P3D Re: RBT mounts

[Paul Talbot <ptww@xxxxxxxxx>]

Linda Nygren wrote:
> 
> From my own observations, I think that having the black side of the RBT
> mount toward the observer seems to work the best in my Red Button
> viewer,

I agree with that assessment, but there is not unanimous agreement
on the issue.

> but I wonder if there is a "correct way" to do it, or if the
> best way for projection would be different than the best for a viewer?

Yup, for projection it is definitely best to have the white
toward the lamps.  DrT did some temperature measurements
some time back.  I wish I could recall the best key words
to find the discussion in the archives.  It started with
someone using toast, toaster, burn, melt, or something like
that.  (BobW, do you have the automatic synonym and fuzzy
logic search features up and running yet?  ;-) )

> Also is there an up and down on the mount?

I've always treated the edge with the horizontal line as
the top, but I've never heard/seen anything official about
this.

> It looks like perhaps it only makes a diference 
> on the 4p, but I am not sure, again, whether there is
> a "correct" or conventional way to do it.

I haven't measured, but I'd be a little surprised if I were
to find that the windows aren't centered vertically.  If they
are not, my thinking would be the window would be better above
the center line than below.  What did you see to suggest the
4P has a top and bottom?

> I am also trying to figure out what kind of labels to put on these. (In
> the past I have written directly on cardboard mounts, and I usually
> pencil in date and subject preliminarily, as well as marking my better
> ones with asterisks.) -Linda

I think most people use Avery-type labels.  You might be able
to pencil something on the white side.  I usually use stick-on
spotting dots to mark my "better" slides.

Paul Talbot