Jones & Roberts. Phil. Ma*. Ser. 6, Vol. 22, PL XII. 



Fig. 



Case I. i =5*05 amperes. 



Fig. 9. 



Case II. ? o =4'02 amperes. 



Fig. 10. 



Case III. >o=9-l amperes. 



Fig. 11. 



mammam 



Case IV. 



?' =5'8 amperes. 



