﻿Capillary Phenomena of the common Surface of two Liquids. 371 

 In the equations of § 11, for this case we may suppose 



<7 l = 0, 



lg. 



At the moment of the spreading out a sudden change in the 

 form of the air-bubble is observed ; it becomes broader and flatter. 



The arrangement of Table XL, which gives a summary of the 

 observations, is the same as that of the former Tables ; the last 

 column contains the value of a 3 -fa 32 , as it was found from the 

 earlier observations on air-bubbles or drops of liquid in other 

 liquids (Table X. § 10). 



Table XI.— Flat Air-bubbles in Water 



»-•«> 



No. 



Substance 3. 



2r. 



K. 



Jc. 



K-L 



KV*. 



«. 



a. 



acalc. = 



« 3 + « 32 . 



1. 

 2. 



3. 

 4. 

 5. 



6. 



Bisulphide of carbon 

 Olive-oil 



ram. 

 28-6 

 307 

 100 

 200 

 20-8 

 28-6 



mm. 

 5-332 

 4-901 

 4-762 

 3803 

 3-808 

 5-310 



mm. 

 1-450 

 1-362 

 1-362 

 1000 

 0-939 

 1-558 



mm. 

 3-902 

 3-539 

 340D 



2-803 

 2-869 

 3-752 



mm. 

 3-770 

 3-465 

 3-367 

 2-689 

 2-693 

 3755 



mgrs. 



7-61 



6-26 



5-78 



3-920 



4115 



7035 



mgrs. 



7-11 



600 



567 



3-615 



3-625 



705 



mgrs. 

 7-531 



J5-856 



i 4-210 

 7067 





Oil of turpentine . . . 

 Petroleum 





Flat Air-bubbles in Olive-oil (|? =0-4568). 



1. 

 2. 

 3. 



Absolute alcohol ... 

 >» 



? 

 ? 

 ? 



3-770 

 3-701 

 3-534 



0-923 

 0-921 

 0-830 



2-847 

 2-780 

 2-704 



2-666 

 2-617 

 2-499 



3-204 

 3054 



2-890 



2-808 

 2-707 

 2-469 



1 2-825 



The calculated values of a 3 -f a 32 show an agreement with the 

 observed values of a and a which may be called a perfect con- 

 firmation of the theoretical considerations. The small deviation 

 in a for oil of turpentine shows that the angle co was not 180°. 



In the experiments on air-bubbles in olive- oil the alcohol very 

 soon drove away the oil from the horizontal glass plane, the air- 

 bubbles changed their form very considerably, the vertical meri- 

 dional element k disappeared, the air-bubbles spread themselves 

 to the edge of the horizontal glass plane (compare § 5) and va- 

 nished into the air. 



It may here be observed that very thin layers of liquid 3, 

 which showed Newton's rings on the air-bubbles, were quite 

 sufficient to produce the change of form of the air-bubbles. 

 When the traces of liquid 3 were even still less, so that they 

 could hardly have been recognized in any other way, a very re- 



