[ROBERTSON] INSULATED METALLIC CONDUCTORS 



TABLE I. Contd. 



113 



No. 



13 



14 



15 



16 



17 

 18 

 19 

 20 

 21 

 22 



23 



24 



25 

 26 



27 



28 

 29 



Combination. 



Lead No. 1 in No. 3 



Lead No. 2 in No. 3 



Double combination. 

 Lead No. 1 in Lead No. 

 2. Lead No. 2 in Lead 

 No. 3.... 



Double combination. 

 Lead No. 1 in Lead No. 

 2. Lead No. 2 in Lead 

 No. 3.... 



Lead No. 2 in No. 4 



Lead No. 2 in No. 4... . . 



Lead No. 2 in No. 4. . . . . 



Lead No. 2 in No. 4 



Lead No. 2 in No. 4. ... . 



Lead coated with alum- 

 inium paint. No. 2 in 

 No. 4 



Same combination, two 

 coats of bronze paint. 



Same combination, two 

 coats of bronze paint. . 



Tin No. 1 in Tin No. 1 . . 



Tin No. 2 in Tin No. 2... 



Double combination. Tin 

 No. 1, No. 2 in Tin No. 



2 



j Maximum and 

 Sign of ' minimum val- 

 charge of lues of potential 

 insulated j of insulated 

 cylinder. cylinder in 

 millivolts. 



Tin No. 2 in Tin No. 2.. . . 

 Tin No. 2 in Tin No. 2... 



Remarks. 



+ 42.5,41 



50 



27.2, 21 



13, 5 

 174, 160 

 268.7 

 105, 70 

 105, 70 

 105, 70 



22.6 

 75 



125 



83, 66, 85 

 91, 48, 89 



94 

 171, 38 



82 



Fourteen days after No. 



Radium used, inner cylin- 

 der had been abraded 

 with emery paper. 



Radium used. Eleven 

 days after No. 4, and 

 four days after No. 14. 



Two days after No. 15. 

 Cleaned one day before. 

 One day after No. 17. 

 Three days after No. 17. 

 Five days after No. 17. 

 Six days after No. 17. 



One day after No. 23. 



Nos. 1 and 2 were 

 made out of the same 

 sheet of tin. 



Two days after No. 26, 



After cleaning. 



One day after No. 28. 



Sec. IIL, 1908. 8. 



