An optical instrument or device used to observe or examine transparent or translucent objects, or to project images onto a surface using transmitted light.
From Greek 'diaphanês' (transparent) + 'skopein' (to look at or examine). This scientific instrument term developed in the 19th century from the combining of optical principles.
The diaphanoscope was like the steampunk ancestor of the overhead projector—scientists and artists used it to enlarge and examine tiny transparent specimens or to create magical projected images before electricity made everything easier.
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