Thaumatrope
From Wikipedia, the free encyclopedia.
A thaumatrope is a toy that was popular in Victorian times. A disk with a picture on each side is attached to two pieces of string. When the disk is spun quickly the two pictures appear to combine into a single image due to the optical property known as persistence of vision.
The invention of the thaumatrope is usually credited to John Ayrton Paris, an English doctor, who used one to demonstrate persistence of vision to the Royal College of Physicians in London in 1824. He based his invention on ideas of the astronomer William Herschel and the geologist William Henry Fitton, and some sources attribute the actual invention to Fitton rather than Paris. Others claim that Charles Babbage was the inventor.
Examples of common thaumatrope pictures include a bare tree on one side of the disk, and its leaves on the other, or a bird on one side and a cage on the other. They often also included riddles or short poems, with one line on each side.
Thaumatropes were one of a number of simple, mechanical optical toys that took advantage of persistence of vision. They are recognised as important antecedents of cinematography and in particular of animation.
