L. P. Wheeler — Dispersion of Metals. 



Table III— Gold. 



497 



Observer 



a 



n 



nk 



-^(lO)- 12 

 A, 3 



r 



n?(K*-l) 



A 



K 



Tool 



40(V 



1-58 



1-79 



44-2 



7-49 



0-71 



66-5 



65-8 



" . 



420 



1-57 



1-80 



38-2 



6-97 



0-78 



67-9 



67-1 



a 



440 



1-55 



1-79 



32-4 



640 



0-83 



68-6 



67-8 



a 



460 



1-45 



1-74 



25-7 



5-70 



0-93 



670 



66-1 



Tate ! 



460 



1-66 



1-83 













Tool 



480 



1-28 



1-69 



19-6 



4-96 



1-21 



63 -3 



62-1 



Tate 



480 



1-53 



1-87 





_ 









Tool 



500 



0-935 



1-75 



13 V 1 



4-07 



2-19 



58-3 



561 



Tate 



500 



1-33 



2-01 













Tool 



520 



0-670 



2-01 



9-55 



3-47 



3-60 



51-7 



47-9 



Tate 



520 



1-10 



2-19 













Tool 



540 



0-535 



2-31 



7 _ -83 



3-15 



5-02 



51-3 



46-3 



Tate 



540 



0-937 



2-55 













Tool. 



580 



0-415 



2-75 



5-85 



2-72 



7-40 



50-9 



43-5 



Tate 



580 



729 



3-02 













Drude 



589 



0-366 



2-82 















Tate 



600 



0-666 



3-24 













Tool 



620 



0-350 



3-16 



4-64 



2-42 



9-88 



51-8 



41-9 



Tate 



620 



0-645 



3-41 





.... 









Drude 



630 



0-306 



312 











.... 



Tool 



660 



0-320 



3-54 



394 



2-23 



12-4 



54-1 



41-7 



Tate 



660 



0-636 



3-73 













" 



680 



0-617 



3-86 













Tool 



700 



0-280 



3-80 



3-ib 



1-97 



14-3 



53-8 



39-5 



operator. A transverse wave-train advancing in the x direction 

 with a velocity Y may be specified by 



E, 



eXv-0 



where p is the frequency and i = V — 1. With the aid of this, 

 the equation of condition becomes 



C 2 

 V 2 



K + i 



4ttC 2 ( 

 P 



Since the real part of the ratio C/Y is by definition the index 

 of refraction (?i), we set C/V=n(l+i/c)* and hence we have 



n »(l _ K * + 2ik) = K + i 4 ^^ . (1) 



p 



The significance of ?i/c becomes evident on substituting the 

 value of Y in the equation of the wave train, which then 

 becomes 



E v 



u e C e ^ 

 * Drude's notation. 



