494 



Refraction. Total Reflection. 



No. 53 879 



53 880. 1 : 3. 



O 



53 886. 1 : 3. 



53881. 1:6. 



53 883. 1 : 7. 



53 884. 1 : 4. 



53 888. 1 : 5. 



53,879. Small Tube with Mercury, for demonstrating Total Eeflection (W. D., Fig. 290 [273]) 



. s. (1. 

 0. 4.0 



53,880. Small Tube with Cedarwood Oil, P i g u r e, for showing the disappearance of reflection 



at the edge of equally refractive media (W. D., Fig. 292 [275]) 0. 4. 



* 53,881. 2 Glass Plates with air gap, F i g u r e, for proving Total Eeflection (W. D., 



p. 378 [346]) 0. I. o 



* 52,590. Calladon's Apparatus for Total Reflection in a Jet of Water (Light Fountain): see 



Fig. 52590, p. 352) 2. 0. 



* 52,589. - - smaller and without base, see Fig. 52,589, p. 352 0. 16. 



53,882. Prism in which a vertical edge is cut away in the form of a vase. The figure appears, 

 by total reflection, as a hexagonal bodv with glistening silvery surfaces (M. P., 8 lh Edn., 

 II, 1, Fig. 80) 0. 5. 



* 53,883. Apparatus for Total and Partial Reflection in Glass Rods, after Hartl (Ztschr. f. d. 



phys. u. chem. U. 19, 1906, p. 134), Figure, with 1 bent rod of transparent glass 

 which reflects the entire light on a small screen, and two frosted glass rods which reflect 

 only a portion of the light; with stand 1. 5. 



53.884. 2 Rectangular Prisms of Plate Glass, Figure, 30 mm base and 30 mm height, j 

 on Stand, for showing the difference between ordinary reflection in glass and total reflec- 

 tion (M. P., 8 th Edn., II, 1, Figs. 77 and 78) . . * 1. 10. 



53.885. - - i d e m, 45 mm base-length and 45 mm height 2. 0. 



53.886. Glass Cube, after Rosenberg, for total reflection, Figure 0. 4. 



The light does not pass through two adjacent walls of the transparent cube. 



53.887. Glass Body after Kolbe, with two plane parallel surfaces, a refracting angle of 45 



and one of 60 0. 8. 



53.888. Glass Box for Total Reflection, after Hartl, Figure 0. 8. 



The box is half filled with water; the corrugated glass bottom appears of silvery brightness on 

 the upper surface when viewed from above, and as if the vessel were filled with ink, on the under 

 side. When viewed laterally the contents can be recognised as water. Looked at from the back, the 

 upper part seems darker than the lower, by virtue of total reflection, when the box is held up to a 

 strong light. 



53.889. Built-up Model of a Convex Lens and of a Concave Lens (Polyprism), after (irimsehl, 

 for demonstrating the path of the lays (/tschr. f. d. pliys. u. chem. V. 20, 1!H)7, p. 215). 

 consisting of two parallelepepedic glass vessels for filling with water, two similar vessels 

 of trapezoidal section, which can be built up together into lenticular bodies; 1 table 



stand for same and 1 stand with 4 mirrors for conducting the luminous rays ... 2. 14. 



53.890. Model of a Convex Lens, after Miililenbein. Figure, \\ith fixed and movable 

 coloured rods for demonstrating the path of the rays and the relations between object 



and image 1. 4. 



53.891. Model of a Concave Lens, after Miililenbein, same pattern as above I. I. 



C'l. 1316. 13-Jci, 



* Can be used with the Projection Apparatus. i;m, 3927, 1319, .v.:i. 



