P3D Re: PHOTO-3D digest 3784-(xograph)

[INRESLAB@xxxxxxx]

"Xograph" was the trade mark/term used for the first lithographically 
reproduced lenticular prints from Visual Panographics (Cowles 
Communications/Look Magazine) in the mid-'60's. This outfit later became 
Optigraphics. If you can locate any of the Kellog's ball cards from the 
'60's-70's, you will find this term on the back of the card.

In scientific equations, the Greek "X" is used to signify "parallax" ( much 
as -theta is used to signify "angle") so they coined this term to represent 
parallax photography. FYI the pronunciation is " X - ograph"

Scott