﻿of the common Surface of two Liquids, 



389 



Table XX. — Elevations in Capillary Tubes. Two Liquids, 

 Petroleum above; Water below. 

 0-0 = 0-791, <r tt =l, 



2a = 5*220 mgrms., 2a M = 15-068 mgrms. 



No. 



r. 



SrAcr. 



* u COS h)ou. 



1. 

 2. 

 3. 

 4. 

 5. 



millim. 

 0-955 

 0-613 

 0-343 

 0-204 

 0-160 



mgrms. 

 6-397 

 6-681 

 6-810 

 6-976 

 6-831 



mgrm. 

 0-588 

 0-730 

 0-795 

 0-878 

 0-805 







Mean 07595 



Petroleum above ; Sulphuric acid below. 

 <r o = 0-791, <r„ = l-83l, 

 2* = 5*220 mgrms., 2a M = 11*542 mgrms. 



l. 



2. 

 3. 

 4. 

 5. 

 6. 



0-955 

 0-613 

 0-343 

 0-204 

 0160 

 0-094 



2-483 

 2-820 

 2-641 

 3080 

 2800 

 3149 



-1-368 

 -1-200 

 -1-289 

 -1070 

 -1-210 

 -1035 







Mean —1-195 



Water above ; Chloroform below. 

 o-o=l, o-.= 1-497, 

 2a o = 15*068 mgrms., (2« M =5-724 mgrms.). 



l. 



2. 



0-843 

 0094 



1015 

 5-57 



-2-459 

 -4-746 







Mean ..*;. -3-652 



Analogous to the results of my experiments (§ 21), in those 

 made by Bede the meniscus of the common surface of petroleum 

 and water also turned its concave side, whilst that of the com- 

 mon surface of petroleum and sulphuric acid or water and chlo- 

 roform turned its convex side to the specifically lighter liquid 

 above it. 



Since the angle co ou is unknown, the value of the capillary 

 constant u on cannot be deduced from these experiments, as that 

 angle (chloroform and water perhaps excepted) must have been 

 between 0° and 180°. 



Phil, Mag, S. 4. Vol. 41. No. 274. May 1871. 2 D 



