﻿256 



M. G. Quincke on the Capillary Phenomena 



Table IV. — Capillary constants a of the free surface of Liquids 

 at the mean Temperature. 



No. 



Substance. 



Capillary 

 heights in 



tubes, 

 a= *Jkr. 



Drops. 



e. 



a cos 0. 



a = li — k. 

 a. 





1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8 



Mercury 



mgrms. 



7'636 

 7235 

 3-343 

 3-271 



2-765 

 2-733 

 2-566 

 2-237 



mgrms. 



55 030 

 7-903 

 8-253 

 3-274 

 3-760 

 3033 

 3120 

 3-233 

 2-599 



mgrms. 



44-600 

 7-580 

 7-850 

 3021 

 3625 

 2-716 



2-918 

 2-476 



1 



51 8 

 23 20 

 25 32 

 32 16 

 21 50 

 37 44 



36 20 

 25 12 



mgrms. 



7-256 

 7-449 

 2-768 

 3-490 

 2-398 



2 604 

 2-352 



Hyposulphite of soda. 

 Water 



Bisulphide of carbon. 

 Olive-oil 



Oil of turpentine ... 

 Chloroform 



Petroleum 



9 



Alcohol 







The value of a for chloroform, contained in this Table, was de- 

 rived from the height z on a moistened glass plane, where con- 

 sequently the angle a> was made equal to 0. It was found that 



~z =2-114 millims., 1'949 millim., 2'078 millims. ; 



or the mean of 



«=2047 millims., « 2 =4*191 sq. millims., a=3*12 milligrams. 



The values for mercury are taken from the observations given 

 in the following section. 



Notwithstanding the inexactness of the value of the angle 0, 

 which was only determined approximately, the numbers in the 

 last column, which almost agree with those in the third column 

 of Table IV., show how unjustifiable it is to assume that the 

 angle of the capillary meniscus in glass tubes is equal to zero, 

 and from the capillary heights to determine the capillary con- 

 stants of the liquids in question by the help of this assumption. 



The variations which exist in the numbers of the third and 

 last columns for oil of turpentine and bisulphide of carbon may 

 very likely be caused by a chemical change in these liquids, as 

 between the measurements of the flattened air-bubbles and ca- 

 pillary heights of these liquids there was accidentally an interval 

 of several weeks. 



6. For flattened drops of mercury on clean glass plates in the 

 air, measurements were made, in the shortest time possible after 

 the formation of the same, similar to those made for flattened 

 air-bubbles. Table V. gives the results. The values of K, fc } 

 and K— #are, of course, positive. 



