The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope, which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope, which is capable of projecting images of both opaque and transparent objects.
The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope, which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope, which is capable of projecting images of both opaque and transparent objects.
Source: Wikipedia "Opaque projector" · CC BY-SA 4.0
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