311 



fa a, a, \ 



is at once found from 



?« = « — (nj «/ + //,«,•). 



Now 



a a f a a\ a a , 

 - = -+ ] = Av, 



in which v^ = ?2,v/ + ?^,v/, and v — v, ^ A is written. Further 

 d^ :^ (?ij|,^a, -|- /2,l/a,)", and from this follows: 



a f a, a.\ (t;/ y/a, - v," [/a,)' 



n, h n, — 



w„ V V" v"/ ' ' v.u.'v 



"^l '^J 



Hence : 



to = 71, W, 



"1 ' s 



t" u, r, \ vv 



+ p + At; . . . (1) 



Remarks, a. Formerly^) the following equation was written: 



- = - + f^ {v-h)Jrp{v-h) - {n, + nj i^^Y 



on account of the equation of state. Tiiis gives: 



a a a f fv — 6\*\ 



hence : 



for which e^^e' -\-k'T — "/è was written — with an apparently 

 perfectly justifiable neglect of some terms. Then we get: 



(6, l/a, - h, l/a,)' 



xo =. n, n. 



bb, b. 



It is seen that the very essential term — Lv is omitted. 



b. We might also have written: 



a a a, (y, \/a, — v, ]/a,y 

 - r^: Wj \-n, n, n, , 



in which v, = --— and v. = - — . For according to a property of the 

 dn, d;2, * f t- j 



1) Gf. among others Zeitschr. f. physik. Ch. 63, p. 219 (1908). 



20* 



