Nn. 53173. 



Wave Machines. 



415 



53 169. 1 



53 172. 1 : 6. 



53 173. 1 : 6. 



s. d. 



53.163. 2 Spiral Spring Models for imitating sound vibrations (M. T. Fig. 96) 0. 6. 



53.164. Wave Apparatus after Melde; a gut string of 90 cm length which is set in synchronous 

 vibrations by a tuning fork, Figure (M. P. I, Fig. 632 [659]) 2.10.0 



53, 165. - - i d e in, with platinum wire string 0.35 mm thick, which is rendered incandescent 



by an electric current for making the experiment more apparent 4. 0. 



53.166. - - i d e in, larger, with very massive fork and electromagnetic drive for permanently 

 maintaining the vibrations, Figure, with gut string 5. 0. 



53.167. -- idem, w-th platinum wire string 0.5 mm thick 7. 10. 



53.168. Rotary Screw Spiral after Friedr. C. G. Miiller, for demonstrating progressive sine 



waves (M. T. p. 87) 0. 12. <J 



* 5:>,l 60. Transverse Wave Machine for the Projection Lantern, Figure (Fr. phys. Teclm. 



1. L>, Fig. 3405) ' 2. 8. 



53.170. - - i d c m, with 10 angle-shaped rods for demonstrating a longitudinal wave. . . 2. 1.2. o 



53.171. NEW. Wave Machine after Steiudel, for transverse and longitudinal waves and for 

 demonstrating the interference of two waves ! 6. 0. 



Tin- Wave Machine comprises two machines of pattern No. 53,169, the excentrics of which -can 

 be reciprocally adjusted so as to vary the phases of the two waves relatively to each other. The rods 

 of the 1\vo machines are connected with each other by levers and set a third row of rods into motion, 

 thus showing the interference of the two waves. 



53.172. Transverse Wave Machine, Figure 



53,1 73. Wave Machine after Fessel and Pliicker, Figure (M. P., 9 th Edn., II, 1, Figs. 817 

 to 821), with two adjustable wave troughs and two sets of pins with balls on the ends 

 for demonstrating transverse, circular and elliptic wave motion, of polished mahogany 

 with iron legs 6. 0. 



Cl. 5761,336-.', 

 # Can be used with the Projection Apparatus. m-.':<. 



