^^^^^^^^^^^^^^^^^^
> light source
> (a loop of 6500 white works great!)
>
>
>I have about a 6" space between the two sheets, which are sandwiched
>between glass for durability. If the two polarizing sheets are
>perpendicular, then they cancel out the light from below. Strain in glass
>defracts this light, showing up as bright-white streaks & patterns.
>
>
>
>
Kenny Greenberg Neon Artist, Scenic Specialist, Columnist - Internet World
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