Electromagnetic to the Electrostatic Unit. 309 



they otherwise would. Following is the last observation made, 

 given as a specimen : 



Resistances a : 1930-0 — 194*9 = 1736*0 Temperature: 



1932-0 — 195-5 1736-5 A = 22°-3 



1932-0 — 197-0 1735-0 B 23°*0 



1932-5 — 196*5 1736*0 Graphite 23°'0 



The wire was first in contact at m (fig. 3), and the resistance 

 a corresponding to joint capacity of condenser and charging 

 system was 1930*0 ohms. The wire e (which slides with some 

 friction in the small glass tube G, the latter being fastened at S 

 to the ebonite R) was now lifted very slightly, and 194 - ohms 

 found to give no deflection on closing the key in the galvanom- 

 eter circuit. The wire was then again lowered to contact and 

 the subsequent observations made in a similar manner. Any 

 leakage increases the numbers alike in the first two columns, 

 and if constant does not affect the differences, which give the 

 capacity of the condenser. But the leakages are not constant, 

 so that small differences are thereby introduced ; this accounts 

 in part for the differences above, though of course small differ- 

 ences are inevitable if there be no leakage. As illustrating 

 how a large leak if constant eliminates itself the following item 

 from my notes of June 6 is of interest. The wooden base of 

 the condenser was thoroughly wet with a cloth, and the leakage 

 thereby introduced changed the readings from 1924-186 to 

 1933-195, the difference, 1738, remaining unaltered. 



The mean of the above differences is 1735-9 

 Correction: excess at 20° C. = 5 *4; temp. corr. 1*3 ;= 6 - 7 



.-. a= 1742-6 

 Box B = 100, 120 at 23°*0 = d 

 R. (calculated as already explained) 2,435,800 = c 

 Frequency of the fork 130*075 = n 

 1 B. A. unit = -98664 ohm. 



C = =- X „ C being the capacity of the condenser 



ncd -98664 X10 9 , 5 L J 



in absolute electromagnetic units. 



og c 



= 2,435,800 



= 6*386642 



" d 



100,120 



5*000521 



" n 



130*075 



2-114194 



u 



•98664 X10 9 



8-994159 

 22^495516 



" a 



= 1742*6 



3*241198 



" C 





2b T 745682 n. 



« c\ 



,= 50*069 



1*699568 



" u 2 



20*953886 



" V 





10*476943 



'. V 



2*9988 X10 10 cm. per sec 



