Josh English wrote:
> I have wanted to experiment with building special viewers that force both
> eyes to look at two images at the same time, but I never got around to it.
I
> can't do the cross eyed technique myself, so I wanted to build a vieweing
box
> with a divider in the middle that seperates two images that would be
rendered
> like the green spiral on the site.

My Dad used to be a cartographer (drawer of maps), he had a pair of these
for looking at satellite photographs, the satellite returned long thin
pictures - north to south as I recall. On each orbit, the Earth rotates
slightly with respect to the satellite. By viewing the same object viewed
from two sequential orbits of the satellite, the terrain suddenly stands
out - mountains have height.

Anyway, the viewer looked neither complicated nor expensive, it was
basically a pair of glasses upside down - so they stand from the desk rather
than hanging from your ears. There was only a single lens in front of each
eye, and as far as I could tell, it seemed to be a simple magnifying glass.


--
Duncan Gray
(warning: may contain traces of nut)

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