48 Mr. P. J. Hartog and Dr. J. A. Harker 



on 



Time. 



h. 



m. 



4 



i7l 



4 



18 



4 



18J 



4 



19 



4 



i9i 



4 



20 



4 



201 



4 



21 



4 



«i 



4 



22 



4 



22j 



4 



23 



4 



23i 



4 



24 



4 



24i 



4 



25 



4 



2 5i 



heading. 



Notes. 



— 



Valve closed. 



18*140 



— 



— 



Reading missed 



18*170 



— 



18*176 



— 



i8*i8i 



— 



18*184 



— 



18*187 



— 



18*192 



— 



18*197 ... > 





18*201 





18-205 





18*209 

 18*214 



■ Final period. 



18*217 





l8'220 





l8*223 ••• ' 





Rise of thermometer per minute during initial period (4I1. 6' to 

 4 h. gj4') = -0165°. 



Mean temperature of initial period = i4°*553. 



Rise of thermometer per minute during final period (4I1. 22' to 

 4I1. 25i') = -oo74°. 



Initial temperature of calorimeter (4I1. 9' 50"= 14*588° 



Final „ „ (4I1. 22' = 18*197 



A/. 



3-609 



From the above data we can calculate graphically, in the 

 way described, the correction to be applied for each succes- 

 sive half-minute of the middle period; and we thus find 

 that the total correction is cr 11 8°. 



The corrected temperature - difference is therefore 

 (3'6o9-o*ii8) = 3*49i°. 



The other data of the experiment were as follows: — 



