N-Rays
A 1903 French scientific controversy where physicist Prosper-René Blondlot claimed to have discovered a new form of radiation (N-rays), later proven to be an observational error.
INVESTIGATION OVERVIEW
N-rays were a hypothesized form of radiation announced by French physicist Prosper-René Blondlot in 1903. Blondlot claimed N-rays were emitted by many substances and could increase the brightness of a faint spark. Over 100 scientists published papers on N-rays, and the French Academy of Sciences awarded Blondlot the Prix Leconte. American physicist Robert Wood visited Blondlot's laboratory in 1904 and secretly removed a key prism from the apparatus. Blondlot continued to report seeing N-rays even with the prism removed, proving the observations were subjective. The N-ray affair is one of the most famous cases of pathological science in history.
KEY CLAIMS
N-rays were a new form of radiation emitted by many substances
N-rays could increase the brightness of a faint electrical spark
The French scientific establishment accepted N-rays as genuine
N-rays were suppressed by non-French scientists due to nationalism
The phenomenon was a genuine discovery lost to scientific politics
SUPPORTING EVIDENCE
Over 100 papers on N-rays were published in French journals
The French Academy of Sciences recognized the discovery
Blondlot's experiments appeared to show consistent results
Other French scientists independently reported detecting N-rays
The phenomenon was only disproven when Wood removed the prism
COUNTER ARGUMENTS
Wood's 1904 demonstration proved N-rays were entirely subjective
No non-French scientist could replicate the results
The observations were due to expectation bias and poor experimental design
The N-ray episode is a textbook case of pathological science
No evidence of N-rays has ever been found under controlled conditions
TIMELINE
Blondlot announces discovery of N-rays
Wood visits Blondlot's lab and debunks the phenomenon
N-ray research collapses
KEY FIGURES
Prosper-René Blondlot
French physicist who claimed N-ray discovery
Robert W. Wood
American physicist who debunked N-rays
ORGANIZATIONS
University of Nancy
Academic
French Academy of Sciences
Academic
SOURCES
RELATED ENTITIES
PEOPLE
Prosper-René Blondlot
Robert W. Wood
ORGANIZATIONS
University of Nancy
French Academy of Sciences
EVENTS
Blondlot announces discovery of N-rays
1903
Wood visits Blondlot's lab and debunks the phenomenon
1904
N-ray research collapses
1904–1905