Table 227. 



MECHANICAL EQUIVALENT OF HEAT. 



The following historical table of the principal experimental determinations of the mechanical equivalent of the unit of 

 heat li.-is been, with the exception of the few determinations bearing dates later than 1879, taken from Rowland.* 

 The different determinations are divided into four groups, according to the method used. Calculations based on 

 the constants of gases and vapors as determined by others are not included in this table. 



* " Proc. Am. Acad. Arts and Sci." vol. 15. 



Smithsonian Tables. 



220 



