ON STANDARDS OF ELECTRICAL RESISTANCE. 487 



Times. — First four oscillations ; the spot crossed tlie central point iu the 

 same direction at 



0' 35", 0' 55", 1' 14|", 1' 33" ; 

 last four oscillations, 



9' 13", 9' 32", 10' 10", 10' 29". 

 Total number of oscillations 31. Mean value of 2if=19' 15". 

 Value of R^. Indirect method : — 



a. Oj. b. Aj. c. d. E[ Ohm's. 



r. . . .8000 10000 1000 649 1000 275i 5-17 X 10^ 

 2°,... 6000 8000 1000 575 1000 .3541 5-17 ,, 

 3°.... 8000 10000 lOUO 647 1000 274A 5-12 ,, 

 4°.... 6000 8000 1000 574 1000 355| 5-18 „ 

 Mean value of Ej in absolute measure 5-16 x 10'". Value of S, 99-53 x 10 -'% 

 Value of i?j. Direct method. Eattery resistance : — 

 /. h. \. g. B. 



r.... 2 18700 30 47 484),. , .t, .cq 



2^ ... 10 18000 300 47 492 \ ^^'^'^'^ ^'''1"*' °^ ^ ^^^• 

 Deflection with variable resistance in circuit : — 



d. k. B. g. n. E. Olim's. 



l°....226i 22000 488 47 1000 5-10x10' 

 2°....310i- 16000 488 47 1000 5-13x10^ 

 Mean value of Rj=5-125x 10'" absolute units. Value of S from values 

 of t and I as above, 100-21 x lO-i^. 



September 24. — Blsclianje. — sin | ? = 84-75. E^ from indirect method : — 

 a. «!. h. *j. c. d. E, Olim's. 



P.... 6000 8000 1000 575 1000 354 5-18x10^ 

 2°.... 8000 10000 1000 648 1000 275 5-16x10^ 

 Mean value of E^ in absolute measure 5-17 X 10". Assuming t as on 

 September 23, 8=99-92x10-''. 



The box holding the condenser was now filled iip with an insulating com- 

 position, 



October 13. — Discharge. — 184 divisions, 12 divisions lost on return, 

 sin I i=93-5. Discharge after one minute's insulation 181 divisions. 

 Time. — First four oscillations, 



0'30", 0'51", I'll", r31"; 

 last four oscillations, 



10' 4", 10' 23", 10'43|", 11' 5". 

 Total number of oscillations 31. Mean value of 2^=20-47. 

 li^ hi] indirect method : — 



a. «,. b. b^. c. d. E,. 



8000 10000 1000 646 1000 333 6-19 x lO''. 



ValueofS= 98 -42x10-'-. 



B.^ hj direct method. Battery resistance : — 



/• h. /«,. ff. B. 



10 17400 700 47 223i 



Direct deflection : — 



d. Jc. B. g. n. E,. 



l°....270i 22000 223i 47 1000 001x10'' 

 2^...331 18000 223l 47 1000 6-05x10' 



Mean value of Ej=6-03 x 10'" absolute units. Value of S=101-03 X lO-'^. 

 October 15. — Discharge : — 



1°. 2°. 3° 4° 5° (y' 



185 185 I84i 184 184| 184f 



Mean 184-6, adding 3 for air, sin 1 1 = 93-8. 



Times.— First four, 0' 23", 0' 42|", missed, 1' 24" ; last four, 7' 55", 8' 16", 

 8' 35", 24 oscillations in all. Mean value of 2^=20-56. 



