APPENDIX TO THE MECHANICAL EQUIVALENT OF HEAT 473 



Equivalent found 781-5 at about 59 F. 



Correction for thermometer 3-3 



Correction for capacity 1-3 



Correction for latitude -9 



Corrected value 787-0 



or 442-8 at 15 C. on the air thermometer. 



The other experiment, on sperm oil, made at this time, is probably 

 hardly worth reducing. The experiments of 1850 are of the highest 

 importance and should be accurately reduced. 



In the experiments with water the capacity of the calorimeter is cor- 

 rected as follows : 



Total capacity 97470-2 97309-8 



Therefore correction is -0016. 



Hence the result with water requires the following corrections : 



Joule's value 772-7 at 14 C. 

 Correction for thermometer 3-2 



Correction for latitude -9 



Correction for capacity 1-2 



778-0 



or 426-8 on the air thermometer in the latitude of Baltimore at the 

 temperature of 14 C., nearly. 



In the next experiment, with mercury, Joule determined the capacity 

 of the apparatus by experiment. The mean of the experiments was that 

 the apparatus lost 20 -33155 F. in heating 143430 grains of water 

 3 13305 F. To reduce these to the air thermometer we must divide 

 respectively by 1-0042 and 1-0056. Therefore the capacity must be 

 divided by 1-0014. Therefore the corrected values are: 



772-8 at 9 C. 775-4 at 11 C. 

 Correction for thermometer 4-4 4-0 



Correction for capacity 1-1 1-1 



Correction for latitude -9 -9 



779-2 781-4 



