overheadkast
An overheadkast, also known as an overhead projector or overhead, is a device used to project images or text onto a screen from above. It consists of a light source, a lens system, and a translucent screen. The image is typically created on a transparency, which is a thin sheet of plastic or glass with the image or text printed on the reverse side. The transparency is placed on the stage of the overheadkast, and the light source illuminates it, projecting the image onto the screen below.
Overheadkasts were commonly used in educational settings, such as schools and universities, for presenting lectures and
The overheadkast was invented in the early 20th century and has undergone several iterations and improvements
Despite their decline in popularity, overheadkasts are still used in some educational and professional settings. They