﻿252 M. G. Quincke on the Capillary Phenomena 



The means of these numbers, together with the values of a and 

 a, as also the specific gravities a and observed temperatures, 

 are collected in the following Table : — 



Table II. — Capi 



lary Constants calculated from the heights in 

 the Capillary Tubes. 



No. 



Substance. 



a. 



a 2 . 



a. 



Temp. 



<T. 



1. 

 2. 



3. 



4. 

 5. 

 6. 

 7. 



8. 



Hyposulphite of soda 

 Water 



mgrms. 

 7-636 

 7235 

 3-343 

 3-271 

 2-765 

 2-733 

 2-566 

 2-237 



sq. mil. 



13-58 



14-47 

 5-273 

 7159 

 6-234 

 3-673 

 6-434 

 5-659 



millims. 

 3-684 

 3804 

 2-296 

 2-675 

 2-497 

 1-916 

 2-536 

 2 379 







21-9 



16-2 



18 



22 



21 7 



16-6 



223 



21-8 



11248 

 1- 



1-2687 

 0-9136 



0-8867 

 1-4878 

 0-7977 

 0-7906 



Bisulphide of carbon. 

 Olive-oil 



Oil of turpentine ... 

 Chloroform 



Petroleum 



Alcohol 





5. Some rectangular troughs, 25 millims. in height and from 50 

 to 70 millims. in length and breadth, were made of plates of very 

 pure plate glass stuck together with sealing-wax. The glass 

 trough was filled with the liquid to be examined and placed on 

 a horizontal glass plate before a cathetometer, whose horizontal 

 microscope or telescope was provided with cross-wires or a glass 

 divided as a micrometer, and whose horizontal and vertical dis- 

 placement could be measured to - 001 of a millimetre. The ho- 

 rizontal glass plate was cemented on a wooden stand provided 

 with three adjusting-screws. A narrower plate-glass cover was 

 laid on the glass trough filled with the liquid under examination, 

 and was placed horizontally by means of a level. With a clean 

 glass thread just drawn out before the lamp, of from 0*5 to 2 mil- 

 lims. diameter, it is easy, after a little practice, to blow an air- 

 bubble of suitable magnitude (about 20 or 80 millims. in dia- 

 meter) under the glass cover. The glass trough was so shifted 

 that the contour of the air-bubble, which was suitably illumi- 

 nated from behind, appeared sharp in the range of the micro- 

 scope, and then the heights K and k were measured as quickly 

 as possible. The objective of the microscope had a diameter 

 of 16 millims., and was about 120 millims. from the object. 

 The whole arrangement was similar to that which I had before 

 used for the measurement of drops of mercury*. 



The glass trough and plates must be as clean as possible, and 

 well wetted with the liquid under examination. 



In the following Tables are collected the observations on a 

 series of air- bubbles in an aqueous solution of hyposulphite of 

 soda, distilled water, bisulphide of carbon., olive-oil, oil of tur- 

 pentine, petroleum, and absolute alcohol. 



* Compare Pogg. Ann. vol. cv. p. 15, and pi. i. figs. 4, 5, 11, 12 (1858). 



