Table 227. 



MECHANICAL EQUIVALENT OF HEAT. 



Method. 



Diminishing the heat contained in a battery 

 when the current produces \vori< 



Diminishing the heat contained in a battery 

 when the current produces worlv 



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'' 



Favre 22 



Weber, 



Boscha, 



Pavre, 



and 



Silbermann 



Joule 



Boscha 23 



Griffiths 24 



Date. 



1843 

 1858 



1857 



1859 

 1893 



Result. 



499.0 

 4430 



4321 



4'9-5 

 428.0 



References. 



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



2 Hirn, " 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 Rumford, " Phil. Trans. Roy. Soc." 179S ; Favre, " Compt. Rend." 1858. 



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



8 Joule, " " " " 27. 



9 Joule, " " " " 31. 



10 Favre, " Compt. Rend." 1858 ; " Phil. Mag." (4) vol. 15. 



11 Puluj, " Pogg. Ann." vol. 157. 



12 Joule, " Proc. Roy. Soc." vol. 27. 



13 Rowland, " Proc. Am. Acad. Arts & ScL" 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. loi. 



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



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



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



21 Dieterici, " Wied. Ann." vol. 23- 



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



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



24 Griffiths, " Phil. Trans. Roy. Soc." 1S93. 



Smithsonian Tables. 



221 



