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added Hilgartner ref
=Visibility of X-rays=
Some references for the visibility of X-rays to the naked eye:
Some references for the visibility of X-rays to the naked eye:
Lipetz, L. E.: Electrophysiology of the x-ray phosphene, Radiation Res. 2: 306, 1955.
Lipetz, L. E.: Electrophysiology of the x-ray phosphene, Radiation Res. 2: 306, 1955.
=X-rays and the Blind=
Science mentions the report of Hilgartner and Northrup in Texas:
FREDERIC W. SIMONDS, "THE TEXAS ACADEMY OF SCIENCE" Science 30 April 1897 5: 703-704 [DOI: 10.1126/science.5.122.703-a] (in Articles)