P3D Re: LCD lenses in T-Rex

["William Carter, Ph.D." <wc@xxxxxxxxxxxx>]

At 03:04 AM 12/28/98 -0700, Marvin Jones wrote:

>Liquid Crystal lenses work like the LCD numbers on your watch, going either
dark
>or clear according to a tiny pulse. 

It might be helpful to note that the "liquid crystal", in and of it's self,
only alters polarization. A polarizing filter must be the first filter
element. The "liquid crystal" then alters that polarization, depending upon
an applied potential.. usually +/- 5v.., and after that there's the analyzer
at the aft end. In this scheme, polarization becomes either crossed, or
un-crossed, depending upon the applied voltage; either "opaque" or "clear".


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