398 



Dr. W. L. Kobb on Oscillations 



2. Effect of varying the Resistance. 



A series of determinations was made to find the effect of 

 varying the resistance of the charging circuit upon the varia- 

 tions observed in the charge of the condenser. The resistance 

 was varied by changing the suspension of the sphere S 2 (see 

 fig. 1). In one set the suspension was a single silver wire, 

 0*05 millim. in diameter and 6 centim. long. In a second 

 set a band made up of ten such silver wires, and consequently 

 having only one tenth the resistance, was used. In the third 

 set a single platinum wire 0*05 millim. in diameter and 6 

 centim. long was substituted for the usual suspension of silver 

 wire. The results obtained with these various resistances are 

 given in Tables IV. and V. 



Table IV. (See also diagram 3.) 

 Mica Condenser (normal charge = 1'978 microcoulombs). 



Observation 



R = 0-04 ohm. 



E=041 ohm. 



R = 3 72 ohms. 















number. 



Charge of 



Deviation 



Charge of 



Deviation 



Charge of 



Deviation 





Condenser. 



from the 



Condenser. 



from the 



Condenser. 



from the 





Micro- 



normal 



Micro- 



normal 



Micro - 



normal 





coulombs. 



charge. 



coulombs. 



charge. 



coulombs. 



charge. 



1 



2092 



+0-114 



1-969 



-0-009 



1-916 



-0062 



2 



1-985 



+ 007 



1-949 



-0029 



1-908 



-0070 



3 



1-863 



-0-115 



2015 



+0037 



1-910 



-0-068 



4 



1-932 



-0046 



1-928 



-0-050 



1-931 



-0047 



5 



2091 



+0113 



1-964 



-0014 



1-908 



-0-070 



6 



1-813 



-0-165 



1-987 



+0009 



1-908 



-0070 



7 



2-015 



+0-037 



1-961 



-0017 



1-910 



-0-068 



8 



2180 



+0-202 



1-978 



+0-000 



1-919 



-0059 



9 



1-936 



-0042 



1-934 



-0044 



1-908 



-0070 



10 



2116 



+0-138 



2021 



+0043 



1-926 



-0052 



11 



2004 



+0-026 



1-902 



-0-076 



1-939 



-0039 



12 



2031 



+0-053 



1-963 



-0015 



1-916 



-0-062 



13 



2045 



+0-067 



1-984 



+0-006 



1-909 



-0-069 



14 



2136 



+0-158 



1-961 



-0017 



1-916 



-0062 



15 



2054 



+0-076 



1-979 



+0-001 



1-917 



-0-061 



16 



2-133 



+0-155 



1-924 



-0054 



1-924 



-0054 



17 



2184 



+0-206 



1-957 



-0021 



1-918 



-0060 



18 



1-922 



-0056 



1-885 



-0093 



1-926 



-0052 



19 



2-080 



+0-102 



1922 



-0-056 



1-908 



-0 070 



20 



2-084 



+0106 



1-976 



-0002 



1-926 



- 052 



