I'm thinking about buying a projector. I see the head suspended above the glass plate
can be at least of two varieties. One seems like a simple mirror and the other seems
like a headlight enclosure (called a closed head). Can anyone give me some idea what
that's about? For example, look at
<(Amazon.com product link shortened)>,
<(Amazon.com product link shortened)
Also see the 3M 1711, 1720 and 1730 on
<http://mpsuperstore.com/computer/group173.htm . Doublets? Open/closed heads?
Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
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