444 PROF. F. W. DYSON: DETERMINATIONS OF WAVE-LENGTH FROM SPECTRA 
Exner and Haschek, and are generally strong in the arc and the sun. Enhanced 
lines are possibly shown at 4067 and 4245, but the identification is not certain. The 
line at 3769 may well be enhanced Ni. 
Chromosphere. 
Wave4ength. 
Sun. 
Spark. 
Arc. 
Wave4ength. 
No. of photos. 
Intensity. 
3769-66 
4 
3 
3769-60 
3 
20 
1 
A considerably enhanced line at 3484 is not shown. 
Cobalt. 
Cobalt, like nickel, is very weak. There are enough lines to assert its existence in 
the chromosphere with certainty. They are all of intensity 1 or 0, with the exception 
of an enhanced line at 3621. There are 16 arc lines of intensity 9 or 10 given by 
Hasselberg, and 3502‘4 and 4118'9 are the only ones certainly not shown. 
Chromosphere. 
Wave4ength. 
Sun. 
Spark. 
Arc. 
Wave4ength. 
No. of photos. 
Intensity. 
3621-38 
3 
2 
3621-34 
2 
10 
— 
Zinc. 
The strong arc triplet, 4680, 4722, 4810, is possibly shown, though faintly, in the 
chromospheric spectrum. 
Chromosphere. 
Wave-length. 
Sun. 
Arc. 
Wave4ength. 
Intensity. 
4680-26 
1 
4680-32 
Zn 1 
20 
4722-49 
2 
4722-34 
Zn 3 
20 
4811-04 
2 
4810-72 
Zn 3 
20 
Mr. Lord gives lines at 4722*23 and 4810*90 of intensity 1. The line at 3345*4 is 
not shown, and it is impossible to say whether 3302*90 is shown owing to the 
proximity of Na. 
