292 



The following table gives the results of the experiment : 



P2 



01 



Ri 



R 



2 



A 



B 



A— B 



^^ 



©2 



y 



74.14 



294.— 



2.2 



100100 



94.6 



25.- 



69.6 



78.44 



289.4 



1.3888 



75.26 



294.05 



2.2 



100100 



95.9 



24.- 



71.9 



79.70 



289.35 



1.3910 



74.72 



294.2 



2.1 



109500 



89.5 



30.- 



59.5 



78.39 



290.34 



1.3803 



74.5 



293.9 



2.1 



103800 



89.7 



30.- 



59.7 



78.19 



289.81 



1.4802 



75.19 



293.95 



2.1 



103800 



90.9 



29.2 



61.7 



79.— 



289.71 



1.4160 



75.49 



293.1 



3.2 



100300 



145.- 



46.4 



98.6 



81.58 



286.6 



1.4042 



74.99 



293.7 



3.2 



100500 



145.- 



47.- 



98.- 



81.04 



287.47 



1.3872 



74.99 



293.5 



3.2 



100500 



144.7 



46.3 



98.4 



81.07 



287.1 



1.3945 



75.06 



293.6 



4.7 



101200 



169.- 



22.1 



146.9 



84.14 



284.3 



1.3927 



74.84 



294.1 



4.7 



100700 



170.- 



21.8 



148.2 



84.00 



284.51 



1.4027 



75.52 



293.8 



4.- 



100000 



158.1 



33.6 



124.5 



83.21. 



286.2 



1.3704 



74.76 



" 



5.- 







174.2 



18.2 



156.2 



84.41 



283.89 



1.3938 



74.76 



' ' 



4.- 







159.0 



33.5 



124.5 



82.45 



285.81 



1.3921 



74.76 



' ' 



3.- 







142.0 



50.- 



92.- 



80.44 



287.81 



1.3911 



74.71 



' ' 



6.- 







195.- 



7.- 



188.- 



86.33 



281.96 



1.3974 



74.71 





6.- 







195.- 



7.- 



188.- 



86.33 



281.88 



1.4013 



74.57 



' ' 



5.- 







178.5 



29.3 



154.6 



. 84.12 



283.86 



1.4001 



74.57 



' ' 



4.- 







162.1 



40.3 



121.8 



82.09 



285.84 



1.3997 



74.57 



' * 



3.- 







146.5 



57.3 



89.2 



80.08 



287^84 



1.4040 



74.57 



' ' 



2.- 







132.5 



73.7 



58.8 



78.20 



289.83 



1.4005 



74.44 



293.82 



1.- 







118.2 



88.8 



29.8 



76.25 



291.83 



1.3925 



Average 



Av. for last 10. 



.1.3957 

 .1.3973 



P; is the reading of the barometer. Gj is the original temperature 

 of the bath. A and B readings of the oil manometer. P^ =P„ (A — B) dj/d. 

 ^Yhere da = density of oil and do = density of mercury. B ; is the tempera- 

 ture as given by the thermo-couple required to secure a balance. 



7 = ratio of specific heats. 



DISCUSSION OF RESULTS. 



The limits of precision seem to be the precision of the resistance, the 

 l)recision of the temperature reading as read by a thermometer, the pre- 

 cision of the temperature readings used to calibrate the couple, the con- 

 sistency of the E. M. F. of the battery and the density of oil. 



The precision of the resistance was none too good. The last ten ob- 

 servations were made with the best box available and R- kept constant so 

 that errors due to Ro were obviated. The maximum variation of the mean 

 of these observations is less than * per cent., and shows remarkable con- 

 stancy. 



