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2. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   The document camera is also called a desktop presenter unit or opaque projector. Opaque projectors are still in use for tracing, called tracing projectors. A flat or solid original is projected on a larger sheet of paper onto a wall or easel, where the artist or craftsperson can trace the outline reliably. [4] [5]

3. Vitascope - Wikipedia

   en.wikipedia.org/wiki/Vitascope

   Vitascope was an early film projector first demonstrated in 1895 by Charles Francis Jenkins and Thomas Armat. They had made modifications to Jenkins' patented Phantoscope, which cast images via film and electric light onto a wall or screen. The Vitascope is a large electrically-powered projector that uses light to cast images.

4. Camera obscura - Wikipedia

   en.wikipedia.org/wiki/Camera_obscura

   While the use of the camera obscura has waxed and waned, one can still be built using a few simple items: a box, tracing paper, tape, foil, a box cutter, a pencil, and a blanket to keep out the light. [82] Homemade camera obscura are popular primary- and secondary-school science or art projects.

5. Tracing (art) - Wikipedia

   en.wikipedia.org/wiki/Tracing_(art)

   A man using a light table to trace an image. Tracing is the act of copying an image or work of art by drawing over its lines, especially through the use of transparent overlays. [1] Tracing can provide a way for a person to develop their artistic skills for example when it comes to learning anatomy. It is however frowned upon in many art circles.

6. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .

7. Camera lucida - Wikipedia

   en.wikipedia.org/wiki/Camera_lucida

   Camera lucida in use. A camera lucida is an optical device used as a drawing aid by artists and microscopists.It projects an optical superimposition of the subject being viewed onto the surface upon which the artist is drawing.