No. 53 878 b. 



Light Refraction Apparatus. 



493 



53 876. 1 : 5. 



53878. 1:8. 



53 878 a. 1:9. 



53.871. Light-Refraction Apparatus after B. Kolbe (Ztsehr. f. d. phys. u. chem. U. 9, 1896, d. 

 p. 20, and 13, 1900, p. 9), Figs. A and B, diameter of glass disc 360 mm ..... 9. 10. 



When using parallel light experiments can be made with the apparatus on reflection on plane 

 mirrors, refraction of the light when the rays pass from the thin into the denser medium and vice-versa 

 (air-glass, glass-air, water-air, etc.), total reflection, refraction in plane parallel glasses, minimum of de- 

 flection, refraction in prisms and lenses, reflection on cylindrical mirrors. 



The apparatus consists essentially of a ground glass disc capable of rotation in rollers, provided 

 with a suitable sine graduation and carrying a spring clip in order to easily interchange the light- 

 refracting bodies. The following are given in with the apparatus: 1 Screen with two diaphragms; 

 1 cardboard Disc with marked degree graduation; 4 Diaphragms with 1, 3, 7 and 9 gaps; 1 Reflecting 

 Mirror; 1 solid half -cylinder of Glass; 1 hollow half-cylinder of Glass; 1 flint Glass Prism; 1 Glass Block; 

 1 cylindrical Cendensing Lens and 1 cylindrical dispersion Lens each 60 mm focus ; 1 concave and 1 con- 

 vex Mirror each 100 mm radius of curvature; 1 Glass Body with two plane parallel surfaces and a 

 refracting angle of 45 and one of 60. 



53.872. - - idem, with glass disc 240 mm diameter 8. 0. 



53.873. Light-Refraction Apparatus after Reusch, movable (W. D. Fig. 289 [272]) .... 1. 4.0 



* 53,874. --idem, for the Projection Lantern, Figure 0. 16. 



53,875. Light-Refraction Apparatus after Pfaundler (M. P., 9 lh Edn., II, 1, Figs. 46 and 47), 



for demonstrating the minimum deflection in the prism 2. 0. 



* 53,876. Apparatus for Refraction in Plane Glasses, Figure, for showing the apparent 



displacement of the object by moving a plane parallel plate in front of an object . 0. 6. 



53.877. Niemoller's Apparatus for the Mechanical Demonstration of the Law of Refraction, 

 Figure (Fr. phys. Techn. I, 2, Fig. 2212; Ztsehr. f. d. phys. u. chem. U. 5, 1892, 



p. 139) 1.16.0 



Wood Protractor on Stand, Fig. 51,491, p. 229, after Friedr. C. G. Miiller (M. T., Figs. 6, 14, 



15), for measuring angles in mechanics and optics 2. 10. 



53.878. Collection of Apparatus for Demonstrating the Laws of Reflection and Refraction, 

 Figure, in box | 7. 0. 



1 Plane Mirror 100 mm diameter; 1 Concave Cylindrical Mirror 90 mm diameter; 1 Convex 

 Cylindrical Mirror 90 mm diameter; 1 Convex Lens 100 mm diameter; 1 Flint Glass Prism 45 mm 

 side; 1 Water Trough, 1 Ground Glass Screen. 



53,878 a. Refraction Apparatus after Stahlberg (Ztsehr. f. d. phys. u. chem. U. 15, 1902, p. 69), 



Figure, on stand with one tube each for water and benzol 3. 0. 



This apparatus is constructed after the style of the Reusch light-refraction apparatus. It can 

 be adjusted for the refraction-ratio 4 : 3 (air to water) and 3 : 2 air to glass and air to benzol) and 

 can be used with the light penetrating either from the right or left. 



53,878 b. Light-Refraction Apparatus after Stahlberg, exactly as No. 53,878 a, but without 



benzol tube . 2. 15. 



* Can be used with the Projection Apparatus. 



Cl. 5794, 1355, 1291. 



