390 Dr. N. Ernest Dorsey on the Surface- Tension of 



In the tables the concentrations are expressed in gram- 

 molecules per litre, and are given in the column marked 



^— pr ; t denotes the temperature in degrees Centigrade ; 



n is the frequency of the fork ; p denotes the density ; and 

 T t and T} 8 are the surface-tensions at f and 18° 0. respectively, 

 both are expressed in dynes per centimetre ; \ x is the observed 

 wave-length in terms of the scale-divisions of the dividing 

 engine, one division — 1*0328 centim. 



gm.-mol. 









T< 







litre 



t. 



n. 



\. 



9 



Tt. 



T 18 - 





NaOl. 













16-0 



63-07 



0-4858 



73-72 



73-64 



73-34 



0067 



17-2 





0-4852 



7344 



7356 



7344 



014 



17-8 





0-4849 



73-29 



73-58 



73-55 



0-22 



18-2 





0-4843 



73-01 



73-57 



73-60 



029 



186 





0-4843 



73-01 



73-78 



73-87 



NaCl. 







16-3 



63-07 



0-4858 



73-72 



73-64 



73-38 



012 



16-7 



,, 



0-4852 



7344 



73-70 



73-50 



029 



174 



,, 



0-4849 



73-29 



74-08 



73 99 



046 



17-7 



,, 



0-4840 



72-88 



74-16 



7412 



063 



18-5 



" 



0-4837 



7273 



74-37 



74-45 





NaCl. 













131 



6307 



0-4865 



74-03 



73-99 



7325 



0-17 



135 



,. 



0-4859 



73-76 



74-23 



73-55 



0-S3 



14-1 



,, 



0-4855 



73-57 



74-52 



73-92 



051 



15-0. 





0-4854 



7352 



7500 



74-54 



0-68 



190 



" 



0-4841 



72-92 



74-83 



74-99 





NaCL 













16-4 



62-96 



0-4863 



73 67 



73-59 



73-35 



0-088 



17-0 



,, 



0-4860 



73-54 



73-72 



73-57 



017 



173 



,, 



0-4855 



73-30 



73-73 



73-62 



0-25 



174 



" 



0-4849 



7301 



73-68 



73-59 



