428 
MR WILLIAM SWAN ON THE PRISMATIC SPECTRA OF THE 
Tasie III. Observations of the Carbohydrogen Spectrum. 
of Means 
I. and II. 
SERIEs I, SERIEs II, 
Line of the 
Spectrum. Renee st Naan is adie’ ae 
tions. F tions. ‘ 
a 5 48° 18’ 14” a ome ka 
B 48 32-9 6 48-32 -% 
B, 9 48 35 12 
By 9 |48 87 60 
B, ; 9 48 40 10 
OY 9 ZB) Bh Bh 4 | 49 31 
WA 65 3B 9 49 23 
6 2 49 41 58 6 49 41 58 
0, 9 |49 44 48 
O, 9. |49 46 37 
0, 9 | 49 48 41 
€ a 4 50 27 54 
iz 3 50 35 37 6 50 35 28 
= ° Mean Temp. of Prism. 626 5 
Mean Bares. 30-02" |Mean Temp. of ea 
COLLECTED OBSERVATIONS 
| OF MINIMUM DEVIATIONS. 
Difference 
Total Num- 
ber of Ob- 
servations. 
Mean of all the 
Observations. 
48° 18’ 
32 
14” 
7 
12 
50 
10 
34 
or Oo Oo Oo Oo 
In Table IIT., the deviations of the lines «, B, y, 3, and Z, were alone determined by the theodolite ; the other lines 
were then referred to «, 6, &c., by micrometer observations. 
Taste IV. Comparison of Contiguous Lines in the Solar and Carbohydrogen Spectra, 
SoLar SPECTRUM. 
3 Deviation Index of 
5 (D.) Refraction («.) 
BS 
Dj; 48° 18’ 18”| 1-621079 
b,| 49 2 55 | 1-628659 
Fy) 49 49 2 | 1:636407 
G| 50 35 4] 1:644068 
CARBOHYDROGEN SPECTRUM. 
Deviation Index of 
(D.) Refraction (%.) 
48° 18’ 14”) 1-621083 
49 3 34 | 1:628769 
49 48 41 | 1:636349 
50 35 28 | 1:644147 
0 1”| po—p [0:000004 
0 39 | Uy—ps, |0°000110 
0 21 | py —p3, 0:000058 
0 24 | uz—p, |0:000079 
