Figure 2. The anatomy of a Parallax Barrier. (Roberts, 1992)
The Parallax Stereogram (Figure 1 and 2.) was made up of three elements: (1) a barrier-masking screen, which consisted of vertical opaque lines, separated by clear slits of lesser width. (2) A transparent glass plate behind the barrier screen which created spacing between it and (3) the photographic emulsion that consisted of the picture information divided into fine mosaic image stripes aligned behind each clear aperture.