﻿of the common Surface of two Liquids. 



383 



meter 2r oa in the experiments in question, since other sources of 

 error, such as the different widths of the capillary tubes, and 

 particularly the variableness of the angle <o in these experiments, 

 have a much greater influence, and my chief object was to prove 

 the dependence of the common mean elevation on the capillary 

 constant a of the surface of the upper liquid. 



For the same reason, in the observed magnitudes h and h u , 

 which always refer to the summit of the meniscus, the correc- 



tion -, or a corresponding value, has been omitted. 

 o 



In the 



calculation of the constants a ou cos co ou according to equation 

 (16), the magnitudes of the capillary constant a were used in- 

 stead of a cos co 0) as I had found them from the elevations in 

 capillary tubes (Table II. § 4). 



In the following Table the observations on bisulphide of car- 

 bon and water are collected. In the first series of experiments 

 the specifically lighter water was above ; the meniscus of the com- 

 mon surface turned its convex side upwards. In the second 

 series the specifically heavier bisulphide of carbon was above ; the 

 meniscus of the common surface had its concave side turned up- 

 wards. In the first series of experiments the meniscus of the 

 common surface rose in a tube which was moistened inside with 

 water, and in the second series in one moistened with bisulphide 

 of carbon. 



Table XVII. — Elevations in Capillary Tubes. Two Liquids. 

 Water above ; Bisulphide of Carbon below. 



o- =l, <7 M = 1-2687, 



2a = 14*47 mgrms., a ou =4*256 mgrms. 



No. 



2r . 



h . 



hu. 



2rh<r. 



a-ou COS uou- 



@ou. 





millim. 



millims. 



millims. 



mgrms. 



mgrms. 





1. 



0-316 



0-6 



62-4 



12-62 



-0-92 



77 21 



2. 



0-306 



1-4 



43-4 



8-62 



-2-92 



46 35 



3. 



0-268 



7-2 



35-2 



6-95 



-3-76 



27 56 



4. 



0259 



22-8 



31-8 



8-17 



-315 



42 15 



5. 



0-276 



34-9 



21-1 



8-50 



-2-99 



45 28 



6. 



0-093 



112-3 



35-2 



7*27 



-3-60 



32 14 



Bisulphide of Carbon above ; Water belov 



7. 



a = 1*2687, <r„=l, 





2a o = 6*65 mgrms., a OM =4*256 mgrms 





1. 



0-325 



1-8 



86-2 



14-37 



3-84 



25 33 



2. 



0-435 



2-0 



55-5 



12-63 



2-97 



45 44 



3. 



0325 



21 



64-9 



14-87 



4-09 



16 4 



4. 



0-247 



63-8 



4-4 



15-42 



4-36 







