[ 359 ) 



Fig. 8. 



(o the side of aiitliraquiiioiie, the Iheoretit'al part, \n whose stead 

 wc get tlie three-phase-eui've, nmst heeome sinallci', and il \\[\\ 

 finally contract to a point of contact lying somewhere on \\\o ciirxe 

 AP. If therefore for a certain sniallei- Aalne of .r, the above mentioned 

 curves are drawn as lias heen doue by the dotted cnrves, the defor- 

 mation and (Hs[>lacement of the other curves mnst be snch. tliat 

 a point of contact can occnr on the line Al\ So tlie (pieslion is, 

 to what modification mnst the {p/J') cnrve of the fbn'd 0(|niHbrinms 

 1)C subjected, when it is traced for smaller valne of ,/■. 'J'ho answer 



(o tills (|nestion is given by the sign o 



</.r 



l)olli for the e(piili- 



brinms between two (hiid phases and for those between a llnid and 

 a solid phase, this (piantily is jiositive as a rnle. Only in a limited 

 I'Cgion re\(M'sal of sign may take jilace. Hut this docs not prevent 

 ns from socing ininiediately, that in tig. 7 for sniallei' xaliies of ,/■ 

 tlie main position of the li(pii<l-\apoiir cnr\-e will have to Ix^ lower 

 — and In older to be al)l(^ to touch the ciir\(' A/' the |)osltion 

 of this latter ciir\c mnst be as il is draNvn. If it had the other 



24 



Proceedings Royal Acad. Amsterdam. Vol. VI. 



