448 



Acoustics. 



NIL 



53506 (53230, 53231, 53503, 53482, Tone Variator 275 550, 53485, 53487, 53282). 1 : 12. 



r>.'5,r>o:5. Interval Apparatus and Tonometer after Prof. Ebbin;haiis. cf. Figure r>:5,ro< 

 (the box-shaped apparatus in the forejjround of the table), with 22 interval tones within 

 an octave, having the fundamental tone of 400 compound vibrations (800 v. s.) with 

 28 tones for tone-measuring at corresponding intervals between .'50 and 1600 compound 

 vibrations (60 and 3200 v. s.) and with 16 tones for tone-measuring between the 

 fundamental tone of 400 compound vibrations (800 v. s.) and its major second . . 



The following reed pipes are fitted for demonstrating the intervals: fundamental tone (1:1: 4(M 



augmented fourth (%' , : 1: 502.5), tempered fifth cjli.Vi : 177-2: r,!t!l.:!). perfect fifth (3 : '2: (ioo). perfect 

 iiiinor sixth (8 : 5: (i4n). perfect ui:ijor sixth (5 : 3:666.66), natural seventh (7 : 4:700). seventh i 1 .. ' : , : 1 : 

 711.1), minor seventh (!( : 5: 72u). major seventh (15 : 8; 750) and the octave i _' : I: son). 



s. d. 



IS. 0.0 



pipes mentioned above can lie used in part for tonometric purposes: for this special purpose 

 has reeds with :i(i. 4o. .VI. (in. To. so. !tn. Inn. |-2(i. I L>r>. l.Vi. 1 no. -2011. -2 in. I'.Vi. :inu. :\2(>. 



The reed 



the ii]iparatns has 



3liO. 4(1(1. 48(1, 50(1, (>(Kl. sun. linn. '.Kill, lllllll. 1-20(1. Kidll compound vibrations. 



Cl. 4139. 



