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Rubylith consists of two films sandwiched together. The bottom layer is a clear polyester backing sheet; the top layer is a translucent, red-(ruby-)coloured sheet. The top layer can be cut and peeled away from the bottom layer.
For IC production in the 1960s and early 1970s, an opaque rubylith film laminated onto a transparent mylar sheet was used. The design of one layer was cut into the rubylith, initially by hand on an illuminated drafting table (later by machine ()) and the unwanted rubylith was peeled off by hand, forming the master image of that layer of the chip, often called "artwork".
Appeldorn developed a process for the projection of transparent sheets that led to 3M's first marketable transparency film. The Strategic Air Command base in Omaha was one of the first big clients, using circa 20,000 sheets per month. 3M then decided to develop their own overhead projector instead of the one they had been selling until then ...
With the new technology, lenses are printed in the same printing operation as the interlaced image, either on both sides of a flat sheet of transparent material, or on the same side of a sheet of paper, the image being covered with a transparent sheet of plastic or with a layer of transparent, which in turn is printed with several layers of ...
Barrier-grid animation or picket-fence animation is an animation effect created by moving a striped transparent overlay across an interlaced image. The barrier-grid technique originated in the late 1890s, overlapping with the development of parallax stereography ( Relièphographie ) for 3D autostereograms .
A punched pocket can contain only a small number of paper sheets. Often there is only one sheet per pocket. Sometimes a punched pocket contains two sheets, each with one-sided text outward. One can see attached punched pockets, each containing a page with some information, in some banks, post offices and polyclinics.
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