magnascope
/ˈmaɡnəskəʊp/Film. Now historical
noun
A device for temporarily enlarging the picture on the cinema screen during a film, using a wide-angle magnifying lens system attached to the projector, and a screen of variable size or position; the process or technique of using this device, an early form of widescreen projection.
Origin
1920s; earliest use found in The New York Times. From magn- + -a- connective + -scope.