CONCLUSIONS 



231 



labU showing Lengths of diluted and heated Columns under varying Conditions of 



Dilution and Temperature. 



Diluted column. 





Heated column. 



03 O 



tH S^ <D 



per- 

 long 

 rms. 



Ti-i^ 



^s 2 ft 



73 a ^ 



C3 



<» 



cll . +^ 





med 

 emp 

 ocks 

 ;d. 



med 

 oft 



e in 

 shor 



S o is 

 m to 



tOt4-l >^ 



itD^t 





<| O CO 



Feet. 



<j 03 0*3 



<j <B oj 03 



Degrees F. 



Degrees F. 



100 



64 



1 



500 



69 



5 



1,000 



74 



10 



1,500 



79 



15 



2,000 



84 



20 



^ ° c 

 " fe 



w 



100 



500 



1000 



1500 



2000 



Per cent of dilution. 



O 



90. 



Feet. 



102.7 



513.5 



1,027.0 



1,540.5 



2,054.0 



75. 



Feet. 



102.2 



511.2 



1,022.5 



1,533.7 



2,045.0 



50. 



Feet. 



101.5 



507.5 



1,015.0 



1,522.5 



2,030.0 



25. 



Feet. 



100.7 



503.7 



1,007.5 



1,511.2 



2,015.0 



^ ^ s 

 rt to o) g 



^ tota jj 

 ^ :3 oj &I 



Feet. 



100.01 



500.3 



1,001.2 



1,502.9 



2,005.4 



Attention is called to a few significant points brought out by the 

 table. For instance, it appears that a 50 per cent dilution of a salt 

 water column at 63° Fahrenheit (the mean temperature of Argostoli) 

 will increase its head 1^ feet for the first 100 feet, while the increase 

 due to 1° difference of temperature is only 1/100 of a foot, or 1/150 of 

 the difference due to dilution. Again, the increased head due to a 50 

 per cent dilution in a 3,000-foot column is 30 feet, while the temperature 

 increment (between 64° and 84°) is only about 51/^ feet, and so on. 

 The table also brings out the fact that to bring about a flow at sealevel, 

 it being recalled that the inlet is some 3 feet below sealevel, a depth of 

 1,600 feet is required on the temperature hypothesis, while on the dilu- 

 tion hypothesis only 200 feet is necessary. 



Conclusions 



The constant influx of salt water at Cephalonia is unique, being dupli- 

 cated, so far as authentically reported, at no other point in the world. 

 It is not, therefore, to be expected that simple conditions, such as might 

 be reproduced at numerous points, will be found to exist at the sea mills, 

 for otherwise the phenomena would be almost certain to be found else- 

 where. It does not follow, however, that because some of the attendant 

 conditions are peculiar to the Cephalonia locality that the ultimate 

 causes are not of a simple and commonly recognized type. Both temper- 

 ature and dilution appear to be fully competent to produce circulation of 

 the kind observed at Cephalonia, but each requires the existence of cer- 



