( 774 ) 



TABLE XIV B 2 . Deviation from formula (1). 



ts 



iO* (Wi—Roi) 



= 1 



= 2 



i = 3 t = 4 



i = 6 



in "/„ of i? i 



i = i \i = 2 



= 3 



t = 5 t = 6 



-403°. 57 

 -135°. 71 

 -182°. 81 

 -195°. 27 

 •204°. 70 

 -21 2°. 82 

 -21 7°. 41 



+-1 

 — 1 



—2 

 



+7 



+ 1 



+9 







—9 





 +6 



+3 



+2 

 —9 

 2 



+2 



+1 

 — 17 



+10 



0.001 



0.004 

 0. 004 

 0.007 



0.001 



0.011 



0.C04 

 0.036 

 0.022 

 0.000 



0.01.= 



0.014 

 0.000 

 0.027 

 0.014 



0.005 



0.007 

 0.036 

 0.009 

 0.010 



0.004 

 0.077 



0.045 



The isotherm of — 212.°82 is best adapted to give an idea of the 



accuracy of the mutual agreement on account of its larger number 



of points. The agreement proves very satisfactory. The upper limit 



1 

 of the mean error may be put at ±— — - . 



_ u u u 



§13. Minima of pv. 



By means of the coefficients of table XIII the following minima 

 of the pv-curves were derived from the data of table XII. 



By means of the method of least squares the coefficients ot a 



parabola 



P = P< + P 1 (Püa) + P.{p°aY 



have been calculated from these data v ). They are : 



i) It is to be remarked that the less certain isotherms of — 104° and — 136° 

 are not used in this deduction. 



