No. 54257. 



Reversal of Sodium Line. Spectrum Tables. Fluorescence. Phosphorescence. 



519 



54 239. 1 : 4. 



54 242. 1 : 7. 



54 244. 1 : 6. 



54 255/57. 1 : 3 



Collection of Fluorescent Liquids, Fig. 54,244, named, in wood frame with covers: 



List No. 54,243 54,244 54,245 54,243 



6 8 10 12 solutions 



0. 12. 0. 16. 1. 0. 1. 4. 



54,247. Fluorescent Liquids for filling troughs 100 ccm 



Quartz Lenses, bi-convex, radius of curvature 150 or 300 mm: 



List No. 54,248 54,249 54,250 

 Diameter mm 40 50 60 



0.12.0 1.0.0 1.10.0 



Geissler Tubes with Fluorescence Phenomena: see Section "Electricity". 



54.251. Apparatus for Demonstrating the Fluorescence Spectrum of the Electric Light, after 

 Stokes (M. P., 9 lh Edn., II, 1, Fig. 250), consisting of 2 quartz prisms of 30 mm side, 

 ground perpendicular to optical axis, two sides polished; 1 quartz lens 40 mm diameter, 

 IlO mm focal length, bi-convex ; and 1 Uranium glass plate 150 x 60 x 8 mm, on stand 



54.252. Violet Glass Plate 150 /. 150 mm, for Stokes's Experiment (M. P., 9 th Edn., II, 1, p. 360) 



54.253. Paper Strip prepared with barium platino -cyanide, 6 x 4 cm 



54.254. Fluorescent Portfolio, with barium platino-cyanide Writing, in portfolio of blue and 

 yellow glass 



Phosphorescence. 



Phosphorescent Substances, in case, Figure: 



List No. 

 



54,255 



3 

 0.5.0 



54,256 54,257 



5 7 substances 



0. 7. 0. 10. 



s. d. 



0. 2. 6 



8. 0. 



0. 6. 



0. 5. 



0. 5. 



Cl. 5215, 1443, 

 1444, 1445. 



