MECHANICAL EQUIVALENT OF HEAT. 



TABLE 227. 



Method. 



Diminishing the heat contained in a battery 

 when the current produces work 



Diminishing the heat contained in a battery 

 when the current produces work . . . 



Heat due to electrical current, electro-chemical 

 equivalent of water = .009379, absolute resist- 

 ance, electro-motive force of Daniell cell, heat 

 developed by action of zinc on sulphate of 

 copper ........ 



Heat developed in Daniell cell .... 



Electromotive force of Daniell cell 



Combination of electrical heating and mechan- 

 ical action by stirring water .... 



Observer. 



Joule 7 



Favre 

 Weber, 

 Boscha, 

 Favre, 



and 

 Silbermann 



Joule 

 Boscha 23 



Griffiths -* 



Date. 



1843 



1858 



1857 



1859 

 1893 



Result. 



499.0 

 443- 



4I9-S 



428.0 



RKFERENCES. 



1 Joule, " Phil. Mag." (3) vol. 26. 



2 Him, " Theorie Mec. de la Chaleur," ser. i, 3me ed. 



3 Edlund, " Pogg. Ann." vol. 114. 



4 Haga, " Wied. Ann." vol. 15. 



5 Perot, " Compt. Rend." vol. 102. 



6 Rurnford, " Phil. Trans. Roy. Soc." 1798; Favre, " Compt. Rend." it 



7 Joule, " Phil. Mag." (3) vol. 23. 



8 Joule, 



9 Joule, 

 10 Favre, 



37- 



Phil. Mag." (4) vol. 15. 



n Pulnj, 

 12 Joule, 



Compt. Rend." 1858 ; 

 Pogg. Ann." vol. 157. 

 Proc. Roy. Soc." vol. 27. 



13 Rowland, " Proc. Am. Acad. Arts & Sci." vols. 15 & 16. 



14 Sahulka, " Wied. Ann." vol. 41. 



15 Violle, "Ann. de Chim." (4) vol. 22. 



16 Bartoli, " Mem. Ace. Lincei," (3) vol. 8. 



17 Quintus Icilius, " Pogg. Ann." vol. 101. 



18 Joule, " Rep. Com. on Elec. Stand.," " B. A. Proc." 1867. 



19 H. F. Weber, " Phil. Mag." (5) vol. ?. 



20 Webster, " Proc. Am. Acad. Arts & Sci." vol. 20. 



21 Dieterici, " Wied. Ann." vol. 33. 



22 Favre, " Compt. Rend." vol. 47. 



23 Boscha, " Pogg. Ann." vol. 108. 



24 Griffiths, " Phil. Trans. Roy. Soc." 1893. 



SMITHSONIAN TABLES. 



221 



