48 "N RAYS 



On the Property of emitting "N" Rays, which is 

 conferred on Certain Bodies by Compression, 

 and on the Spontaneous and Indefinite Emis- 

 sion of "N" Rays by Hardened Steel, 

 unannealed Glass, and other Bodies in a 

 State of Strained Molecular Equilibrium 

 (December 7, 1903). 



Professor A. Charpentier kindly undertook 

 to keep me informed with regard to the pro- 

 gress of certain researches of a physiological 

 nature which he is conducting in connection 

 with " N " rays, unpublished researches which 

 (note n) promise highly interesting results. 

 These experiments led me to the idea of exam- 

 ining whether certain bodies did not acquire, by 

 compression, the property of emitting " N " rays. 

 For this purpose I compressed, by means of a 

 carpenter's press, bits of wood, glass, rubber, 

 etc., and I immediately observed that these 

 bodies had in fact become, during the com- 

 pression, sources of " N " rays ; brought near a 

 mass of phosphorescent calcium sulphide, they 

 increased its luminosity ; and they can also be 



