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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.
This saves time, since the transparency can be pre-printed and used repetitively, rather than having materials written manually before each class. The overhead is typically placed at a comfortable writing height for the educator and allows the educator to face the class, facilitating better communication between the students and teacher.
A teaching kit is a teaching resource developed by a museum education department with to create cross-curricular learning. Such kits often include many resources, such as an educators' guide, a CD-ROM with works of art and primary sources (letters, maps, period photographs), overhead transparencies, posters, curricula, and step-by-step lesson plans.
Specialised large-format slide projectors for large transparencies of 18 × 18 cm (7.1 × 7.1") or larger. [citation needed] Related devices: Overhead projectors, for page-sized transparencies; Slide viewer, for direct viewing of a magnified image of a slide
Opaque projectors are not as common as the overhead projector. Opaque projectors are typically used to project images of book pages, drawings, mineral specimens, leaves, etc. They have been produced and marketed as artists' enlargement tools to allow images to be transferred to surfaces such as prepared canvas, or for lectures and discourses.
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