Electricity on Metallic Bodies. 
273 
large quantity of electricity ; but experiment shows that the 
function of points and angular projections is the reverse of 
this when the plane of the conductor is perpendicular to the 
lines of force. It has shown also that the area of electrifica- 
tion, and, judging from the appearance of the electro-deposits, 
the quantity of electrification likewise, increases in an in- 
creasing proportion as the area of the plate increases, and 
furthermore that, with plates of a given area, the area of 
electrification (and probably the amount) is determined solely 
by the relation between the lengths and breadths of the plates. 
In the annexed table is sett ou the areas of the — electrifi- 
cations registered on plates differing in shape but of equal area, 
side by side with other particulars; and fig. 1 gives a rough idea 
of the appearance of the plates with the electro-deposit thereon*. 
Area in square 
millimetres. 
Dimensions in milli- 
metres. 
— electrifications in 
square millimetres. 
500 
100-0 X 5 
66-6 X 7-5 
500x10 
33-3x15 
22-4x22-4 

40 
180 
270 
370 
Fig. 1. 
* Facsimiles of these plates, and of others described in my former 
papers, are given in the second edition of Gordon's 'Physical Treatise on 
Electricity,' vol. ii. 
Phil. 'Mag. S. 5. Yol. 16. No. 100. Oct. 1883. X 
