01 a. Of or pertaining to an optical arrangement for forming images in a darkened room, usually called scioptic ball.
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1.
Of or pertaining to an optical arrangement for forming images in a darkened room, usually called scioptic ball.(Opt.)
Phrases & compounds
Scioptic ball —
the lens of a camera obscura mounted in a wooden ball which fits a socket in a window shutter so as to be readily turned, like the eye, to different parts of the landscape.