Calometric Absolute Measurements. 



41 



(2) A completely stoppled Siemens stopple-rheostat was 

 inserted in the induced circuit, and first the arc a determined 

 which was given as deflection with the total resistance iv of 

 the induced circuit ; upon this, without making any change 

 in P, R, Gr, u, &c.j 10 S. M. U. of the rheostat were inserted 



in the induced circuit in addition to w. 

 deflection was a l7 the absolute value of 



If then the arc of 



P.R.G 



10 S. M. U. 



V 4 RV 



tan u 



2T. J 



\a x aj 



According to each of these two proceedings two series of ob- 

 servations were made — the one with the employment of a very 

 great potential-value P and a moderate intensity I of the in- 

 ducing current, the other with the employment of a compara- 

 tively small potential-value P and an extremely great inten- 

 sity I of the inducing current. As absolute value of the 

 Siemens unit there was found : — 



Aug. 20, 



» 21, 



22, 

 23, 



26, 



Series I. 



P large, I moderate. 



Method 1. 



/millim.X 



1876, 0-9558 xl0 ] 



I 



0-9536 x 10 10 

 0-9559 xlO 10 

 0-9581 xlO 10 

 0-9563 x 10 10 

 0-9549 x 10 10 



sec. / 



The mean value amounts to 0*9557 x 10 ] 



'millim. \ 



sec. 



Aug. 20, 



1876 



21, 



22, 

 23, 

 24, 



26, 



The mean value is 



Series II. 

 P large, I moderate. 



Method 2. 



0-9516 xl6»(5^\ 

 \ sec. / 

 0-9545 x 10 10 

 0-9550 xlO 10 

 0-9575 x 10 10 

 0-9556 x 10 10 

 0-9552 xlO 10 



0-9549 x 10 10 



