as Conductors of Electricity. 



(d) 



+ quadrant insulated. 6 Leclanches = 540 divisions, 



301 





Deflection. 





Deflection. 



Time. 





Time. 













Observed, j Calculated. 





Observed. 



Calculated. 



m s 







m s 











525 



525 



6 



303 



303 



20 



509 





20 



293-5 





40 



494-5 





40 



285 





1 



480 





7 



277 





20 



466 





20 



268-5 





40 



452 





40 



260-5 





2 



438-5 



435 



8 



253 



254 



20 



426 





20 



246 





40 



413 





40 



239 





3 



400-5 



397 



9 



232-5 



233 



20 



388 





20 



226 





40 



377 





40 



219-5 





4 



365 



362 



10 



214 



215 



20 



354 





20 



208-5 





40 



343-5 





40 



202-5 





5 



332-5 



331 



11 



197 





20 



322 





20 



192 





40 



312 





40 



187 











12 



182-5 



182-5 



Equation to curve 8 is 



y = 525xl0- 0413< " + -° 0025 ' 2 , 

 t being in minutes. 



It will be observed, both from the tables and from the 

 curves, that the rate of leakage is more rapid when the 

 insulated quadrant is charged negatively than when charged 

 positively. 



Taking the approximate rate of leakage from the results in 

 tables (a) and (d), and subtracting the rate without the 

 flame, we have : — 



Mean logarithmic rate per minute = ^(-037 + -0414) — •0014, 

 Mean logarithmic rate per second = '00063, 



and 



1 microfarad = 10~ 15 (C.G.S.) units ; 

 log e 10 = 2-303 ; 



10 15 

 = -00063x2-303 {C ' G '^ units ' 

 = 689xl0 15 (C.G.S.) units. 

 = 689 x 10 6 ohms. - 



" Resistance 



In the same way, using the results from tables (h) and (c), 

 we get 



