THE SPECTRUM OF NOVA PERSEI AND THE STRUCTURE OF ITS BANDS. 255 
TaBLE I. 
Photo-Plate No. 1, 1901 March 3. 
Angle of inclination of plate=0°; width of slit 0°018 mm. ; orthochromatic plate ; exposure 2°4 hours ; 
the spectrum was measured 6 times and referred to 50 standard lines; good definition of spectrum; the 
more refrangible end beginning at A = 4500 is increasingly out of focus. 
v. | Intensity. A v. | Intensity. a v. | Intensity. ar v. | Intensity. 
P 4317-‘7 | 0°5 4 | 48444 07 9 5007 16 3 
1:3 6 4320°2 | 0°6 3 | 48476 | 0°8 ) 5024 6 | 3 
2°4 P 43213 | 0:4 6 6 | 4850°3 | 1°5 =15] 5046 2 0-3 1 
1-2 4 4325°5 | 0°3 P 48516 | 1:0 14=15}) 5121 2 1 
40778 | 08 | 43293 | 06 | |, 4852°9 | 0°5 =15] 5143/2 | | 
40862 | 1:1 5 43341 | 0°8 1 4854°8 | 1:2 12 5160 1 3 
4090°5 | 0°8 10 4359°7 | 0-7 10 4869 1:4 8 5210 16 | 15 
4097°7 | 0-4 9 4367 15 9 4873°2 | 05 14 5241 3 0:5 
4117-9 | 0-4 9 441238 0°8 7 | 4883°2 | 0°7 5271 16 1 
4123°7 | 0°8 6 7 4435 2 6 | 4890-0 | 0°8 : | 6 5306 6 3 3 
41456 | 0°6 5 4454:2 | 1:0 7 7 | 4896°9 | 0-5 9: 3 5347 2 3 
4161°3 | 1:2 7 4476 Z 17 | 9 | 4902 1 | 2°5 5362 1 0 15 
4186°5 | 0-7 6 4584 3 6 10 | 4907 1:3 5 5 5381 2 2 
4200°8 | 0°9 5 4619 4 75] 4925°0 | 0-7 5520 2 4 
16 4 4640 a 8 | 4934-2 | 0 : 5544 9 4°5 
42216 | 0°5 6 5 4686 3 7 | 4943-1 | 0°8 2 5586 1 3 4 
10 A 4801 2 P 6 | 4959 | 4 1 5678 3 2 
5 5 4835°2 | 0°5 | 4 | 4981 | 2 03 5711 4 1 
0°5 4 4839°3 | 0°9 3 | 4985 | 8 1 5747 3 0:3 
0°5 4844-4 | O7 8 | 5007 16 2 
* The enlargement shows a maximum within this space. 
Photo-Plate No. 2, 1901 March 6 and 8. 
Angle of inclination of plate=0°; width of slit 0°018 mm.; orthochromatic plate; exposure 1:8 
ours, | h. on March 6 and 0°8 h. on March 8; the plate was intensified and is slightly fogged; the 
pectrum is not so dark as on No. 1; it was measured 4 times, 3 times on the intensified plate, and referred 
0 22 standard lines ; good definition ; focus same as on No. 1. 
: 
| 
: A a | Intensity. A v. | Intensity. aA v. | Intensity. A v. | Intensity. 
j4s9 2 | | 43502 Jo | 4545 [3 | 43523 |0 || 49 
J#1s2 fos | | | 43657 | 07 3 [soo jis | 4355-4 | 0-9 | ; 
|4996 | 2 4375°6 | 1°3 2 | 46167 | 0-4 4857-7 | 0-3 
1 1 4 10 
M19) 15 | | | 43070 | 02 | 4643-6 | 0-6 48618 | 04 | 
#5246 |0-4 | | 441s | o-4 | desis 2) |. | 2q aero 2m 
4328-6 | 0-4 | } 44660 | 0-7 | 47202 /11 | | 48797 | 0-9 |, 
4337-8 lg | aarr|5 : Ania Sy | 4881-8 | 1-1 i. 
ear | | | re 4 |. 48464 [07 | | 4883-3 | 0-1 (2 
4528-0 | 0 4849-9 | 0-7 4892 | 2 ha 
6 3 0-5 
4545 | 3 48523 | 0 10 4998 | 3 
Table I. is continued at the top of the next four pages. 
