Capacities of different bodies compared 231 



A tin cylinder 35-9 inches long and 2-53 in diameter, on do. 



[Art.] 

 l~,l Sg 3-83 .6-64 n 



A tin cylinder 54-2 long and -73 in diameter, on do. 

 A - igi 17-89 



B- 5 13-82 4 ' 7 I5 ' 85 @ 



Brass wire 72 inches long and -185 in diameter, on do. 



B 44 13-58 



4-08 15-62 [iol 

 A - 19 17-66 



Th. 50. S. H. i6J. C. H. -8*. 



479] According to the 5 th and 6 th articles of last .page, the quantity of 

 electricity in the square is to that in a circle of the same area as 1-08 to i, 

 and that in square to that in oblong of the same area as -991 to i. 



By comparing the 2 nd article with the 3 last, the quantity of electricity in 

 /"thick cylinder 



I thin cylinder may be to that in a globe whose diameter equals the length of 

 [wire 



cylinder length I<l8 J f 2 length 



JL- as -962 to N. log 3L_ , or X . ll6 to N . L. 3 , or as 1-271 



980 1-103 1-218 



4 times length 



to IN . L . -, . .- . 



thickness 



Therefore, if we suppose that the real quantity of electricity in any cylinder 

 is to that in the globe whose diameter equals the length of the cylinder as i 



2 ce len a th 2 ce length 



t0 N ' L ' thickness ' r aS - 4964 t0 tab ' 10g thickness ' U wil1 agree Ver y WeU 

 both with theory and experiment. 



Or by comparing this with the first article, the quantity of electricity in 

 any cylinder is to that in a circle whose diameter is equal to the length of the 



2 ce length 

 cylinder as - 7 59 to tab. log thickness - 



Comparative charges of bodies tried in the former experiment. 



By means of this experiment and that of 1771. [Arts. 455, 456.] If the 

 charge of the globe is called i, that of the circle will be -992, therefore, by 

 comparing 6 th and 7 th articles with 5 th , the charges of the square and oblong 

 will be -957 and -965. 



By comparing arts, i and 5, the charge of circle on waxed glass is greater 

 than on silk strings in ratio 1-042 to i, and therefore if charge of cylinders and 

 wire on waxed glass are supposed greater than on strings in the ratio -1-021 

 to i f , the charges of thick cylinder, thin cylinder and wire will be 



1-028 -980 and -966. 



* [Exp. vil, Art. 281.] 



f [The cylinders and wire were supported on waxed glass at one end only.] 



