An epidiascope is a device used to project images of both opaque and transparent images, typically used to project images of book pages, drawings, mineral specimens, leaves, etc. An example of a large epidiascope. This device was used to show mounted glass slides in lectures and colloquia.

What is epidiascope in teaching?

The epidiascope is an optical device for projecting a magnified image of both transparent and opaque objects onto a screen. The epidiascope is comprised of an episcope and a diascope. In the epi-position, it can project opaque and flat objects such as textbooks, journal pages and drawings.

What does an episcope do?

The opaque projector, epidioscope, epidiascope or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. A system of mirrors, prisms and/or imaging lenses is used to focus an image of the material onto a viewing screen.