. 53373. 



Standard Tuning Forks. Tuning Forks with Resonators. 



437 



53339. 1 : 10. 



53340 (53341). 1 : 7. 



53,340. 2 Tuning Forks Cj = 256 compound vibrations (ut 3 = 512 v. s.), large pattern, on 

 accurately adjusted resonance box, one with two sliding weights, for producing vibrations 



Figure Together 



These tuning' forks have exactly the same pitch and are used for the experiment on co-vibration 

 by resonance. The experiments succeed at a few metres distance if the open sides of the resonance 

 boxes are turned towards each other and one fork is smartly struck repeatedly. 



53.341. 2 Tuning Forks a! = 435 compound vibrations (Ia 3 = 870 v. s.), Figure, same 

 pattern as No. 53,340 Together 



53.342. 2 Tuning Forks c., = 512 compound vibrations (ut 4 = 1024 v. s.), same pattern as 

 No. 53,340 . . . . " 



53.343. 4 Large Tuning Forks, each on a resonance box, giving the major chord c,=256 

 .compound vibrations, e 1? g x , c 2 (ut 3 = 512 v. s., mi 3 , so! 3 , ut 4 ) 



53.344. -- idem, with the fundamental tones C = 128 compound vibrations, e , g , c t (ut 2 = 256 

 v. s., mi 2 , so! 2 , ut 3 ) 



53.345. 16 Tuning Forks on Resonance Boxes, cf. Figures 53,340 and 53,341, very massive 

 pattern, Physical Pitch 



s. d. 



.2. 8.0 



2. 4.0 



2. 2.0 



4. 16. 



6. 0.0 



21. 5.0 



List No. 53 345 a 



1. 10. 



List No. 53 353 

 d,=576 



53346 



d 1= 288 



re 3 = 576 



1. 10. 



53 354 



53 347 53 348 



mi 3 =640 



i.io.o 



53 355 



1. 10. 

 53356 



g 2 =768 



53349 



g 1 =384 



so! 3 = 768 



1. 10. 



53357 



53350 



a 1 = 426 2 / 3 



la 3 = 853V 3 



1.5.0 



53358 



b,= 960 



53 351 53 352 



b t = 480 c 2 = 512 vibrations 



si 3 = 960 ut 4 =1024 v. s. 

 1. 5. 1. 5. 



53 359 53 360 



c,= 1024 c 4 = 2048 vibrations 



re 4 =1152 mi 4 =1280 fa 4 =1365V 3 so! 4 =1536 la 4 =1706 2 / 3 si 4 =1920 ut, = 2048 ut 6 = 4096 v. s. 

 1. 5. 1. 5. 1. 5. 1. 5. 1. 5. 1. 5. L 5. 1. 5. 



Tnese forks are accurately constructed in accordance with Standard Forks and with carefully 

 tuned boxes. 



53,361. 13 Tuning Forks on resonance boxes, cf. Figures 53,340 and 53,341, very massive 

 pattern, in International Tempered Pitch 



List No. 53 361 a 53362 53363 53364 53365 53366 



^ = 258. 652 c#! = 274. 033 d t = 290. 327 d*, = 307. 592 6i = 325. 881 f 1= 345. 259 vibrations 

 ut 3 = 517.305 ut* 3 =548.066 re 3 =580.655 re# 3 =615.183 mi 3 =651. 763 fa 3 = 690. 519 v. s. 



1.10.0 1.10.0 1.10.0 i. 10.0 i.io.o 1.10.0 



List No. 53 367 53 368 53 369 53 370 53 371 53 372 53 373 



f*!=365.790 g, = 387.541 g#! = 410.585 a, = 435 ^, = 460.866 bj = 488.271 c 2 =517. 305 vibr. 



fa# 3 = 731.580 sol a = 775.082 sol* .,= 821.171 Ia 3 = 870 la# 3 = 921.733 si 3 =976.542 ut 4 = 1034. 610 v. s. 



1. 10. 1. 10. 1. 10. 1. 5. 1. 5. 1. 5. 1. 5. 



18. 10. 



Cl. 1133. 6025. 



