SATURATED STEAM. .1 W> 



15 



one pound of water from 62* to 63* F. Thin agrees subttantially with the 

 definition -f the calorie, at the heal required to raiae ooe kilogramme of 



in I."** U* 16 



In ih.- tal.lt s for oilier vapors than steam, the old definition for the calorie. 

 I value for the heat of the liquid, are retained, to avoid entire 

 recalculation. 



Mechanical Equivalent of Heat The mechanical equivalent in metre- 

 kilogramme* of one calorie at 16|* C., deduced from Rowland'* experiment* 

 third column of the table on page M . 



ce the value given by Joule i* commonly quoted, it will be of interest 

 comparison of hi* latent * itowland's, aa given in 



. 



Joul*'. ValM * 



r I hrrntc 



, . 



. . 





77:7 



77.'. ! 

 77- J 



77-:. 

 777." 



*JU 



BM) 



n 7 



4_" . 



5:7' 



m 



m 



ititmle 39 17, to 980.05 centimetre* there- 

 reducing to I > .-! latitu.l, . and at the tea level, the value of the 

 mechanical equivalent of beat is 



J = 426.9. 



To reduce to the English system, multiply by |, and by the length of the 

 metre in feet, so that 



J = 778. 



Total Heat This term is defined as the heat required to raise a unit of 

 weight of water from freezing point to a given temperature, and to entirely 

 evaporate it at that temperature. The experiment* made by Regnauh 



reverse order ; that is, steam was led from a boiler into the calorimeter, 



and there condensed. Knowing the initial and final weight* of the caiori- 



the temperature of the steam, and tbe initial and final temperature* 



uf tlu- wat. r in the calorimeter, he was able, after applying the 



correction*, to calculate the total beats for the several experiment*. 



A* a conclusion of the work, he give* the following value* for 



beat-: 



10* 610 Bj equation, 609.0 



M r,L:, 6*6.* 



100* 



i .;. 



