BIBLIOGRAPHY OF SELENIUM 259 



Htebbins (Astro. Phys. Journ., 34, 105-130), The discovery of 



eclipsing variable stars. 



1912. 



Amaduzzi (Phys. Zeits., 13, 165), The Hallwachs effects in se- 

 lenium. 



Fournier d'Albe (Proc. Roy. Soc., 86, pp. 453-461), The varia- 

 tion of resistance with voltage. 



Fournier d'Albe (Proe. Roy. Soc, 13, 942), Application of se 

 lenium to seeing, the Optophone. 



Brown (Phys. Zeits., 13, 689; and Proc. Iowa Acad. Sci., 1912), 

 The effect of abrasion on the electrical conductivity of se- 

 lenium. 



Brown (Phys. Rev., 34, 403), The effective depth of penetra- 

 tion of selenium by light. 



Glatzel (Verb. d. D. Phys. Ges., 14, 607-623), Light sensitive- 

 ness of selenium. 



Korn and Glatzel (Hand. d. Phototel. u. Teleautogr.), The light- 

 sensitiveness of selenium. 



Grippenberg (Phys. Zeits.. 13, 161 and 168), Selenium plates. 



Kaempf (Phys. Zeits., 13, 689), Saturation currents in selenium. 



Olie and Eruyt (Sc. Abs., 15, abs. 903, 1912), Photo-electric 

 properties of antimonite. 



Pfund (Phys. Rev., 34, 371-380; and Phys. Zeits.. 13, 507), The 

 application of selenium cells to photometry. 



Pochettmo (N. Cim., (6) 4, 189-203). The cause <>!' the Light- 

 sensitiveness of selenium. 



Stebbins (Astro. Nachr., 192, 190-194), The Lighl variation of 

 Ursa Minor. 



Zoltan (Phys. Zeits., 13, 1912), The Eallwachs effed in se 

 lenium. 



Grippenberg (Phys. Zeits.. 13, 686), Selenium cells of high 

 sensibility. 



1913. 



Fournier d'Albe (The Electrician, 72, 102; and Sc. Am.. 93, 

 467), The type-reading optophone. 



