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From: ron@brl-tgr.ARPA (Ron Natalie )
Newsgroups: net.columbia
Subject: Re: IMAX and the Shuttle flights
Message-ID: <11604@brl-tgr.ARPA>
Date: Mon, 15-Jul-85 17:26:55 EDT
Article-I.D.: brl-tgr.11604
Posted: Mon Jul 15 17:26:55 1985
Date-Received: Thu, 18-Jul-85 07:36:56 EDT
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Organization: Ballistic Research Lab
Lines: 17

> I had thought maybe the rate at which the frames were shown was extremely
> fast or something (because of the comments on inertia, etc.), but it
> doesn't look that way since specks of dust on the film stay long enough to
> see them fairly well.
> 
Those specs are on a glass plate which is in direct contact with the
film.  The plate is slightly larger than twice the image size and there
is a little gizmo for sliding it back and forth while the projector is
in use to get a clean portion.  It is however manually operated.

For those who are around the Washington area, to get to the projection
room at NASM, go in and watch the movie.  As you are walking up to exit
the theater, use the right side aisle (house left).  There will be a closed
door on the left as you exit the theater.  Go through it, climb up the ladder
and there you are.

-Ron