N-ray

This article is about the hypothetical form of radiation described in 1903. For the genuine nuclear decay product, see neutron radiation.
Fig. 6,7 from Prosper-René Blondlot: "Registration by Photography of the Action Produced by N Rays on a Small Electric Spark". Nancy, 1904.

N-rays (or N rays) were a hypothesized form of radiation described by French physicist Prosper-René Blondlot in 1903. They were initially confirmed by others, but subsequently found to be illusory.