Re: [photo-3d] Digest Number 13

["Dan Shelley" <dshelley@xxxxxxxxxxxx>]

From: "Dan Shelley" <dshelley@xxxxxxxxxxxx>

><< As best as I can tell, there is no universal agreement as to why
> the curved mount was adopted. Some think the reasons you mention,
> while it may be that the thought was that a curved mount made the
> image look more "3D" >>
>
>Actually, I think there may be a very practical reason, illustrated in a
>old stereo view posted not long ago (I think by Dan Shelley) of a
>Keystone production line.  It showed stacks and stacks of view cards,
>all curled. In my experience, with my flat cards, I can stack them only
>about 20 high before they begin to slide, or at least become unstable.
>Curved cards are as stable as lego blocks, no matter how high they
>are stacked.  Could it be the curve is simply a matter of manufacturing
>expediency???

This is the picture Jim has made reference to: (at least I think it is...)

http://www.dddesign.com/3dbydan/apec/cards1.jpg

Here is another that also shows stack of views:

http://www.dddesign.com/3dbydan/apec/cards2.jpg

I am not sure that they are of a Keystone factory however - even though I
might have said that in the past - I will follow up on that. I have had
these pictures on my site to add to the APEC material already there for
quite some
time now... ;-)

Good theory Jim. I think it might be a combination of Thom's ideas and this
one as well.

Dan





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