﻿of the common Surface of two Liquids, 



379 



turpentine, and downwards in Nos. 1 and 2 in a tube moistened 

 with water. 



Table XIV. — Elevation in submerged capillary Tubes. 

 Water — Oil of Turpentine. 



No. 



2r. 



h. 



hr. 



« 12 cos w X2 . 



w 12 . 



1. 

 2. 

 3. 



millim. 

 0813 

 0-557 

 0-506 



millims. 

 54-9 

 79-9 

 56-4 



sq. millims. 

 2232 

 22-24 

 14-28 



mgrm. 

 1-265 

 1-260 



0-809 



O 1 











50 8 



The arrangement of the foregoing Table speaks for itself. The 

 last column contains the angle a> 12 as it results from the num- 

 bers in the last column but one together with the known value of 

 the constant (Table X. § 10), 



« 12 = 1*177 milligramme, 

 obtained from observation of the drops. For experiments Nos. 1 

 and 2 the angle g) 12 =0, and the agreement of the numbers ob- 

 tained according to the two methods is satisfactory. In No. 3 

 the angle was different and approached 47° 2', which I had 

 found from observation of the drops. 



The difference of the angle is explained by the difference of the 

 liquid layer which the capillary meniscus in its movement had 

 to drive away, and is connected with the difference already dis- 

 cussed (§ 14), which is shown in the neighbourhood of the 

 limiting surface by particles of the same liquid with different 

 substances. 



17. Similar experiments were made with bisulphide of carbon 

 as liquid 1, and water as liquid 2. In this case, however, a de- 

 pression of the capillary meniscus occurs; the convex side is 

 turned up towards the water. Hence the thickness of the layer 

 of bisulphide of carbon in the wide glass cylinder is correspond- 

 ingly greater as that of the layer of water above it increases. 



The capillary tube was filled with distilled water before the 

 submersion. The experiments gave the following results : — 



Table XV. — Elevation in submerged capillary Tubes. 

 Bisulphide of Carbon — Water. 



No. 



2r. 



h. 



hr. 



« 12 cos w l2 . 



w l2 . 



1. 

 2. 



3. 



millims. 

 2-652 

 0-964 

 0-888 



millims. 



-25 



-66-6 



-68 



sq. millims. 

 -3314 

 -3212 

 -30-21 



mgrms. 

 4-451 

 4-314 

 4-057 



180 

 180 

 180 









Mean 4274 





