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re:[OM] slide trays;

Subject: re:[OM] slide trays;
From: Dylan <dsut4392@xxxxxxxxxxxxxxxx>
Date: Wed, 29 Nov 2000 15:30:06 +1100
> Date: Mon, 27 Nov 2000 04:41:17 -0800
> From: William Sommerwerck <williams@xxxxxxxxxx>
> Subject: [OM] slide trays; inserting OM screens
> 
> Carousel trays are virtually jam-proof ("jamb" is a door frame) because the
> slide drops into place, and is only pushed when it returns to the tray. The
> straight trays "push" in both directions, and are more likely to jam or
> damage
> the slide. Anyone who tells you otherwise doesn't know what they're talking
> about.
> 
> The 140-slide Carousel tray gets its extra capacity by having narrower slots.
> These trays work best with thin glass or plastic mounts, or cardboard slides
> that haven't been "abused." The 80-slide tray are less critical. In either
> case, any slide that drops freely is almost certain to return without getting
> stuck.

I obviously don't know what I'm talking about, since I disagree;-).
Statistical analyses of the likelihood of slide jams with different
projection systems aside (if anyone actually has the numbers, come
forth...), I have seen nasty jams with kodak carousel trays on kodak
projectors. On one of those occasions, the fault appeared to be due to
something in the advance mechanism of the projector, and simply changing
projectors solved the problem (later found to be worn plastic gearing
inside the projector).
The other occasion was much more entertaining (though not for my poor
colleague who was presenting his doctoral research to a group of
international visitors), involving at least every second slide either
being shot up several metres in the air (they hit the ceiling) or
jamming in the machine. The presentation ended when one of his slides
terminally jammed inside the projector, preventing both advance to the
next frame and removal of the carousel. Trying to explain the strategy
behind his nested PCR approach to analysis of the gene promoter he was
studying was futile without the diagrams ("well, there's this A, then a
few C's and a G and a T, no wait, two T's...")
We later determined that the problem was, as William hints, the use of a
140 slide carousel. In this case the slides dropped freely, but were
somewhat less than certain to return the same way. Unfortunately one
doesn't always have a choice as to what carousel to use, or what mounts
the service bureau uses (presuming you even know there's a difference,
which most laypeople wouldn't).

OTOH, I have had no jams so far with my reflecta projector, using slides
of any thickness from the ultrathin CS mounts (in either the locking CS
trays or standard trays) to fatso bent old cardboard mounts. I've yet to
try it with a vertical carousel.
I've only had it a few years, and it hasn't seen heavy use, so YMMV.
Dylan

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