LIQUIDS AND ALLIED EXPERIMENTS. 



65 



As a whole, these experiments show the absolute necessity of long inter- 

 vals of observation. Whether it be a gradual decline in temperature or 

 solutional effects, or whether fresh solutions or even water require a long 







Tablf 



21. 



Chapter. 



Vessel. 



1 



IO 10 K. 



1 



Remarks. 



II 



IV 



H 



E 



EE 

 F 



! 0.83 

 .90 



•37 

 •64 

 •79 



Single tube. 



Double tube. 



Long diver. Short interval. 



Diver shortened. 



Long diver. Long interval. 



time-interval to reach rigorously normal conditions of equilibrium, the 

 result is patent that the true diffusion rates do not appear until the time- 

 interval has been prolonged sometimes as much as five or six weeks. Even 



Table 22.— Air-air through water. Vessel H (double tube). Constants as in table 23. 



Date. 



Oct. 26 



28 



2C) 

 30 



Nov. 1 



2 



4 

 5 

 6 



7 

 8 



9 

 1 1 

 12 

 13 



Barom- 



t 



eter. 



75-66 



O 



22.7 j 



• 76.20 



21.8 



76.58 



20.6 



75.80 



21 .9 



75-91 



20.0 



75.62 



20.7 



; 77-33 



18.3 



76.89 



20.8 



7682 



22.4 



76.02 



24.2 



7507 



24.0 



; 75-55 



19.3 



76.33 



19.5 



, 75-85 



19.5 



76.17 



19.5 



// 



I'o 



I') 



88 



15 



'7 ! 



15 ! 



48. 



78' 



4i 



94 



78 



12 



59 

 50 



'5 

 03 



599 

 504 

 462 

 442 

 386 

 403 

 298 



3" 

 329 

 370 

 403 



35i 



254 

 224 

 214 



Date. 



Barom- 

 eter. 



Nov 



75.69 



75-72 

 76.52 

 76.26 

 7629 



75-97 

 76.31 



75-94 

 76.08 



74.91 

 76.20 

 76.38 

 76-95 

 76.79 



19.5 

 19.5 

 19. 1 



18.6 

 18.3 

 18.1 

 17.9 

 18.0 

 18. 1 

 18.0 

 18.0 

 17.8 

 17. 1 

 17- 5 



H 





Vq 



61 .00 



5. 211 



60.79 

 60.57 



5 

 5 



193 

 181 



59-81 



5 



123 



59-42 



5 



095 



59- 13 

 58.98 

 58.79 



5 

 5 

 5 



073 

 064 

 046 



58.59 

 58.31 

 58.11 



5 

 5 

 4 



027 

 005 



987 



57-72 

 56.80 

 56.26 



4 



4 

 4 



957 



888 



837 



OctU 31cMv.5 .10 



25 30 



Fig. 20. — Chart showing loss of standard 

 volumes of gas in diver in lapse of 

 days. Diffusion of air through water. 



if the curve is smooth, it is always hazardous to assume that the true diffu- 

 sion rate has been exhibited within a month. 



The double -tube apparatus H charged with fresh water and air showed 

 the diffusions contained in table 22 and fig. 20. 



