Scioptic

CIDE DICTIONARY

Scioptic, a. [Gr. shadow + belonging to sight: cf. F. scioptique. See Optic.].

 Of or pertaining to an optical arrangement for forming images in a darkened room, usually called scioptic ball.  [1913 Webster]

Scioptic ball (Opt.), 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.