﻿of the common Surface of two Liquids, 375 



Table XIII. — Flat drops of several Liquids on one another. 

 Flat drops of Olive-oil in Water ( ^T^ 1 =0*432) 



No. 



Substance 3. 



2r. 



K. 



k. 



K-k. 



kVi 



a,. 



a. 



a. calc. = 



a 13 + a 32' 



mgrs. 

 1 1-177 



1. 

 2. 



Oil of turpentine.... 



mm. 

 474 

 36-6 



mm. 

 8-877 

 8-972 



mm. 

 2-360 

 2 570 



mm. 

 6517 

 6402 



mm. 

 6-276 

 6-345 



mgrs. 

 1-835 

 1-770 



mgrs. 

 1-702 



Flat dropsofBisulphide ofCarbon inWater/^ 1 T" <7<2 --6-1343\ 



3. 



Oil of turpentine . . . 



271 



7526 



2-256 5-270 



5-321 



3-721 



3-803 1177 



Flat drops of Mercury in Water (^T^ 2 = 6"27lY 



4. 

 5. 



6. 

 7. 

 8. 

 9. 

 10. 





28-9 

 30 

 30 

 30 



i) 



361 



3-446 

 3192 

 3-276 

 3 122 



3-286 

 3560 

 3501 



0-885 

 0-984 

 1010 

 0-905 

 0942 

 1-098 

 0-849 



2-561 

 2-208 

 2266 

 2-217 

 2-344 

 2462 

 2-652 



2437 

 2257 

 2-316 

 2-208 

 2-324 

 2-517 

 2476 



41-31 



30-58 

 32-21 

 30-83 

 34-45 

 3802 

 4410 



3726 

 31-96 

 3365 

 30-58 

 3387 

 3974 

 38-44 



36-29 



1 2772 



1 32-77 



Oil of turpentine... 



>> 



The foregoing collection of experiments do not show at first 

 sight a satisfactory agreement of theory and experiment. 



This want of agreement depends on the difficulty of properly 

 taking into account the masses present at the point of section P 

 of the common surfaces. For the effect of the superficial ten- 

 sion a 23 at the common surface of liquids 2 and 3, only particles 

 of those liquids were considered ; the influence of the particles 

 of liquid 1 which were at P was quite neglected. This error 

 is greater the greater the mass of these particles of liquid and 

 the greater the density of the liquid 1. In like manner with 

 respect to the effect of the forces a l2 and a a „ the minute quan- 

 tity of liquids 3 and 2 respectively present in the point P was 

 neglected. 



This difficulty is so much the greater, since the density of the 

 liquids 2 and 3 (which touch each other in the point P within a 

 distance from that point which is less than the radius of the 

 sphere of action) may easily be modified by the presence of a 

 particle of liquid 3. 



The particles of liquid on the surface possess quite differ- 

 ent properties from those within the liquid, and certainly dif- 

 ferent properties according to the nature of the body by which 



2C2 



