No. 53 870. 



Refraction and Reflection. 



491 



53 866. 1 : 12. 



53 869. 1 : 6. 



. ,8. (1. 



18. 0. 



3. 0.0 



53.865. Universal Optical Apparatus after Bosenberg, Pigs. A and B (Ztschr. f. Instrumenten- 

 kunde 7, 1887, p. 323) 



It is possible to show with the apparatus all the laws of reflection and retraction on minors, 

 lenses and prisms as well as the splitting up of white light into the spectrum colours and the recorn- 

 position of the same. In addition, the microscope and the telescope can be explained with the apparatus. 



The upper part of the apparatus can be fixed on the frame in three different positions. 



Accessories: 2 Paraffin Lamps of special type; 1 plane Mirror; 1 concave Mirror ; 1 convex Mirror; 

 4 bi-convex Lenses of different focal length and diameter; 1 bi-concave Lens; 1 plano-convex Lens; 

 1 glass Cube; 1 Apparatus for proving reflection and refraction, Fig. B; 2 Prisms, one of these being 

 of flint glass. (For larger pattern apparatus see No. 53,867.) 



53.866. Auxiliary Apparatus for explaining the Measurement of the Velocity of Light by the 

 Fizeau and Foucault methods, Figure 



53.867. Universal Optical Apparatus after Bosenberg, larger pattern, 2 m higher 30. 0. 



53.868. Apparatus for Demonstration of the Refraction of Light in Glass and in a Glass Prism, 

 Figure 2. 10. 



On a stand is iixcd a divided circle, which is capable of rotation, and in the centre of wnich can 

 be fitted a semi-circular ground glass body or a prism of 30 mm side. 



53.869. Hollow Prism after Silbermann, Figure, for showing that the deflection increases 

 when the refractive angle increases (M. P., 8 th Edn., II, 1, Figs. 84 86) '. 



The prism can be filled with any aqueous, alcoholic or corrosive liquid, as it is cemented in the 

 fire. The box is rotary and has a graduation. 



53.870. Glass Plate for Refraction Experiments (M. T. p. 179), 2 cm thick, si/e 10x15 cm 0. 4.0 



Cl. 1313, 1315, 1293, 

 4671, 1294. 



3. 12: 



