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2. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.

3. Penile-vaginal intercourse - Wikipedia

   en.wikipedia.org/wiki/Penile-vaginal_intercourse

   Penile-vaginal intercourse or vaginal intercourse is a form of penetrative sexual intercourse in human sexuality, in which an erect penis is inserted into a vagina. [1] Synonyms are: vaginal sex, cohabitation, coitus (Latin: coitus per vaginam), (in elegant colloquial language) intimacy, or (poetic) lovemaking.

4. Barrier-grid animation and stereography - Wikipedia

   en.wikipedia.org/wiki/Barrier-grid_animation_and...

   The Motograph Moving Picture Book was published in London at the start of 1898 by Bliss, Sands & Co. [4] It came with a "transparency" with black stripes to add the illusion of motion to the pictures in the book (13 in the original black and white edition and 23 in the later color edition). The illustrations were credited to "F.J. Vernay ...

5. Acid-free paper - Wikipedia

   en.wikipedia.org/wiki/Acid-free_paper

   The company Hercules Incorporated developed the first alkaline sizing in the 1950s that made acid-free paper possible. [10] Despite the advances in paper making and the identification of and concern around the brittle book problem, it took decades before the adoption of ANSI NISO Standard Z39.48-1984 - Permanence of Paper for Publications and Documents in Libraries in 1984.

6. Papermaking - Wikipedia

   en.wikipedia.org/wiki/Papermaking

   Handmade paper generally folds and tears more evenly along the laid lines. The International Association of Hand Papermakers and Paper Artists (IAPMA) is the world-leading association for handmade paper artists. Handmade paper is also prepared in laboratories to study papermaking and in paper mills to check the quality of the production process.

7. Paper vellum - Wikipedia

   en.wikipedia.org/wiki/Vellum

   Paper vellum has also become extremely important in hand or chemical reproduction technology for dissemination of plan copies. Like a high-quality traditional vellum, paper vellum could be produced thin enough to be virtually transparent to strong light, enabling a source drawing to be used directly in the reproduction of field-used drawings. [24]