222 "Journal of Experiments, \ 77 1 



With large plate. 



Rosin + o sep. very little, rather uncertain. 



A + 17 sep. a little, rather uncertain. 



+ 14 sep. a little. 

 Double plate + 15 do. 



462] Hence it appears that A contains as much electricity as the two 

 double plates. The rosin plate required the wire to be drawn out 18 inches 

 less than them, therefore rosin plate contains 40-7 inches of electricity, and 

 therefore quantity of electricity therein = comp. power x *. 



A contains 36-7 inches of electricity, and therefore as A and B are of the 

 same kind of glass, the quantity of electricity in them = computed power x 

 1-62 = -21056, and B contains 64-96 inches of electricity. 



The whitish glass plate required the wire to be drawn out 27 inches less 

 than B, D requires 33 less and N requires 14 less, P requires 3 more than N, 

 21 less, and Q 37 less than N, therefore W contains 71-2 of electricity, D 72-5, 

 N 68-2, P 67-5, O 73 and Q 76-7. 



Therefore f D 1-58 



W = 1-60 

 B = 1-62 



P = 1-69 spe. gra. 

 N = 1-71 

 O = 1-83 



Q = 1-92 



Quant, el. in.f 

 comp. power 



2-973 

 2-787 

 2-674 

 2-752 

 2-682 



2-514 

 2-504 



463] Experiments to determine whether the quantity of electricity in coated 

 plates bore the same proportion to that in other bodies whether el. was weak 

 or strong, or whether it was positive or negative J. 



On the side of corks was placed plate A with circle 2 inches in diameter, 

 containing 31 inches of electricity. On the other side there was no coated plate, 

 but the wire was drawn out 23 inches and made to rest at further end on the 

 sliding wooden plates. The heavy corks required more than 2 ce the force to 

 make them separate than the light ones. 



With light corks S o sep. a very little neg. 

 heavy S 5 sep. a little. 



L 5^ sep. a little pos. 

 light L - 7 do. 



* [So in MS. See note to Art. 464.] 



f [The "real charges" here given are in "circular inches," and the computed 

 power is 8 times the true value, so that the numbers here given must be multiplied 

 by 8/1-57 = 5 -I to compare them with those given in Art. 370. The diameters of 

 the coatings in these experiments are not the same as those in Art. 370 which are 

 taken from Arts. 508-515 and 672.] 



t [Art. 355.] 



