ON LATENT HEAT4 



Expcnments to afcertain the Latent Heat of Sulphur, 



&l 



Latent heat of 

 fulphur I43|*. 



In thefe experiments I have fuppofed, from experiments of 

 my own, the capacity of fulphur to be .189, which does not 

 materially differ from Mr, Kirwan's determination. In thfe 

 other cafes I have trufted chiefly to the numbers given ill 

 Thomfon*s Chemiftry, though thefe are not always wholly 

 unexceptionable. In every inftance I have fuppofed the femi- 

 liquid to have the temperature of the melting point, which I 

 believe is generally true ; but fome practice is required to fei2e 

 the moment before the frozen particles float in the fluid fub- 

 ftancei, In experiments on fulphur efpecially, inattention to 

 this circumflance caufes very great inaccuracy, and was the 

 caufe of confiderable embarrafljuent to mq before I obferved 

 my error. 



A comparative table follows of the caloric of fluidity of all 

 fubftances hitherto examined : 



Table of latent 

 heats. 



In all thefe inftances the latent heat is exprefled in degrees General rc- 

 meafured by the capacity of the relative folid, excepting in ^^^'^^^ 

 the cafes of fpermaceti and bees' wax, which are in degrees 

 meafared by the capacity of the fluid. I endeavoured to rec- 

 E 2 tify 



