r 617 ] 
Corollary, 
If DC”~* Is very fmall in refpea of CA”"'*, the 
particle D is repelled with very nearly the fame force 
as if the diameter of the plate was infinite. 
Lemma VIII. 
Let L and / reprefenft the two legs of a right 
angled triangle, and ^ the hypothenule j if the fhorter 
leg / is fo muchlefs than the other, that is very 
fmall in refipedt of 
fmall in relpe6t of 
For " — L'^ -1-/^1 
X i-h 
7HV 
i — 
3 ^ — nxn — 1 xl* 
8L^ 
— L3-" ~ 
2L”-‘ 8L”+* 
X 3— H X X 3— « xn— ix 
2L”~* 8L”+^ 
, &c. therefore 
3' — nxP 3 — «x« — ixl'^ 
, See# 
, &c. which 
is very fmall in refipeft of P~”‘, as is by the 
fuppofition very fmall in refped: of L”“*. 
Lemma IX, 
Let D C now reprefent the axis of a cylindric or 
prifmatic column of u-nifbrm matter ; and let the 
diameter of the column be fo fmall, that the re- 
pullion of the plate AB on it fliall not be lenfibly 
■different from what it would be, if all the matter 
VoL. LXI. 4 K in 
