Photographer's Device for Viewing Negatives
This page is the CodyCross answer for the clue below from Water Park, Group 741, Puzzle 1 (Swimming Pools).
Question is: Photographer's Device for Viewing Negatives
and the answer is: LIGHTBOX
Word Meaning:
LIGHTBOX — A box containing a source of light and a white, translucent cover, used to view photographic transparencies.
Definitions from Wiktionary.