Chemistry and Physics. 1387 
by any force whatever; only the time in which the distance of the 
plates is changed a measurable quantity by the action of such a 
force is the greater the smaller the force. 
pull of 1 gram, 0°01 mm. in 1} minutes, 0°71 mm. in 7 minutes. 
7. ° bd be = . . ‘ . . . hd 
From this it is intelligible how, limiting the observation to a 
a 
not exactly, inversely pro rtional to the squares of the nitial 
distance; for plates of different sizes, they are to one another as 
the fourth powers of the radii of the plates; for different liquids, 
as the times in which, under equal pressure, equal volumes of the 
exterior fluid acts in apposition to the separating toree- 
theless, equilibrium does not ensue, because the t 
hydrostatic pressure between the plates has for its result a nese! 
mm of the exterior fluid and thereby, agai, a diminution of t es 
differe e pressures. The distance of the plates can 
again increased by the separating force, and the same process re- 
peats itself in a continuous manner. ; ae 
The author gives also an approximate theoretical solution é e 
problem, starting from the following consideration. The ves vtv 
