Find the missing text [**** ***Y*]Background picture associated with the solution.
Correct answers: 35
The first user who solved this task is On On Lunarbasil.
Magic lantern slidesIn 1850, the first U.S. patent for magic lantern slides made of glass plate was issued to their inventor Frederick Langenheim of Philadelphia, Pa. (No. 7,784) as an "improvement in photographic pictures on glass."