[ 630 ] 
proportion to that in the other body, whatever' 
the thlcknefs of the plate may be, provided 
its thicknefs is very fmall in proportion to its ‘ 
breadth, or fmalleft diameter. 
For there can be no doubt, but what, under that 
reftriftion, the fluid will be difpofed very nearly in 
the fame manner in the plate, whatever its thicknefs 
may be j and therefore its repulflon on the fluid in 
the canal will be very nearly the fame, whatever its 
thicknefs may be. 
PROP. XXII. 
LetAB and DF (fig. 14.) reprefent two equal 
and parallel circular plates, whofe centers are ^ 
C and E ; let the plates be placed fo, that a ' 
right line joining their centers (hall be perpen* 
dicular to the plates ; let the thicknefs of the 
plates be very fmall, in refpecfl of tlieir diflance 
CE; let the plate AB communicate with the 
body H, and the plate D F with the body L, 
by the canals C G and E M of inComprelTible 
fluid, fuch as are deferibed in Prop. XIX ; let 
thefe canals meet their refpedive plates in their 
centers C and E, and be perpendicular to the 
plane of the plates ; and let their length be fo 
great, that the repulfion of the plates on the 
fluid in them may be confidered as the fame, 
as if they were continued infinitely j let the 
body H be overcharged, and let L be faturated. 
It IS plain, from Prop. XII. that D F will be 
undercharged, and A B will be more over- 
charged 
