440 



Mr. Lubbock on the Heat of Vapoi 



as 



p^z^Jcq' {\ + «9') 





?' _P\p'y -E) 



Pip y -E) 





1 f y-i-i 





[l-Ep ^ J 







y-l 



if 



^P " - ^ 



11 



y-1 - ^ 





1- £;j '' 





y-1 £ 





e.V='-* ^-"C, 





1 -J5p '^ 



[2] 



I-// 



if \og{l- Hq) = -u 



c being the number of which the hyperbolic logarithm equals unity 









^ = h'-' c 



if 





= 



1 -O) 



1 





M = 



1 



- i/'-''c-"4 



•"^c"' -1 + hV \ 



Since C+Z)(l+«0) = ^ + JS — ''. 



for atmospheric air. Elements de Fhysique, vol. i. p. 400, and by Navier, Lecons donneei 

 a VEcole des Fonts el Chanssees, vol. ii. p. 310, in the form 





