( 291 ) 

 If in MRT=: y.pv we put the value of v, we find 



MRT = ph 



f-^ 



With ƒ = 4 and k=z— the factor of pb = 8, and with ƒ = 7 and 



o 



15 1 



;: == — this factor is found to be only slightly different viz. 8 — . 



^ I o 



For the calculation of the value of b in the critical condition we 

 get therefore : 



_MRrf—>i Ty 1 ƒ— X 



a 

 If we put the value of v in the equation — - = ƒ — 1, we find: 

 ^ pv 



P 





The factor of b\ which with ƒ = 4 and x =:— has the well known 



o 



15 

 value of 27, is found slightly above 27,8 with f =7 and ^ = -r' 



If in MRT ^^y-pv we substitute the values found for j) and v, 

 we find : 



a n if — y) 



MRT=z 



8 , .„ 8 a . ^ 



If we again put ƒ = 4 and >« = — , we find MRI — — —; with 



-J K "I 



/'=:7 and x = — the factor - is equal to -—--; also this value dif- 



-■' 4 Ö.440 



8 1 



fers but little from — : = 



27 3.375 



For the calculation of a with the critical values of T and p, the 



formula : 



(MRTYf-l 



a = p 



p y. 



holds. 



f—\ 27 1 3 



The factor--^ is ecpial to — = ^-^ with ƒ = 4 andx = -. With 



15 96 1 



/'=7 and '^- = j it '"^ ^%^^^^ only slightly different, '"'^'^■^l — Yïi' 



20* 



