Phil. Mag. Ser. 6, Vol. 17, PL I. 



Fig. 9. 



ZlJ ■tafabt 



AJMUfUVUVUVU 



t f{f 9 fffff t f f fffffffffffffff|f|f f f|f|fcffftf|t|f 9 f 9 fffff 9 tff 



Musical arc oscillations in secondary circuit. 



Fig. 10. 



Lower note of musical arc. 

 C 1 = 1187, C 2 =/0Q0875 microfarad. 



Fig. 11. 



1 t 1 -1 1 1 .1 



f ♦ ' ' ' " 



, t t f « « • 



1 



. VarV f j ....... 



'■■a .. ,» ... .- .. •* 



Musical arc oscillations. 

 C 1 =9*55, C 2 = '000275 microfarad. 



