JJ 



Temperature on the Specific Heat of Aniline, 73 



JQ 



The value of — r^ ha vino- heen ascertained as above indi- 

 dt & 



cated, the capacity for heat of calorimeter and contents is 



easily deduced. 



The operations are shown in Table Y. 



Col. I. gives the temperature of the null point in de- 

 grees C. of the air- thermometer (from Table IY.) . 



„ II. the rate of rise at the null point as deduced from 

 the group of experiments at that temperature 

 (from Table IV.). 



III. the value of the mean centimetre of the bridge- 

 wire at the temperature of the null point, denoted 

 by C 6 . 



IV. gives the rate of rise when R=l true ohm and the 

 potential-difference 1 volt (« = 1-4342, e 2 = 2*0570), 

 expressed in degrees C. of the air-thermometer. 

 The value of B/ used in this reduction is 8*4966 

 instead of the 8*5 ohms which was selected as a 

 convenient arbitrary value of R/ in the reductions 

 in Table IV. The two w r ires connecting the roof 

 of the calorimeter with the steel lid had a total 

 resistance of *0068 ohm. We may assume that 

 half the heat generated in these wires passed into 

 the steel lid, and half into the calorimeter. "We 

 may therefore consider their resistance as '0034 

 ohm^?'. Now the points which were kept at a 

 constant P.D. were at the lid of the calorimeter 

 and between these wires and the coil. The equa- 

 ls 2 / r \ 



tion is J.H. = ;p-( 1 + tt- )t ; hence the effective 



resistance Bi— r= 8*5 — '0034. 

 V. gives the reciprocals of the numbers in Col. IV. 



VI. The value of J is assumed as 4*198 *. The 

 numbers in this column give the capacity for heat 

 of calorimeter and contents expressed in terms of 

 "a thermal unit at 15° C." The results when 

 plotted as ordinates, with 6 X as abscissa, are shown 

 in Plate II (a). 



* Proc. Roy. Soc. vol. lv. p. 24 (1894). 



