photodrome

from The Century Dictionary.

• noun An instrument for producing optical effects by flashes of light thrown upon revolving disks on which are painted various figures or devices.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Physics) An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun dated An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes, the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.