18 



RATIO OF SPECIFIC HEATS. 



tliaii the eijuivalent of the preissure ilift'ereiice, oi- in coii^iilerati'iii d' tlic '1\ values 

 applicaljle, by more than .2 'ji. 



A third complete measurement correspuiidiuL; to G'"'"'^ t)t' efflux, gavf u-; 25.03 

 cm. as the correct pi'essure value at the sulphuric-acid manometer. 



Tile agreement between the reduced values of observations lu.ulc under like 

 conditions on diflferent days was ei[ually satisfactoiy. 



The temperature measurements corresponding to the experiments to which the 

 above tables apply showed for the resistance IFo at Z, 



U\ = 70 + lO + 2* + I + .2 + .2* + .1 + .5, 



that there was a balance in the AVheatstone biidge iov the temperatuivs contained 

 in the following table. This table, moreovei', gives a good exhibit of the constancy 

 of temperature iu the water bath, here definitely below the temperature of the loom. 



Thus the temperature of the air imprisoned at a pressure excess of 25.00 cm., falls 

 duiing adiabatic expansion from 14.63° C. to exactly 8.00° C. 



The pressure comparisons made on June 13 and belonging to the given ex- 

 am[)le are among the following data, wlieie the temperature of the mercury was 

 is C. Owing to motion of the nicrcuiy columns in the tuljes an even iiunil)er of 

 observations is made for one lini!) and an uneven nninl)ei' for the other. 



!5.09 [cm., HgSO^] = 



6.50 [cm., Hgj. 



