A DYNAMICAL THEORY OF THE ELECTROMAGNETIC FIELD. 597 



were compared by the method of least squares to determine what further cor- 

 rection depending on the square of the velocity should be applied to make the 

 outstanding errors a minimum. 



The result of this examination shewed that the calculated value of L should 

 be multiplied by 1'0618 to obtain the value of L, which would give the most 

 consistent results. 



We have therefore L by calculation 430165 metres. 



Probable value of L by method of least squares 456748 ,, 



Result of rough experiment with the Electric Balance (see 46) 410000 ,, 



The value of L calculated from the dimensions of the 'coil is probably much 

 more accurate than either of the other determinations. 



