No. 53849. 



Refraction and Reflection. 



485 



53 849 B. 1:10. 



53 849 A. 1:10. 



2 watch glasses, one with the convex and the other with the concave side facing outwards, allow the 

 phenomena to be demonstrated experimentally on spherical surfaces. The apparatus can be used 

 either with the light entering from the left or the right. 



53.842. - - idem, without Watch Glasses 



53.843. Light-Refraction Apparatus after Kepler (M. T. Fig. 133) 



53.844. Refraction and Reflection Apparatus, after Weinhold (W. D. Figs. 284, 285), after 

 the style of apparatus No. 53,849, casting the luminous rays in all directions . . . 



53.845. - - idem, aftei Grimsehl (Ztschr. f. d. phys. u. chem. U. 20, 1907, p. 214), with 

 glass vessel 



The apparatus can be used with the room half darkened. An arc lamp should be employed as 

 the luminous source. 



53.846. Rectangular Glass Vessel, Figure, for showing the curvilinear course of the rays 

 through a medium of unequal optical density, 1 in long 



53.847. Apparatus after Hartl for showing the curvilinear path of the rays through a medium 

 of unequal optical density, Figure (Ztschr. f. d. phys. u. chem. U. 9, 1896, p. 116) 



The apparatus can be filled in a few minutes; the. filling device consists of a funnel, a length 

 of tubing and a tube having a number of small apertures directed downwards and terminating in 

 the bottom of the apparatus. By means of this device the layers can be drawn off and kept for further 

 experiments. 



53.848. 10 Bottles, with Glycerine -Water mixtures for above, with 10 100% solutions . . 



53.849. Apparatus for Reflection and Refraction in Water, after Kolbe, Figs. A and B (Ztschr. 

 f. d. phys. u. chem. U. 19, 1906, p. 1) 



A glow lamp having a straight filament can be placed inside and above the vessel (surrounded 

 by corresponding slotted cylinders). 



Given in are 2 Half Cylinders and 3 Whole Cylinders with slots, also 2 white screens. Fig. 53,849 A 

 shows the path of the, rays in demonstrating Kemna's experiment on the refraction and reflection of 

 light when the light passes from water to air. Fig. 53,849 B when passing from air to water. 



Cl. 6003, 4694, 

 3831, 3830. 



. s. d. 



2. 2. 

 0. 16.0 



0. 16. 



1. 2.0 



1. 6.0 



2. 0.0 



0. 6.0 



3. 4.0 



1321, 



