444 Hormell— Dielectric Constant of Paraffins. 



Position of fourth node. 



1st set of readings. 2d set of readings. 



121-90 122-10 



121-45 121-60 



122-05 122-30 



12200 121-70 



122-05 122-30 



121-65 122-00 



122-10 122-05 



122-05 122-30 



122-40 121-80 



122-15 122-50 



121-99 122-0' 



122-07 

 121-99 



122-03 

 39-24 



82*79 = scale reading for position 

 of node. 

 82-79 = scale reading for position of node. 

 •30 == scale correction. 

 •90 = bridge correction. 



3) 83-99 



27'99 = length of half wave in paraffin. 

 40-85 =/l = 1 . 4e(1) 



27-99 



2 



r40-85T -r^ / » 



W^Tr, = K= 2-13(0) 

 L.27-99J v ; 



By a very simple device the primary of the oscillator was 

 replaced by one 4 cm in diameter and under this was placed a 

 secondary of corresponding diameter. With this combination 

 the half wave in air was 30-66 cm . With a 3 cm primary the 

 half wave in air was 20*85 cm . By a happy coincidence which 

 was not altogether fortuitous, the columns were long enough 

 to contain within the limit of error three half waves of the 5 cm 

 primary, 4 half waves of the 4 cm primary, and 6 half waves of 

 the 3 cm primary. 



Table VI exhibits a comparison of the melting points, den- 

 sities, indices of refraction and dielectric constants of the 

 paraffins and the two kinds of oils for the three different wave 

 lengths. The dielectric constant of the oils, however, was 

 determined for only one wave length. In the last two col- 

 umns will be found the light index of refraction for the D line 

 and the corresponding dielectric constant. A comparison of 



