nPhotoscope(Physics) Anything employed for the observation of light or luminous effects.
Century Dictionary and Cyclopedia
nphotoscopeAn instrument or apparatus for exhibiting photographs.
nphotoscopeAn instrument consisting of a selenium-cell, or an arrangement of some other substance whose electrical resistance varies with the degree of illumination, together with a telephone-receiver placed in the same electrical circuit, by means of which the varying intensities of light may be detected.
Webster's Revised Unabridged Dictionary
Photo-, + -scope,
Phantoscopes, Bioscopes, Photoscopes, and many other instruments followed in quick succession.
"The Romance of Modern Invention" by Archibald Williams