3g Art. 3. — K. Hirayama : 



Again 



J'e(e'-ejdt= f f(''-^')^ = g; ßd« 

 J ^ ^ J sex— Pi COS a s{os'e^ + x}J ' 



neglecting r/. Hence 



n,Je{e'-eJdt^±QJ'^'W^W 



< in which Q' is a quantity finite and positive, and the double sign 

 will be taken the same as that of ;y. Consequently 



fT ..ë 



noj e{e''-èJdt=2Qj _Vd'-d'dd=zQ'7:d' 



and • 



where S is a finite quantity, positive Avhen 31 is positive. Also 

 A,_ /' edd _ ê I'dd p// " dd 



where P' is a quantity finite and positive, and 

 n^T^yJ' dt^'AP'f /}^ =27tP' 



Hence 



'■'''^M=-^,ff'^~S'g' 



and 1 /. '1 



1 /"dd 



y w'^^''" 



