444 



Acoustics. 



\i. ..1461 



53462. 1 : 3. 



53464. 1 : 4. 



53469. 1 = 9. 



53463. 1 : 4. 



53471. 1 : 7. 



Membrane Pipe serving as model of the Larynx: see No. 53,281 (cf. W. D. Fig. 225 [211]) 



53.461. Model of Larynx, after Bock, simple 



53.462. - i d e m, with hyoid bone, Figure 



53.463. - idem, with view of the pharyngeal space and nasal cavity, Figure . . . 



53.464. Model of Ear, Figure, can be taken entirely apart, very carefully constructed. 

 five times actual size 



53,465. - idem, ten times actual size 



53,468. 4 Steel Bars, c,, c 6 , c e , c 7 (ut g , ut v . ut g , ut 9 ), lor testing the upper limit of audibility, 

 in case (M. P. I, Fig. 679 [705]) 



53,461). 5 Steel Bars, c 4 , c 5 , c 6 , c,, c g (ut g ,ut 7 , ut 8 , ut 9 , ut, ), F i g u r e, for the same purpose, 

 with suspension and steel hammer 



53,470. 10 Steel Cylinders, c s , e s , g s , c 6 , e ? , g 6 , c 7 . c : , g 7 . c 8 (ut 7 . mi 7 , sol T . ut H . mi s , sol,, ul,,. 

 mi 9 , sol,,, lit,,,), for testing the upper limit of audibility, with steel hammer, cf. Fig. .VS. I , 1 



53.47.1. 22 Steel Cylinders, from c- to < (lit, u1, n ), for the same purpose. Figure, with 

 steel hammer . 



4 Tuning Forks for showing the upper limit of audibility, see Fig. 53,327, p. !""> 



Large Tuning Forks lor shouini: the lower limit of audibility: 

 sec \os. .vs. :i!is .- ;,:!. mo, |>. 439. 



Cl. 1192, 1194. 

 II 113. 6001. 



8. d. 



0. 5.11 

 0. (i. d 

 (I. IS. 

 0.15. 



0.12. O 



0. 15. 



1. 4.0 

 I. Ul. 

 3. 10. 



7. II d 



L'. S. 

 1118. 



