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. Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors. Care must be taken that the materials are not damaged by the heat generated by the light source. Opaque projectors are not as common as the modern "overhead". Opaque projectors are typically used to project images of book pages, drawings, mineral specimens, leaves, etc. They have been produced and marketed as artists’ enlargement tools to allow images to be transferred to surfaces such as prepared canvas, or for lectures and discourses.
The numerical value of opaque projector in Chaldean Numerology is: 4
The numerical value of opaque projector in Pythagorean Numerology is: 6
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"opaque projector." Definitions.net. STANDS4 LLC, 2017. Web. 24 Nov. 2017. <http://www.definitions.net/definition/opaque projector>.