COFFIN. 



THE SELF-INDUCTANCE OF COILS. 



801 



PLOT II. 



; ' ; i- , ; I __ : : J 



c, o 



Curve showing the fractional part of the maximum decrease for different fre- 

 quencies in a coil, the wire of which has a diameter of .063 cm. 

 Ordinates ~ fraction of total change left unchanged. 



.. . frequencies 

 Abscissae = — y^ 



For example, at 30,000 ^ per second the correction is 0.157 X 0.0000618 Henrys 

 in 0.03G2 Henrys, or about 1 part in 3600. 

 vol. xli. — 51 



