316 Unwersity Geological Survey of Kansas. 
OPTICAL PROPERTIES OF THE DISTILLATES OF KANSAS OILS. 
1. Index of Refraction. N 25D. 
The following table shows the index of refraction of the distil- 
lates as determined at 25° C. by means of an Abbe refractometer. 
The observations were made by Mr. Harvey G. Elledge: 
Kerosene distillates. Vacum distillates. 
Field No. Se ee a cae ta ee 
150°-200° | 200°-250° | 250°-300° | 170°-200° | 200°-225° | 225°-250° | 250°-275° | 275°-300° 
Bins tee ere ema eee Len egret bl ee SNOT Ee ere te eau Mi aso coalbs oo ooo 
Seek. lteaeege WAAL |} UZ LAS} aL leat fh aL ARO. oso occclls oc occcclloocc 06 : 
erate teria 1.4260 | 1.4448 | 1.4607 | 1 4696 | 1.4767 | 1.4827 | 1.4888 |........ 
Bl Gaeta aaa a es IL 2 PASS} || IE aM | aL aie tt IL AUS |] AL A beiase/ |] IL AR | IL AES ooo nooo 
PAV Sto ne 1.4262 | 1.4458 | 1.4594 | 1 4697 | 1 4763 | 1 4834] 1 4886 | 1.4947 
LSC Sea ies nae 1.4284 | 1.4415 | 1 4785/1 4697 | 1.4772 | 1.4883 | 1 4894 | 1.4959 
Aine sate oe 1.4292 | 1.4504 | 1.4686 | 1.4722 | 1.4787 | 1.4847 | 1.4913 | 1.4962 
Ils yeeines alec 1.4271 | 1.4447 | 1.4607 | 1.4704 | 1 4776 | 1.4837 | 1.4896 | 1.4957 
2 ees ates cee WAZ 39 MAA SN AAS TO RAT O45 SIAR SIGs ee lr O47 ele b 00S 
nS Dea ae es a 1.4258 | 1.4451 | 1 4612 , 1.4612 | 1 4787 | 1.4868 | 1.4920 | 1.4977 
[RA ese NZS | il aes |p aL AU al4e LAI || IL AOS Joos co cont LT Looccoce 
Nea os ait nate ee 1.4245 | 1.4453 | 1 4608 | 1.4727 | 1 4801 | 1 4867 | 1.4951 | 1.4973 
DRE et one DEERE 1.4259 | 1.4460 | 1.4641 | 1 4736 | 1.4806 | 1 4876 | 1.4933 | 1.4989 
dE) hoes Neer ah a 1.4282 | 1.4480 | 1.4589 | 1.4714 | 1.4767 | 1.4834 | 1 4907 | 1.4968 
So eee ae 1.4221 | 1.4499 | 1.4629 | 1 4713 | 1.4787 | 1 4848 | 1.4918 | 1.4955 
Bocconccce | APRS |) UL Guy | LAR | IL AB IL ARR es on IL AQSilos oo 60d 
A a A ea aor, || too, |} LAS | IL ZUG IL ASS | oo cool 1h AOR so oo 0006 
OR tee ae one, finome, | Zl | il 47S® | il 4QMee lo. 5 coll LL ON CAtlooonc000 
ER ee ee none. | 1.4554 | 1.4634 | 1.4722 | 1 4797 | 1.4871 | 1.49389 | 1.5000 
Average. .| 1.4268 | 1.4454 | 1.4610 | 1.4717 | 1.4780 | 1.4847 | 1.4913 | 1.4972 
200m 2o0ne + 250°-300°. 
It is the opinion of the writer that the index of refraction 
of the petroleum distillates, considered in connection with 
their specific gravity and boiling-point, will be a very valuable 
aid as an indication of the predominating hydrocarbons that 
are present. Only a few investigators have reported this con- 
stant. Since the determination is so readily made, one drop of 
oil being a sufficient quantity, it is hoped that observations 
may be hereafter reported from every oil-field. The index of 
refraction of such pure hydrocarbons as have been isolated is 
generally determined, and in some cases also that of the dis- 
tillates from which they were obtained have been reported. 
Comparison of data from fields that have been thoroughly in- 
vestigated chemically with the preliminary data from new 
fields will undoubtedly be of much value. 3 
2. Rotation of the Plane of Polarization of Light. 
The optical properties of the distillates were not examined 
until nearly two years after the distillations had been made. 
