237 



TABLES 255-257. 



MECHANICAL EQUIVALENT OF HEAT. 



TABLE 255. Summary. 



Taken from J. S. Ames, L 'equivalent mecanique de la chaleur, Rapports pre'sentes au congres 

 international du physique, Paris, 1900. 



TABLE 256.-Reduced to Gram-calory at 20 0. (Nitrogen thermometer). 



* Admitting an error of i part per 1000 in the electrical scale. 



The mean of the last four then gives 



1 small (20 0) calory = 4.181 XlO 7 ergs. 



i small (15 C) calory 4.185 X io 7 ergs assuming sp. ht. of water at 2o=o.99go. 



TABLE 257 . Conversion Factors lor Units of Work. 



* g = 9.80 m. per sec. per sec. at latitude 45, sea level, 

 t g = 32. 2 ft. per sec. per sec. " " " " " 



SMITHSONIAN TABLES. 



