Shadowgraph
From Tardis Wiki, the free Doctor Who reference
The shadowgraph was one of Nikola Tesla's inventions, whose name he included in his prototype of a word search game grid. (NOTVALID: Nikola Tesla's Word Search of Wonder)
Behind the scenes
- In the real world, the historical Nikola Tesla used the word "shadowgraphies" to refer to X-ray images of the human body, which he was among the first to take.
