No. 53502. 



Tonometric Apparatus. 



447 



53 497. 1 : 10. 



53 501. 1 : 6. 



53.496. Tonometer No. 2 of 65 tones: Fundamental tone c = 128 to c, =256 compound vi- 

 brations (ut, = 256 v. s. to ut 3 = 512 v. s.) each succeeding tone about two compound 

 vibrations higher than the preceding 



53.497. Tonometer No. 3 of 65 tones, Figure: Fundamental Tone c l = 256 to c 2 = 512 com- 

 pound vibrations (ut 3 = 512 v. s. to ut 4 = 1024 v. s.), each succeeding tone about four 

 compound vibrations higher than the preceding 



53.498. Tonometer No. 4 of 129 tones: Fundamental Tone c t = 256 to c 2 = 512 compound vi- 

 brations (ut 3 = 512 v. s. to ut 4 = 1024 v. s.), each succeeding tone about two compound 

 vibrations higher . . 



53.499. Tonometer of 129 tones: Fundamental Tone c 3 = 512 to c 3 = 1024 compound vibrations 

 (ut 4 = 1024 v. s. to ut s = 2048 v. s.), each succeeding tone about four vibrations higher 



53.500. Overtone Apparatus, Figure (W. D. Fig. 224 [210]), consisting of 9 reed pipes 

 with wind chest and wind regulator, for the 1 st to 9 th overtone of c-, = 64 compound vi- 

 brations (ut! = 128 v. s.) 



Resonators for above: see pp. 450 and 451. 



53.501. - - i d e rn, Figure, the first 32 overtones of c-! = 64 compound vibrations (utj = 128 

 v. s.) to c 4 = 2048 (ut 6 = 4096 v. s.) with wind chest and air regulation. 



If desired we also supply overtone apparatus for other fundamental tones. 



53.502. Interval Apparatus after Htumpf, with 20 tones in the compass of an octave and funda- 

 mental tone of 400 compound vibrations (800 v. s.) 



In addition to the fundamental tone (1:1; 400 compound vibrations) the apparatus has: chro- 

 matic second (25 : -24; 410.66), minor second (16 : 15; 426.66), major second (9 : 8; 450), Pythagorean 

 minor third (32 : 27; 474.1), tempered minor third (363 : 305; 476), pure minor third (6 : 5; 480), pure 

 major third (5 : 4; 500), tempered major third (635 : 504; 504), Pythagorean major third (81 : 64; 506.25) 

 pure fourth (3 : 4; 533.33) augmented fourth (45 : 32; 562.5), tempered fifth (2655 : 1772; 599.3), perfect 

 fifth (3 : 2; 600), perfect minor sixth (8 : 5; 640), perfect major sixth (5 : 3; 666.66), natural seventh 

 tone ,,i" (7 : 4; 700), minor seventh (9 : 5; 720), major seventh (15 : 8; 750), and octave (2:1; 800). 



s. d. 



15. 0.0 



15. 0. 



22. 10. 



22. 10. 



4. 4. 



9. 0.0 



7. 10. 



Cl. llll, 1110. 



