A chromatrope is a type of

magic lantern The magic lantern, also known by its Latin name , is an early type of image projector that used pictures—paintings, prints, or photographs—on transparent plates (usually made of glass), one or more lenses, and a light source. Because a si ...

slide that produces dazzling, colorful geometrical patterns set in motion by rotating two painted glass discs in opposite directions, originally with a double pulley mechanism but later usually with a rackwork mechanism. The chromatrope was probably invented in the year 1841 (or slightly earlier) by English glass painter and showman

Henry Langdon Childe Henry Langdon Childe (1781–1874) was an English showman, known as a developer of the magic lantern and dissolving views, a precursor of the dissolve in cinematic technique. While the priority question on the technical innovations Childe used i ...

, by which year it was listed in the

Royal Polytechnic Institution , mottoeng = The Lord is our Strength , type = Public , established = 1838: Royal Polytechnic Institution 1891: Polytechnic-Regent Street 1970: Polytechnic of Central London 1992: University of Westminster , endowment = £5.1 million ...

catalogue. It was added as a novelty to the program of the Royal Polytechnic Institution, which had previously included many other types of magic lantern shows with moving images, such as

phantasmagoria Phantasmagoria (, also fantasmagorie, fantasmagoria) was a form of horror theatre that (among other techniques) used one or more magic lanterns to project frightening images, such as skeletons, demons, and ghosts, onto walls, smoke, or sem ...

and

dissolving views Dissolving views were a popular type of 19th century magic lantern show exhibiting the gradual transition from one projected image to another. The effect is similar to a dissolve in modern filmmaking. Typical examples had landscapes that dissolv ...

. The principle and the effect of the chromatrope is similar to that of the feux pyriques that had gained some popularity in rich North European households at the end of the 18th century. The resulting abstract and everchanging image is also very similar to that of the

kaleidoscope A kaleidoscope () is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle, so that one or more (parts of) objects on one end of these mirrors are shown as a regular symmetrical pattern when v ...

, which had caused an enormous international craze in 1818.

References

Optical toys {{toy-stub