alethoscope

== English == === Etymology === From Ancient Greek ἀλήθεια (alḗtheia, “truth”) +‎ -scope, equivalent to aletho- +‎ -scope. === Noun === alethoscope (plural alethoscopes) (historical) An instrument, invented in the 1860s, for viewing magnified pictures by means of a single lens inside a box. By varying the intensity of the light, the same picture can be shown as "daytime" or "nighttime". ==== Derived terms ==== === References === “alethoscope”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.