﻿32 



Messrs. W. J. Jones and J. R. Partington 



th 



Gas. 



Wave-length 

 in mm. X 10 6 . 



Eefractivity 

 at 0° C. and 

 760 mm. Hg. 

 (,,-1) HT. 



<P- 



Ideal 

 Refraetivity 



(l"o-l)10 f . 



Krypton 



486 

 578 

 671 

 486 

 578 

 671 

 436 

 589 

 436 

 589 

 671 

 436 

 546 

 589 

 671 

 486 

 546 

 579 

 671 

 589 

 589 

 589 

 436 

 671 

 436 

 578 

 589 

 656 

 436 

 546 

 671 

 436 

 671 

 436 

 671 

 589 

 589 



4318 

 4276 

 4253 

 7130 

 7030 

 7007 

 3420 

 3350 

 4575 

 4498 

 4470 

 6960 

 6820 

 6760 

 6610 



5160 

 2950 

 3790 

 8710 

 8430 

 4500 

 4420 

 4410 

 4400 

 7820 

 7690 

 7630 

 7430 

 7170 

 6190 

 5980 

 7730 

 4470 



0-99744 

 0-99744 

 0-99744 

 0-99266 

 0-99266 

 0-99266 

 0-99959 

 0-99959 

 0-99308 

 0-99308 

 0-99308 

 0-98040 

 0-98040 

 0-98040 

 0-98040 

 0-98913 

 0-98913 

 0-98913 

 0-98913 

 0-99267 

 0-99892 

 0-98891 

 0-97999 

 0-97999 

 0-99843 

 0-99843 

 0-99843 

 0-99843 

 0-98924 

 098924 

 0-98924 

 099222 

 0-99222 

 0-99179 

 0-99179 

 0-98417 

 0-99272 



4307 



4265 



4242 



7078 



6978 



6956 



3419 



3349 



4544 



4467 



4439 



6824 



6687 



6628 



6481 



6498 



6428 



6400 



6351 



5122 



2947 



3748 



8536 



8261 



4492 



4413 



4403 



4393 



7736 



7607 



7548 



7371 



7113 



6139 



5930 



7608 . 



4437 

























j» 





Hydrogen sulphide 



j j 



Nitrous oxide 







Cyanogen 





Methane 





" 



" 







" 



Ethylene 





Acetylene 





Chlorine 



Hydrogen chloride 



In Table II. the dispersions of a number of gases have 

 been expressed in terms of the ideal refractions for wave- 



length 589. 





Table II. 







Wave-length i 436 



486 



656 



671 



Gas. 

 Hydrogen 



+20 



+39 



+36 



+44 



+ 196 



+89 



+ 14 



+22 

 +24 

 +36 



-5 



-10 



-14 



-10 



-147 



Air 



Oxygen 



Nitrogen 



Sulphur dioxide 



Methane 



