RATIO OF UNITS. 



According to these data, the distance h from the axis to the line 

 of the centres is equal to 5 -1502 cm., and the expression for the 

 couple of the electric action is 



fh 5*1502 



ly.> 



2I74/ 24-43 



The torsion of the wire determined by the method of oscillations 

 gave a couple of 0-0050615 for an angle of i'. T being the number 

 of minutes observed, the correction made for leakage, we have 



- = 0*00506 1 5T, 

 24*43 

 or 



= 0*35164^, 



7752 



rf - 



The same charge, represented by Q in electromagnetic units, 

 was given by the swing a of the galvanometer, all corrections 

 being made. 



The dimensions of the frame were 



<z= 13*324 cm., 

 2C= 4'o8ocm. , 

 2^= 7 -204 cm., 



n= 5 -635 cm., 



and the needle was 2 cm. in length; from it was deduced 0=2*621. 

 Investigation of the oscillations of the needle had given 



T = 9*244", 

 A = 0*070". 



Taking for the terrestrial component H = 0-17983, and allowing for a 

 correction of 0*0014 for the torsion of the wire, we have finally 



H x 1-0014 x T a 



GTT x 1*0024 4937 ' 



and consequently 



q 



Q 



