436 



Acoustics. 



No. 53329 



53333 (53334). 1 : 5. 



53329 (53330). 1 : G. 



53335. 1 : 6. 



53337. 1 : 6. 



53338. 1 : 12. 



53.329. 13 Standard Tuning Forks in International Pitch, Figure,' in box, giving the s. d. 

 chromatic scale c x to c 2 (ut 3 to ut 4 ), without resonance box, with box for containing 9. 0. 



53.330. idem, physical pitch 9. 0. 



53,331. 8 Standard Tuning Forks in international Pitch, same construction as above, giving 

 the diatonic scale Cj to c., (ut 3 to ut 4 ), without resonance box, with box for containing 



6.0. 

 6.0. 



53.332. - - i d e m, physical pitch 



Resonance Boxes increase the price of the preceding Forks Nos. 53,329 53,332 by 0. 6. each. 



53.333. Tuning Fork with electromagnetic drive, c-! = 64 compound vibrations (utj = 128 v. s.), 

 Figure, large massive pattern, with/ steel mirrors and counterpoise, on wood base 6. 0.0 



53.334. -- idem, c =128 compound vibrations (ut 2 = 256 v. s.) ">. o. o 



53.335. 2 Small Tuning Forks, Figure, a x = 435 compound vibrations (Ia 3 = 870 v. s.), 



singly on resonance boxes, one with two sliding weights 0. is. o 



53.336. 2 Small Tuning Forks C 2 = .512 compound vibrations (ut 4 = 1024 v. s.). on resonance 



box, one with two sliding weights 0. IS. o 



53.337. 4 Small Tuning Forks on one Resonance Box, F i g u r e, for the tones c,. e,. g 2 and 



c 3 (ut 4 , mi 4 , so! 4 , ut 5 ) 0. 16.o 



53.338. 8 Small Tuning Forks, F i g u r e, each on a resonance box. giving the diatonic scale 



from {., to c., (nt, to nt s ) 3. 12.0 



53.339. 14 Tuning Forks on Resonance Boxes, Figure, giving the first 14 overtones to 



C-j^ 64 compound vibrations (ut, = 128 v. s.) 17.10.0 



These tuning forks, like the overtone apparatus, serve for selecting easily the overtones when in- 

 vest igat ing sounds with resonators or with the Koenig Apparatus for splitting up sounds. 

 The individual forks are: 



c go c i e i gi c z d e * gz b z 



128 192 256 320 384 448 512 576 640 704 768 832 896 960 Compound vilnations 

 256 384 512 640 768 896 1024 1152 1280 1408 1536 1664 1792 1920 v. 8. 





ut, so! 2 ut 3 

 2nd 3rd 4th 



mi 3 sol, 



5th 6'h' 7> 



ut 4 



8'h 



gth IQth llih I2ili 13'1> 14tl> lf>'i> Partial Tone. 



CI. 3954, 11X1, 



1126, 53S9, 3862. 



