No. .'.3480. 



Models of Larynx and Ear. Limit of Audibility. 



445 



53473. 1 : 8. 



53480. 1 : C. 



53478. 1 : 2. 



53.473. Bezold's Continuous Progression of Sounds Apparatus, Figure, for investigating 

 the tone-sensitivity of the ear, consisting of 10 tuning forks with sliding weights 

 Nos. 53,401 to 53,410, for the compass c- 3 a 2 (nt- 2 Ia 4 ), 1 drum stick No. 53 411 for 

 the forks, each one pipe Nos. 53,476 and 53,477 for compass e> a 4 (mi 4 Ia 6 ) and a 

 Galton's Whistle No. 53,479 of compass a 4 (Ia 6 ) onwards to beyond the limit of audibility; 

 I lie whole in box, the Galton Whistle being contained in a separate case 



Further particulars as to the individual tuning forks are given on p. 439 and for the pipes, below. 



53.474. Additional Series of unloaded Tuning Forks for the tones g 3 , c 4 , g 4 , c 5 (so! 5 , ut 6 , sol e , 

 ut 7 ), with drum stick and case 



r)3,475. Further complementary series, comprising a loaded tuning fork No. 53,400 for 12 18 

 compound vibrations, and unloaded forks a , a 1? and n., (Ia 2 , Ia 3 , Ia 4 ) ....... 



53,476. Pipe for the Higher Tones of Bezold's Continuous Tone Progression, large, for the 

 tones between e 2 and a 3 (mi 4 and Ia 5 ) . . 



").">. 177. -- idem, small, for the tones between a 3 and a 4 (Ia 5 and Ia 6 ) 



V>. 178. Galton's Whistle, F i g u r e, for producing the highest tones and 'for demonstrating 

 the higher limit of audibility, simple pattern 



."3. 179. - - i d e in, new improved pattern, Figure, for the tones from ;ij (Ia 6 ) to beyond 

 tlie limit of audibility (3480 30,000 compound vibrations), in case 



53,480. Dust Figure Apparatus for Galton's Whistle, F i g u r e, consisting of screw clamp 

 and 6 different glass tubes 



C1.4702, 3372, 

 11-21. 



s. d. 



22. 10. 



4. 15.0 

 4. 0.0 



2. 5.0 

 1.15.0 



0. 16. 

 2. 15. 

 0. 10. 



4698, 



