Velocity of Transmission of Disturbances through Sea-water. 519 



13°, 13-3°, 13-4°, 13-5°, 14-1°, 14-3°, 145°, 15-2°, 153°, 

 15-5°, 15-8°, 16°, 17°, 17-5°, 17-6°, 18°, 18'5°, 20° C. 



The densities are calculated for these temperatures, and also for 0'1° 

 below and above each. 



This was done in order to find the coefficient of expansion of the 

 sea- water, since this occurs in getting the ^adiabatic resilience frcm 

 the isothermal resilience. The result is as follows : — 



Temperature. 



Density. 



Temperature. 



Density. 



12-9° 



1-026676 



15-7° 



1-026086 



130 



1-0266567 



15-8 



1-026056 



13-1 



1-026636 



15-9 



1-026036 



132 



1-026616 



16-0 



1-026016 



133 



1-026596 



16-1 



1-025996 



13-4 



1-026576 



16-9 



1-025806 



13-5 



1-026556 



17-0 



1-0257856 



13-6 



1-026536 



17-1 



1-0257656 



14-0 



1-026456 



17-4 



1-0256855 



141 



1-026436 



17-5 



. 1-0256655 



14-2 



1-026416 



176 



1-0256355 



143 



1-026386 



177 



1-0256154 



14-4 



1-026366 



17-9 



1-0255554 



14-5 



1-026346 



18-0 



1-0255353 



14-6 



1-026326 



18-1 



1-0255053 



151 



1-026216 



18-4 



1-0254352 



152 



1-026196 



18-5 



1-0254052 



15-3 



1-026176 



18-6 



1-0253852 



15-4 



1-026156 



19-9 



1-0250449 



15-5 



1-026126 



20-0 



1-0250149 



15-6 



1-026106 



20-1 



1-0249949 



These values give the mean coefficient of expansion 0*000221 per 

 degree of temperature between 12'9° and 20'1° 0. 



Determination of the Resilience. 

 In accordance with the laws of thermodynamics, the adiabatic 

 resilience E<^ is taken to be ^Ee, where c^, c v are the specific heats 



Cv 



at constant pressure and constant volume respectively, and is the 

 isothermal resilience. 



Determination of the Ratio of the Specific Heats. 



The ratio c p ~c v is found as in Clausius (' Translation,' p. 181), 

 where it is shown that 



