Judged: two independent readers; copy check clear.
stroboscope
stroboscope A stroboscope is a device that creates the appearance of continuous movement by letting the viewer see a rapid series of slightly different pictures in brief glimpses, usually through slits in a rotating card or cylinder.
A stroboscope is a device that creates the appearance of continuous movement by letting the viewer see a rapid series of slightly different pictures in brief glimpses, usually through slits in a rotating card or cylinder. Historical forms include the phenakistoscope and zoetrope.