847 



r>. Now ilie iiarainagiietic SRin|ile was lialiinced against wires put 

 not ill its immediate iieigliborliood Init at the shield. A correction 

 factor must be applied for this. The factor was determined exjieri- 

 mentallv h} lialanciiig tiie etfect of the same wire by A', first at 

 the tubes attached to the paramagnetic sample and second in the 

 suspended tube used in tiie compensation of the paramagnetic salt. 

 The ratio of the readings on <S' gave (he correction factor. The 

 determinations of the correction factor vary somewhat and a con- 

 siderable part of the experimental uncertainty is due to this. 



c. Finally a determination had to be made of the ratios of the 

 changes in K which had to be made in order to (••ompensale the 

 change in inductance produced by the combination of wires which 

 compensated the paramagnetic sample and the changes produced by 

 the standard accurately drawn wires. 



^ 4. Results for ankydrons Chroiniiiiii Chloride at the boi/i7i_q 

 point of hijdrogen. 



At a frequency of 3.69 X 10' tlie sample of chromium chloride 



was balanced by a combination of wires the etfect of wiiich was 



soon afterwards compared with the effect of one of the standard 



wires (2A^). The ratio of the ert'ects of the combination of wires 



6.0 

 to the effect of 2iV as measured by /\ was -— . The correction 



b.o 



factor due to the inhomogeneity of the field as measured on 2^^^ 



was -^ . Finally the correction for the length (the sample of chiominm 

 4.6 



1 8 3 

 chloride was larger than 2N) was — — -. (This was determined from 



Z -1 .0 



the results on iron wires cited above). The resultant correction is 

 6.0 6.3 18.3 



^'"'" 0^4:6 2U> = ^-^'- 



Again at the frequency 3.69 10° the wire IN has a ^ = 9.01 

 and hence 1 — ^{ (</) r= 0.841. Thus the volume susceptibility of the 



wire is x := — — = — 0.0669. Now the radii of the wire and of 



4 -T 



the sample were 0.705 mm. and 3.5 mm. respectively. Hence the 



A)705Y 

 volume susceptibility of the sample is x ^ 1.11 ;< i I X 



X 0.06692 = 0.00305. The weight of chromium chloride was 3.192 



3.192 



grams and its length 9.7 cm. ; the density is — ^ „ „ —0.85 



