No. 53 585. 



Vibration Microscopes. Sound Analysis and Synthesis. 



459 





53 585. 1 = 7. 



5.3,581. 2 Tuning Forks with Resonators, same pattern as No. 53,577, for tone g a = 192 com- I s. d. 

 pound vibrations (so! 2 = 384 v. s.) 25. 0.0 



53,582. Variable Tuning Fork g = 192 compound vibrations (so! 2 = 384 v. s.) alone, on stand 



and with variable resonator 



53.583. Sound Analysis Apparatus after Konig, Figure, for fundamental tone c = 128 

 compound vibrations (ut., = 256 v. s.), with 8 spherical Resonators for tones c , CD g x , c 2 , 

 e 2> 82* 7, c 3 (ut 2 , ut 3 , so! 3 , ut 4 , mi 4 , so! 4 , 7, ut 6 ), and 8 gas-flame manometers, on stand 

 with rotating mirror (M. P. I, Fig. 822 [847]) 



53,283. Reed Pipe with Sound Horn, Figure 53,282, p. 429, fitting above apparatus, for 

 tone c = 128 compound vibrations (ut,=256 v. s.), very full tone 



53.584. Sound Analysis Apparatus after Konig, larger, Figure, with arbitrary fundamental 

 tone and 14 Universal Resonators (see No. 53,518), for the 46 tones g-j = 96 to e 3 = 1280 

 compound vibrations (so^ = 192 to mi 5 = 2560 v. s.) ; lowest arbitrary fundamental tones 

 g_ 2 (sol_,) (Pogg. Ann. 146, p. 189) 



The apparatus is built into a massive frame and is provided with hand-driven rotating mirror the 

 mechanism of which is so arranged as to run absolutely silently. The 14 Universal Resonators can be 

 regulated in such manner that the highest tone of the larger always reaches the deepest tone of the smaller. 

 They can therefore be set for any fundamental tone. The deepest arbitrary fundamental tone is 

 g = 48 compound vibrations (sol! = 96 v. s.). The resonators are connected with manometric flames. 

 The latter are protected from air currents by mica strips, which entirely obviate any breaking or spurting 

 of the flame. 



For suitable Reed Pipe see No. 53,282, p. 429. 



53,339. 14 Tuning Forks on Resonance Boxes, Figure 53,339 on p. 437, giving the first 

 14 overtones of c_, = 64 compound vibrations (ut] = 128 v. s.), for comparing with 

 the resonators 



53.585. Vowel Apparatus after von Helmholtz, with 8 harmonic tones, Figure, for de- 

 monstrating sounds of different timbre, and more especially the vowels of the human 

 voice (H. Helmholtz, Die Lehre von den Tonempfindungen, 4 th Edn., Brunswick, 1877, 

 pp. 194 et seq.) 



The apparatus consists of 8 tuning forks forming the first harmonic tones of the fundamental tone 

 c (ut s ) and which are fixed between electromagnets. The electromagnets are traversed by a current rendered 

 intermittent by an interrupting tuning fork making 128 compound vibrations (256 v. s.). Each tuning 

 fork possesses a resonator which can be closed by a flap; the resonators can be opened more or less by 

 means of a keyboard. When the resonators are closed the tuning forks are scarcely audible, but they 

 sound immediately with the desired intensity when the corresponding keys on the keyboard are depressed. 

 The interrupter circuit can be regulated by a resistance appended to the apparatus. The point of inter- 

 ruption itself is provided with massive platinum contact. Each electromagnet can be cut out singly; by 

 using corresponding additional resistance it is possible to obviate any variations in the current conditions. 



Cl. 1176. 



18. 0.0 



15. 0.0 



1. 6.0 



30. 0.0 



17.10.0 



60. 0. 





