Do you mean a "mirrorscope?" According to information I found online, a mirrorscope is an "opaque projector known as an episcope; sometimes called a 'magic lantern.'"
An "episcope" is defined as an "optical device that projects an enlarged image of an opaque object, such as a printed page or photographic print, onto a screen by means of reflected light."
Additionally, Amazon.com lists a "3D Mirror Scope Illusion Creator" for sale (I believe it's used to create various and sundry holograms) and Apple has an app called "Mirrorscope ~ Magical Peephole" which is supposed to "produce various visual effects using the iPhone's built-in camera in real time."
Hope that helps!
Jkgrandma Thanks my friend found one in his garage it was made in Cleveland Ohio. I think it was made in the 20s. He was wondering if it was worth anything or not?