FERGUSON AND DOWSON, Studies in Capillarity 



TABLE II.— (Benzene). 



6 = 15-5° C. p 1 = 0-8555. p = 0-8837. log A = 1-6162. 



Manometer Readings. 



Reading 



s for Immersion of Tube. 



Open Limb. 



Closed Limb. 



Difference = h\. 



Needle Point. 



End of Tube. 



Difference = h. 



ins. 



ins. 



ins. 



ins. 



ins. 



ins. 



7-658 



6739 



0-919 



2*266 



2-181 



0-085 



7*657 



6738 



0-919 



2-267 



2-181 



0-086 



7-658 



6-736 



0-922 



2-268 



2-181 



0*087 



7-658 



6-738 



0-920 



2-269 



2-183 



0-086 



7-658 



6736 



0-922 



2-268 



2-180 



0*088 



7-658 



6738 



0-920 



2-258 



2-173 



0-085 



7'659 



6-736 



0-923 



2-258 



2-170 



0-088 



7*659 



6737 



"0-922 



2-257 



2-171 



0-086 



Mean h 1 = 



0-921 



Mean h = 



0*0864 



Hence p^ — ph = 0-7882 - 0*0763 = 0*7119. 

 And from (viii) 



T 15 . 5 = A x 0*7119 + 0*16 = 29*58 dyne-cm- 1 . 



The relation between surface tension and temperature in the case of 

 benzene is given by 



Te = T (1 - b6y 

 = T (1 - nbB) 

 for small variations in the temperature, where we may take n = 1*21, 



TABLE III.— (Toluene). 

 0=i5*o°C. Pi = 0*8559. p = 0*8715. Log A = 1*6162. 



Manometer Readings. 



Reading 



s for Immersion of Tube. 



Open Limb. 



Closed Limb. 



Difference = hy. 



Needle Point. 



End of Tube. 



Difference = h. 



ins. 



ins. 



ins. 



ins. 



ins. 



ins. 



8-432 



7-56i 



0*871 



2*636 



2*595 



0041 



8*430 



7-562 



o*868 



2*636 



2*594 



0*042 



8-430 



7'563 



0*867 



2*634 



2-596 



0*038 



8-430 



7-564 



0*866 



2*635 



2*595 



0040 



8-430 



7-565 



0*865 



2*637 



2*597 



0*040 



8-428 



7*566 



0*862 



2*635 



2*595 



0*040 



8-429 



7*567 



0*862 



2-636 



2*597 



0*039 



8-443 



7-579 



0*864 



2-636 



2*594 



0*042 



Mean h 1 = 



0*8656 



Mean h = 



0*0402 



Pi h x — ph — 0*7400 - 0*0350 = 0*7050. 



T 15 = A x 0*7050 + 0*16 = 29*13 + 0*16 = 29*29 dyne-cm. 



_i 



