REFRACTIVE INDEX OF GASES ON TEMPERATURE. 
441 
Diagram I. 
Taking means we get 
Mean temperature 
Temperature of 
Ratio. 
of iacket, 
manometer, 
“ C. 
° C. 
From (1 ) and (2) . 
6-282 
10-55 
13-9 
.. (3) (i) ■ ■ 
6-282 
10-55 
13-9 
„ (5) (6) . . . 
6-267 
10-65 
14-1 
3 L 
VOL. CCI.-A. 
