The author died in 1930, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.
{{Information
|Description={{en|1="Registration by Photography of the Action Produced by N Rays on a Small Electric Spark"}}
|Source=http://www.rexresearch.com/blondlot/nrays.htm
|Author=Prosper-René Blondlot (1849-1930)
|Date=1904
|Permission={{PD-Old}}
Captions
The purported actions of the “N-ray”, later found to be illusory.