105(1 



(A,, - />„) : b^ = 0,8901 ; .r„ ^ 0,3858 



Hence we have for y = 0,9 : 



It follows fVoin this snrve), what is of importance foi- practical 

 pnrj)Oscs, that the direction of the curve /> =/(v) very soon — name!}' 

 at about v=zO,Qvk' — approaches the final direction given b}' 

 {b — h^) : {v--Vq) = 0,'SSi^. I observed already in II p. 935 that since 

 //',, =z 0, the final part of the cui-ve will have pretty much ihe shape 

 of a stralc/ht line. This is actually the case ; already fort' : v^ = 2,34, 

 where {b — b^):{v — z;J=r 0,373, the direction does not differ much 

 from the final direction. We introduced just now the quantity Vk' marked 

 in this and the followiiig tables hy an * ; by this is meant the value 

 of V which iruuhl correspond with vjc, if the considered substance 

 had its critical tenii)erature at the assumed temperature (here ± 450°). 

 Then namely y = 0,9 = y// . and hence r// : ?>„ = 2 (yjt' + 1) = 3,8, 

 so that r = 2,34vu is then r= 0,(i ^'a-- . 



/,. y — 0,75 . iT=± 150 absolute). 



For '11 we lind 5,25, and further ; 





v« 





(/^,_^„):/>„ = 0,5 1/21:16 ; .t-, 

 giving : 



0,2 1/4,2 



