kalotrope

Noun

kalotrope (plural kalotropes)

1. A device invented by Thomas Rose that produces the optical illusion of transforming images by means of two concentric wheels moving in opposite directions.
   • The kalotrope exhibits to an entire company the well-known illusions of the Thaumatrope, but its claims to be considered a perfectly new optical arrangement rest in a peculiarity of action by which a number of illusive changes are brought over any one disc of devices.1858, The Annual of Scientific Discovery, Or, Year-book of Facts, page 238
   • For the true kalotrope effects the two wheels are used; and in 1855 the inventor was kind enough to give the writer the following valuable information with regard to the discs to be used and devices best adapted to the kalotrope. the inner disc has images and the outer disc has slits through which...1858, The Popular Educator: A Complete Encyclopedia of Elementary, Advanced, and Technical Education, Volume 6, page 194