[photo-3d] Unusual stereoview card format

[Ralph Johnston/Linda Sherman <copley@xxxxxxxxxxxxxxx>]

I just uploaded a scan of an SV card with two pairs of photos of cats
(which I collect and just bought on e-Bay).  But this one has small real
photos with two different spacings, 73mm and 69mm and is billed as "AN 28
(35450) Keystone Eye-Skill Training Series".

Point your Navigator/Explorer to:


http://www.egroups.com/files/photo-3d/cats+Keyston+eye-skill.jpg

These appear magnified x2 on my 768 x 1024 screen so you won't be able to
view them without an "Alan Lewis Freeviewers Assistant" viewer.  The
VueMagic PV6x6 side-by-side viewer also works but not as well because the
spacing a not quite large enough.

There is a "|" on the left image and a "-" on the right which should appear
as a "+" when you have your eyes adjusted properly for viewing.

Question?  Are you supposed to view this card without a viewer?  At what
distance?  Maybe with magnification only -no prism?
Is this for people with crossed or wall eyes?  The text on the back refers
to a "Telebinocular" and a "Stereoscope at 0.6 delta".

Hope someone can help me out.

Regards -Ralph
*****************************************************************
*   Linda Sherman/Ralph Johnston
*   WEB PAGES http://www.ultranet.com/~copley/
*      1) Photo Historical Society of New England
*      2) Stereo New England
*      3) Auburndale Community Association
*   617-527-7562, 617-969-2760fx
*****************************************************************

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