the Capacity of Gold- Leaf Electroscopes, 251 



These give the equation 



.n-o+^ = 0>864 , 0>867 ^ 0#865 ^ 0866 ^ 0#g6 ^ 0>867 



= 0*866 (mean), . . . . (2) 

 •solving the equations (1) and (2) we get 



K = 39;2 E.S.U. and ^=3'0 E.S.U. 



Probable error of ;i single observation = ±0*6 E.S.U. 

 Determination of the capacity of the charger alone : — 

 The charger was charged from a battery of 56 large storage- 

 cells, the potential bsing measured by a standardised Paul 

 mi Hi voltmeter and 150-volt shunt. The capacity of the 

 quadrant system was adjusted by the sliding condenser to 

 162*2 E.S.U. The results obtained are tabulated below : — 

 V= Potential to which the charger was raised, 

 d i= deflexion by one cadmium cell, 

 d 2 = deflexion after sharing the charge on the charger 



with the quadrant system, 

 <7 3 = deflexion by one cadmium cell again, 

 c ■=. capacity of the charger calculated from the equation 



2d, 



t\T 



(K+Orrrx 1-02 



Table I. 



No. 1 2 3 4 5 6 7 8 9 10 11 12 



V 109 109 109 109 109 110 110 110 110 110 110 110 



, ( / : 3166 3158 315-2 31.4-8 314-0 313-0 312-2 311-0 310-0 309*2 308-4 306-4 



d y 305-2 306-0 305-7 301-2 305-5 306-4 303-8 302-3 302-0 301-3 301-0 298-8 



d 3 3158 315-2 314-8 314-0 313-0 312-2 311-0 310-0 309-2 3084 307 4 305-4 



W 1-48 1-49 1-49 1-48 1*49 1'49 1;48 1-48 1-48 1-48 1-48 1-48 



Mean value of a' = 1*483. Probable error of a single obser- 

 vation = ±(>004 E.S.U. 



In the same way the capacity of a gold-leaf system plus 

 charger, c + c', was determined. The capacity K being this 

 time adjusted to 242*2 E.S.U. to bring down the potential 

 after sharing to near one volt. 



Table II. 



No. 1 2 3 4 5 6 7 8 9 10 11 12 



T 110 110 110 110 110 110 110 110 110 110 110 110 



■d x 321-6 320-2 318-8 318-2 3170 3162 315-4 314"S 314-0 3130 3120 3110 



t 3205 3190 3180 318*1 316-2 316-0 315-0 3126 3137 3U-9 3110 3105 



1 320-2 318-8 318-2 317*0 316-2 315-4 314-8 314-0 3130 312-0 311-0 3100 



-c+c . 2-26 2-26 226 2*27 226 2-27 2-27 2-25 227 2-26 2 27 227 



S 2 



