MAHLER'S CALORIMETER. 65 



PERIOD AFTER MAXIMUM. 



9 minutes 13.82' 



10 " 13.81 



12 minutes 13-79 



13 " I3.78 



ii " .......... 13.80 



Rate of variation after maximum is 



a = '3- 8 4 ' 3-78 = 0.012 



The thermometer observations now stopped. 

 The gross variation in temperature was 



13.84- 10.25 = 3-59- 



The corrections are as follows : 



The system lost during the minutes (7, 8) and (6, 7) a 

 quantity of heat corresponding to 2a t . 



2a t = 0.012 X 2 = 0.024. 

 In the half-minute (5^, 6) it lost 



\(a t 0.005) = 0.0035. 

 But during the half-minute (5, 5^) it gained 



0.004 



- - = 0.002 . 



Consequently, the loss for the minutes (5, 6) is 

 0.0035 0.002 = 0.0015. 



