Re: Unusual 3-D concept

[P3D Gerald Siegel <veritas@xxxxxxxxx>]

I think I can shed a wee bit of light on the questions posed by Sam Smith in
bobcat 1289 regarding Dewhurst and Francois Savoye.  Dewhurst was a
specialist in unusual prismatic arrangements that allow rotation of the two
stereo movie images so that a long rectangular picture (left image) could be
stacked, so to speak, over another long rectangular image(right image) on a
single strip of 35mm movie film.  He wrote an extensive series of articles
in the early fifties for the Bolex Reporter magazine.  Bolex, as you know,
marketed a beamsplitter, which used a separate tiny lens for each image-
thus avoiding keystoning but not the narrow width, laterally, of the screen
image.  In other words, Dewhurst sought the best of all worlds; wide screen,
single projector, and 3-D.  I never saw a demo of his prismatic
contraptions, only drawings, but the optical geometry and light loss must
have been something to reckon with.  Ah yes, Francois Savoye- Monsieuer
Savoye is pictured on pg 14 of Krause's little booklet " Three Dimensional
Projection'"< I can xerox and send you a photocopy of the page. > It shows a
free vision photo of his revolving aluminum bars which enclose a beaded
screen and do in fact seem to produce stereo sans glasses.  The catch: there
are zones of stereo vision every four degrees (implicit is the likelihood
that the other zones produced pseudostereo or Excedrin headache, or both.)
It is a variant of all the lenticular processes, which in my opinion are no
grat shakes.  Vectography, polarization analglyphs, were a more promising
development at the time, but didn't make it either...  C'est la guerre.  But
glad you asked, Sam.    Aloha Gerry


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