Tlieorij of Refraction in Gases. 

 Table III. 



487 







ic 



X 



l-E(ar) 



X 



X 



l-^{x)- 



:r. 



E.r. 



1-366- 



^^1-360- 



l-366(^ ^i-366)- 



1-297 • 



^1-29?- 



1-39880 



(l-^l-2'97) 



- -0849 



3 



1-48372 



219 



1-37639 



--20S2 



2-31 



4 



1-43824 



2-92 



1-48214 



-•0853 



3^08 



1-48392 



+-0457 



4-7 



1 •37920 



3-44 



1-47744 



--0297 



3^62 



1-46392 



+•0847 



o 



1-35383 3-66 



1-46320 



-•0140 



3-85 



1-44959 



+•0957 



6 



1-27872 4-39 



1-40600 



+ -0185 



4-62 



1-38651 



+•1078 



7 



1-22242 5-12 



1-34397 



+ •0296 



5^39 



1-32239 



+•0999 



8 



1-18183 5-85 



1-28961 



+ •0302 



6-16 



1-26972 



+•0879 



9 



1-15280 6-59 



1-24551 



+ •0269 



6-93 



1-22636 



+•0735 



10 



1-13146 7-32 



1-20943 



+ -0219 



7-71 



1-19279 



+•0613 



11 



1-11542 8-05 



1-17980 



+ 0162 



8-48 



1-16310 



+-0477 



The number 1-366 is the ratio in which g)^ is increased as 

 the temperature increases from 0^ to 100° C, and 1'297 is 

 the ratio of p^ for the Na line to p"^ for the Li red line. 



If we call ^ for the Na line at 0°C. a', we have theoretically 



ft)" 



h 



and 



. h 1-36 6 



"^Aii9o 1-366 



l+A(i^E.') 



_ /Uqo - 1 



/^lOO" — 1 



1 



These two equations are theoretically sufficient to determine 



— |- and OS. /jLo° and ^ioo° were calculated from the experi- 



ments, and then by trial and error the constants were 

 determined. 



Ketteler gives for the dispersion 



^p — 1 __ 



P 





= 1-0034. 



If we take &^ =4*7 at 0° C. for the Na line, we get 



ft) 



l_-%-x-4639 



= 1-0034. 



