One of the mysteries of the English language finally explained.
A device for viewing a set of three monochrome photographs stereoscopically through red, green, and blue filters so that they are seen as a single appropriately coloured image. Compare "kromskop". Now historical.
Late 19th century (in an earlier sense). From photo- + chromo- + -scope.
In this article we explore how to impress employers with a spot-on CV.