5« 



<y. 



n/iJi/ii- 



10. 



tl 



J 



fZ 



aa/m 



f^ 



A 



15 



f6 



o/win/v 



m- \ 



18 



Fig. a. 



No. 13, 



14, 



» IS 

 16. 



•7 

 .. 18 

 Nos. 19 



Tone 3 advanced J vibration when starting. 



and 20 are combinations from the Diatonic Scale. 



No. 19 shows the Common Chord, Major : — 



Ratios of vibration i : f : f • 



No. 20 shows the Common Chord, Minor : — 



Ratio of vibration .. .. ■■• ^ '■ z '• i- 



In both the intensities of the component tones are equal, and 

 their phases at starting identical. 



