416 



Wave Motions. 



53175. 1:7. 



53 176 B. 1:12. 



53 177 a. 1:7. 



53,174. Wave Machine after Fessel and 1'liicker, F i g u r e, with a number of wave troughs; 



can he used .simultaneously for demonstrating double refraction 



53,175. Wave Machine after Christian!, Figure (W. D. Fig. 190 [175]), for imitating 



aqueous waves. The mechanism is visible, being closed in by glass plate 



s. d. 

 16. 10. (I 



5, (i. o 



4. 0. 



53,176. Wave Machine after Wheatstone (M. P. I, Figs. 607 and 608 [636 and 637J), with 

 three different waves on one stand, 1 m long, Figs. A and B 



* 53, 177. Projection Wave Machine, cf. Fig. 53,1 77 a, with four round and two rectangular 



photographed discs; without box _'. o. u 



The round discs demonstrate (1) the reflection of the elementary repulsion in a closed tulie; 

 (2) the progressive longitudinal wave; (:i) the stationary longitudinal wave. i. e. the wave motion in an 

 open tube, which gives its fundamental tone; and (4) the stationary wave in a tube dosed on one side. 

 which gives the first o\er tone' (twelfth) of the fundamental tone. 



The rectangular discs arc used for demonstrating the reflection of a single wave at the closed 

 and open end of a tnlic. 



*53,177a. -- idem, Figure, with 1>"\ for keeping the glass discs in 



* 53, 1 78. Wave Machine after ( 'ro va, Figure (M. I>. II, 1. Fig. 1<I3|~'71|; Fr. phys. Teclm. 



I, 2, Fig. 310!t | I. Figs. 5(18 and 50<]), with three discs ' L>. 0. (I 



(1) Stationary longitudinal wave. r.J) Progressive longitudinal wave. (.'!) Two longitudinal 



waves with phase displacement. 



Can lie used with the Projection Apparatus. 



01. i "-'.>. :>:>ti. 10:; l. 



HlL'ti- 1 . 111'.'!!'-. 5041, 





