on dielectric plates of air 343 



P. 66 [Art. 538], a ball blown at end of therm, tube tried in same manner. 

 Charge just the same whether electron! . at i + 3 or 3 + i. 



P. 68 [Art. 538], charge D ^ less with el. at 3 + i than at i + 3. 



P. 82 & 84 [Arts. 551 & 555], tried with machine for finding quant, el. in 

 common plates. No perceptible diff. between charge of E whether tried with 

 el. at i + 3 or 3 + i. 



665] By P. 9 [Art. 661], it should seem that el. spread. -034 inc. more on 

 surface with greater degree of el. than with smaller, and therefore, as the diam. 

 coating of E or D is 2-16. 



So that it should seem as if the charge of a coated plate in which the 

 spreading of the el. was prevented would be at least ^ less with the stronger 

 degree el. than with the weaker. 



666J By exper. of P. 69 [Art. 539], it appeared that the charge of tin cyl. 

 was to that of D + E when electrified very weakly as 1-28 to i, and by P. 70 

 [Art. 539] as 1-24 to i. By mean as 1-26 to i*. 



By mean of P. 76 [Art. 545], the charge of the same cyl. was to that of 

 D + E when electrified in the usual degree as 1-33 to I. 



By mean of P. 77 [Art. 546], it came out as 1-37 to i, but this last can not 

 be depended on, as wire for making communication with ground was forgot 

 to be fixed f. 



667] It should seem that the charge of D and E is increased \^ by spreading 

 of el. when elect, in usual degree, therefore if we suppose that the spreading is 

 insensible when electrified in very small degree, the charge of a glass plate is 

 less in proportion to that of another body when electrified with usual degree 

 el. than when elect, with a very small one in ratio of 1-26 to 1-51, or of 5 to 6. 



668] On plate air {. 

 [By Art. 517], 



P. 32 pi. air i cont. i inc. el. more than D) , 



> by mean I more than D. 

 33 f I 



The same plate air contained 2 inc. el. less when resting intirely on machine 

 than when resting by i corner. 



* [See Arts. 358, 539, 545.] 



f The comp. charge of the cyl. is 48-4 glob. inc. The real charge, supposing 

 that the wire contains 3-6 glob. inc. less when joined to cyl. than to D + E = 73-6, 

 and therefore its real charge exceeds the computed in the ratio of 1-52 to i. [See 



Note 25.] 



{ [See Art. 340.] 



