Stress and Strain on the Properties of Matter. 493 



Experiment I. — The brass envelope heated to 100° and afterwards 

 plunged into 450 grams of water contained in the calorimeter. 



Number of 

 observation. 



Average rise of temperature 

 of the water and calorimeter 

 per degree of fall of tem- 

 perature of the envelope. 



Departure from the 

 mean value. 



1 



•01138 



+ -000024 



2 



•01115 



+ -oooooi 



o 

 o 



U11UO 



— UUUUUo 



4 



•01121 



+ '000007 



5 



•01103 



- -000011 



6 



•01121 



+ -000007 



7 



•01102 



- -000012 



8 



•01089 



- -000025 



9 



•01125 



+ -000011 



10 



•01136 



+ -000022 



11 



•01091 



- -000023 



12 



•01130 



+ -000016 



13 



•01141 



+ -000027 



14 



•01096 



- -000018 



15 



•01115 



+ -oooooi 



16 



•01112 



- -000002 



17 



•01105 



- -000009 



18 



•01107 



- -000007 





•01114 





The probable error of the mean value is not more than 0*22 per 

 cent., and the probable error of the mean value of the other set of 

 eighteen observations was not more than 0*16 per cent. Experiment II 

 furnishes a fair sample of the accuracy of the work. 



