© HYoANGER 
+ PoLanisable quadrupoles 
Fig. 1. 
experimental data according to Kamuriincs Onnes and Braak. Over 
the whole range of temperature that is considered, the agreement 
proves to be very good. 
As in Leiden Suppl. N°. 39a § 5 we find further: 
for o the same value as was given there, but 
v= 1.34 X 10-14 
and the quadrupole moment: 
ik AU eg ee [e.s.e. x em”). 
As to the quadrupole moment of H, we thus really find, as was 
expected in Comm. N°. 65 § 4, a value deviating only little from 
that deduced by the calculations of Leiden Suppl. N°. 39a (see this 
Comm. § 2). 
Further we deduce still easily for uw, the following relation 
Mee = FLO 28.07 A Oy rng nae a) 
For the reasons discussed in § 3 this equation seems to me 
preferable to equation (6) of Desir Le. 
§ 6. Oxygen and nitrogen. For oxygen we may also apply 
equation (8). For nitrogen the coefficient will be a little different. 
For the moment however we omit a more detailed calculation of 
the quadrupole moments of these gases as these may only be 
deduced with little accuracy because of the relatively small 
temperature interval in which for these gases data on # are at our 
disposal (Comm. N°. 6a § 2). For this reason the small alteration 
introduced by attending to the polarisability of the molecules 
would be of no importance. 
