THE SPECTRUM OF NOVA PERSEI AND THE STRUCTURE OF ITS BANDS. 
Photo-Plate No. 6, 1901 April 1 and 5. 
TaBLE I.— continued. 
259 
Angle of inclination of plate = 0°; width of slit 0-020 mm. ; orthochromatic plate ; exposure 6 hours, 
3-2 h. on April 1 and 2°8 h. on April 5; plate was intensified and the spectrum is faint ; the spectrum was. 
measured 4 times and referred to 30 standard lines ; fair definition ; focus same as on plate No. 1. 
A 0 | Intensity. A V. 
Men |? | * 4442 | 4 
ma)? | | /4sca-2 | 0-7 
mit | 3 4483 1:3 
43107 0-1 r 4498 | 3 
43284 08 2 452 | 2 
4337°5 | 16 ay 4 | 4563 y 
wee | 18 | | 4568 | 3 
4350 16, a‘ =0 | 4593 | 3 
43559 05 | 4614 | 2 
43588 0-9 2 ' 4638 «| 4 
myo )2 | |! | 46681 | 08 
43851 | 02 | 46781 | 0:8 
(4402-4 | 0-5 ‘ 4690-0 | 0-6 
| 44305 | 0°4 | - 4709-4 | O-7 
| 4442 | 4 wan | 16 
Intensity, A v. | Intensity. A v. | Intensity. 
4731 16 4933 1:3 
3 0:5 05 
476- 8 4943 3 
3°5 0:3 7 0 
3 4800 3 1 5037 6 12 
4846°5 | 0°6 2 | 5003 3 
2°5 3) 0 
4853 18 5160 2 
* 7 0-22 
4863°8 | 0°6 | 51770 | O-1 
3 0 0 
4865'1 | 0-6 5299 6 
3°5 8 0-2 
ASTO 101 =Onp ose ) 9) 4 
3 9 6 | 0-5 
487671 | 1:0 5447 7 
3D 5 1 
4878-9 | 0-9 4 7 5498 7 
4 0°38 
4882 2 3 5578 2 
3°5 1 0 
4895'4 | 0-7 5604 3 
3 0-2 i 0-5 
4911 + 56777 | Ol 
2-5 0 i 0°8 
4925 17 57138 IS4f 
il 02 
4933 1-3 5739 | 4 
definition. 
* Defect in film ? 
Photo-Plate No. 7, 1901 April 10 to May 3. 
Angle of inclination of plate = 0°; width of slit 0°020 mm.; orthochromatic plate; exposure, near 
horizon, 9 hours on 7 days; the plate is fogged; the spectrum was measured twice and is very faint; bad. 
| Intensity. 
A Intensity. jee Intensity. A Intensity. A Intensity. 
4455 4614 4845 5005 i 
4504 4718 4882 5021 
4536 
In Table [V. I have combined the results obtained from three plates to mean values, 
in order to exhibit the agreement in position of corresponding points of the three H- 
bands as reduced to X = 4500, and also to show in what manner the observed degrees 
differ. Towards the less refrangible end H, declines in intensity 4 degrees on 25 tenth- 
metres and passes into a bright spectrum, while H, decreases 8 degrees and fades into 
TRANS. ROY. SOC. EDIN., VOL. XLI. PART II. (NO. 10). 
40 
