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The epidiascope is a forerunner of the overhead projector.

They display materials such as book pages, drawings, specimens and leaves by shining a bright lamp on to the object from above.

A system of mirrors, prisms and lenses focuses an image of the object on to a screen.

Because they must project the reflected light epidiascopes need brighter bulbs and larger lenses than overhead projectors

Epidiascopes have been used as artists' enlargement tools, to allow images to be transferred to surfaces such as prepared canvas, or for lectures and talks.

In the early and mid-1990s they were also produced and marketed as toys for children.
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Title Annotation:Business
Publication:Huddersfield Daily Examiner (Huddersfield, England)
Date:Apr 14, 2007
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