MOSSOTTI ON CAPILLARY PHANOMENA, 577 
_ 6. If the tube be not very narrow, then the depression is given by the formula 
_ AV V2. Vel. sin dg apt 
i 1 + cos 6 
l=r-+ (1— cvs 6) r V2, a= +20. 
_ 7. For a drop of large diameter, 27, of a fluid that does not wet the hori- 
zontal plane on which it is placed, the ie is expressed by 
a= WF eas , Fie BAS 
‘d 2 31 cos S 
l=r+(/2—1)r. 
_ 8. The maximum height @ to which we can raise a disc, applied to a fluid 
vithout the fluid detaching itself and falling back into the vessel that contains 
it, when the fluid is of auch a nature as to wet the disc, is expressed by 
a=rV2— 
aE r 
The weight of the fluid raised in this case is ae by 
2 
p=7m (revz—* == Ji 
3 
being the radius of the dise, and m the weight of a cube volume of the fluid, 
whose side is the unit of measure in which 7 and ¢ are expressed. 
9. If the disc is not os re the fluid, then we have 
ieee | As teh V2 wi 
| (@=21 ie He ad cos +) (a- Sone 
p=rmar+armrrsina. 
10. For water at the temperature 8°-5 centigrade, we have from Gay-Lussac’s 
T 
experiments, t = 3°8888, the millimetre being the linear unit; and 7? = 2 a. 
A denoting the density of the fluid, g gravity, T the contractile force of the free 
urface of the water. 
. mercury we have, from the experiments of the same philosopher, at 
a temperature of 8°°5 centigrade, t = 25547; and for the angle of contact 
a = 45°°30!. 
