'Ü1 



^/^=v;+A-^~-j ^'^ 



where : h.^ = the measured ascension of the solution. 



X;, = the susee|)tibility of tiie air which is above the meniscus 

 of the solution. At 20° C. and a pressure of 760 mm. 

 ^' = 0.0294.10-0. 



Therefore k, = 0.0294.1 0-6 p- (~ 

 ' 760 V T 



where p^ indicates the atmospheric pressure decreased 



with the moisture of the air. 



y, ^ the density of tlie solution. 



h =r the measured ascension of the water. 



k = the susceptibility of tiie air which is above the meniscus 



of the water. 



7 = tlie density of the water. 



If the solution contains ,r7u of the nickelsalt, we have according 



to Wiedemann's law : 



(100 —ic) y.u>ater + xXyisah , ^,, 



^L- 100 • • • • ^''^ 



This Y-^isait multiplied by tlie molecular weight of the nickelsalt 

 in question gives the molecular coefficient of magnetisation •/'"• 

 From X'" the coefficient of magnet isation •/" of the nickelatom has 

 been deduced by making a correction for the diamagneiism of the 

 anion. 



These were taken : 



Y'« = — 0.40 . 10-6 



5fso. =- "•37. 10-6 



^(N0.). = -'-=''^-''~' 

 which values have been deduced from those given by Pascal by 

 making a correction for the value of Xwaicr, which Pascal has taken 

 — 0.75. 10-6. 



The formula a„ =^y^{y"y, . '3RT) gives ö„ the magnetic moment of 

 the nickel pro gramatom at the absolute zero of temperature. 



n = " — tinallv gives the number of magnetons of the nickelatom. 



1123,.5 ■' ^ ° 



§ 2. In the first place the aqueous solutions of NiSO,, NiCL and 

 Ni(NO,)j were investigated. 



They ha\e been prepared from distilled water and cobaltfree 

 nickelsalts from Kahlbaum. 



17* 



