optical lantern

optical lantern

[′äp·tə·kəl ′lan·tərn]
(engineering)
A device for projecting positive transparent pictures from glass or film onto a reflecting screen; it consists of a concentrated source of light, a condenser system, a holder (or changer) for the slide, a projection lens, and (usually) a blower for cooling the slide. Also known as slide projector.
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