No. 53 560. 



Tuning Fork Apparatus. Recording Tuning Forks. 



455 



53 553/58. 1 : 0. 



53559. 1:10. 



Tuning Forks, Fi g u r e, for the preceding apparatuses for demonstrating the Lissajous Curves with various phase dif- 

 ferences (M. P. I, Fig. 695 [719]), very large and massive pattern. 



(a) With Steel Mirror (b) With Glass Mirror 

 Compd. Vib., ut 3 =512v. s. 



so! 3 = 768 v. s. 

 sol, = 384 v. s. 



2. 8. 

 2. 6. 

 2. 12. 

 2. 14. 

 2. 10. 

 2. 14. 

 3. 0. 



2. 

 2. 

 2. 

 2. 

 2. 

 2. 



2. 

 0.0 

 6. 

 8.0 

 4. 

 8.0 



fa 2 = 341V 3 v. s. 

 Ia 2 = 426 2 / 3 v. s. 

 mi 2 = 320 v. s. 



la t = 213V 3 v. s. 3. 0. 2. 14. 



The Tuning Forks together, listed above, give, with fork c = 128 compound vibrations (ut 2 = 256 v. s.) of 

 Apparatuses Nos. 53,541 53,544, the phase differences indicated. 



If desired we supply suitable boxes for 2, 3, 4, 5, 6 and 7 forks at prices of 0. 14. 0, 0. 16. 0, 0. 18. 0, 

 1. 0. 0, 1. 2. and 1. 4. 0. s d 



* 53,552. 7 Tuning Fork Curves on Stand, Figure, for the Projection Lantern 1. 0. 



The curves are taken with Tuning Fork Apparatus No. 53,544 and show the phase differences 

 1 : 2, 2 : 3, 3:4, 3:5, 4:5, 5:6, and 35 : 36. 



Recording Tuning Forks, Drums and Vibrographs. 



Chronographic Tuning Forks for phonautographic purposes, Figure, with style and elec- 



troinagnetic drive, accurately adjusted at 20 C. 



List No. 53,553 53,554 53,555 53,556 53,557 53,558 



Compd. Vib. per second 50 100 200 250 500 1000 



V. s. 100 200 400 500 1000 2000 



5.0.0 4.0.0 4.0.0 4.0.0 4.0.0 4.10.0 



53.559. Recording Device for Determining the Frequency of a Tuning Fork, for Students' Use, 

 after Hahn, Figure, with pendulum, 1 tuning fork c 1? 1 tuning fork d t , 3 glass plates, 

 1 blackening lump, 1 striking hammer (Hahn, Schiileriibungen, Fig. 152) 



53.560. Stand for fixing Vibrating Bodies, Figure on p. 454, with tuning fork of 50 vi- 

 brations and electric signal, to be used in conjunction with the cylinder of the Phonau- 

 tograph (No. 53,571) 



1. 10. 



9. 0. 



* Can be used with the Projection Apparatus. 



Cl. 1143, 339, 

 1167, 5967. 



