486 



Refraction. Total Reflection. 



No. 53 850 



53 850. 1 : 7. 



53 851. 1 : 6. 



53852. 1:6. 



53 853. 1 : 5 



#53,850. Light-Refraction Apparatus, after Tyndall (Tyndall's Drum), Figure, for objective i. d. 



demonstration (M. P. II, 1, Fig. 31 [26]) 



A cylindrical metal vessel 300 mm diameter can rotate about a polished wood base. In front 

 of a gap a mirror is fitted wth the aid of which a ray of light may be made to penetrate at various 

 angles, according to the rotation of the vessel. The water is coloured with a fluorescent liquid; the ail- 

 space being filled with smoke. 



# 53,851. --idem, Figure, with a second Mirror and Gap underneath, for 1ot:il reflect ion 



I 



* 53,852. Light-Refraction Apparatus after Mach, Figure (M. P. 8 lh Edn., II, 1, Figs. 64 



and 65; Carls Repertorium 7, 1871) 



Tiie illustration shows the apparatus from the back, with the device for reflecting the luminous 

 pencil. Tue front of the \csscl is glazed. 



* 53,853. Apparatus for Determining the Refractive Indices of Liquids, after Bliimd, F i - u i < 



(Xtschr. f. (1. phys. u. clicni. I". 2, 1888/9, p. 163) 



The apparatus con<ist> "I a vessel with plale glass walls, and a graduated disk oflJennan silver. 

 about the centre of which 2 levers can rotate. Two rules permit of reading the sine of the incident 

 and refractive angle. The apparatus is arranged for subjective and objective demonstration. 



* Can be used with the Projection Apparatus. 



CI. 1285, 3952, 

 5066, l.".cj. 



2. 0.0 



2. 10.0 



3. 0. 



2. 8. 



