No. 53 858. 



Refraction and Reflection. 



487 



53 855. 1 : 7. 



53 857. 1 : 5. 



* 53,854. Optical Demonstration Apparatus, after Stromann, Figure (Ztschr. f. d. phys. u. s - d - 

 chem. U. 18, 1905, p. 71), for demonstrating various fundamental laws relative to ; 

 the theory of light j 8. 0. 



The following can be proved: Refraction of light; Reflection on Plane and Cylindrical Surfaces; 

 the Bounding Angle and Total Reflection; the passage of the rays through plane parallel plates ; through 

 plano-convex and bi-convex lenses; Polarisation; the warped band of light; Total Reflection in a jet 

 of water; the various properties of refraction possessed by different coloured lights; Chromatic Ab- 

 erration and combination; the Curvilinear path of the rays in a substance of varying density, etc. etc. 



*.">;?, 855. Apparatus for the Laws of Refraction, Reflection, Total Reflection, etc., Figure 4. 0/0 



In the centre a mirror can be introduced for experiments on reflection, or a lens for demonstrating 

 the path of rays in lenses. 



* 53,856. - - idem, with Perfect Circle 



* 53,857. Reflection and Refraction Apparatus, Figure 



The semi-cylindrical glass vessel can be replaced by a plane mirror. The circle is 30 cm diameter 

 and carries two alidades for measuring the angles, and two graduated sliding rules for directly de- 

 termining the sines. 



53,858. Reflection and Refraction Apparatus after Silbermann, Figure 8. 0. 



ci. 



4. 12. 

 5. 10. 



* Can be used with the projection Apparatus. 



4174, 

 3389,5880, 1290. 



