BIBLIOGRAPHY OF SELENIUM 251 



Ries, Chr. (Dissertation, Erlangen, 1902), The electrical be- 

 havior of metallic selenium with light and temperature 

 changes. 



Uuhmer (Elektrotech. Zeits., 23, 859), Light telephony. 



Fullmer (Phys. Zeits., 3, 468), The light-sensitiveness and fa- 

 tigue of selenium cells. 



Ruhmer (Phys. Zeits., 3, 532), Cylindrical selenium cells. 



Uuhmer (Tech. Eundsch., 1902, 339) (Elek. chem. Zeits., 9, 98), 

 A new light-sensitive cell. 



Uuhmer (Mechaniker. 1902, p. 185), The telautograph. 



Uuhmer (Monograph pub. by "Der Mechaniker"), Selenium 

 and its application, with special reference to wireless tele- 

 phony. 



Uuhmer (Zeits. f. Phys. u. Chem. Unt., 15, 12G), Apparatus for 

 demonstrating light action in selenium. 



Simon Th. and Reich (Phys. Zeits., 3, 278), Musical arcs and 

 light-telephony. 



Wood (Phil. Mag.. [6], Vol. 3, p. 607), The refraction and ab- 

 sorption coefficients of selenium. 



1903 



Anzel (Zeits. f. Elektrochem., 9, 695), The change of resistance 

 by light in other materials than selenium. 



Aubel (Compt. Rend., 136, 1189; and Phys. Zeits., 4, 808). The 

 action of ozone-treated bodies on the conductivity of selen- 

 ium. 



Aubel (Compt. Rend., 136, 929, and Phys. Zeits., 4, 807), The 

 action of radioactive bodies on the conductivity of selen- 

 ium. 



(i ill (ID (Phys. Zeits., 4, 287), Improved apparatus for demon 

 strating the light-sensitiveness of selenium. 



Griffiths (Compt, Rend., 137, 647), Change of resistance of 

 selenium under the action of certain substances. 



Hammer (Trans. Am. Inst. Electr. Eng., 20, 541). The proper- 

 ties and uses of selenium. 



Eesehus (Journ. d. Russ. phys.-chem. Ges., 35, 661), Relation 

 of electrical conduction to illumination. 



