THE ULTRA-VIOLET SPECTRA OF THE ELEMENTS. 
221 
Tin. 
Tin is remarkable for the number and strength of its lines in the higher region of 
the spectrum, while its lines of lower refrangibility are so feeble that we have never 
seen any in the arc in the visible part of the spectrum. Cornu has recorded one line 
at wave-length 3260, and we have had no difficulty in recognising this line, but a line 
very* nearly in that place is also developed by lead when other tin lines are not 
developed, and we have not been able to perceive that these lines are separable in any 
of our photographs. Many of the higher lines of this metal are easily reversed, indeed 
are almost always reversed in our photographs. 
Tin lines. 
Approximate 
wave-length. 
Remarks. 
Approximate 
wave-length. 
Remarks. 
3326-0 
2523-5 
3260'0 
Given by Cornu. 
2495-5 
3175-0 
2493-5 
* 3141-7 
2483-1 
3033-0 
2429-5 
3008-5 
2421-5 
2986-4 
2407-9 
13-1 
2392-5 
2862-8 
2364-7 
2839-5 
2357-7 
2813-5 
2354-5 
2812-5 
2334-3 
2787-5 
2317-0 
2784-7 
2286-9 
2779-5 
2282-5 
2761-5 
2275-4 
2660-7 
2251-0 
Strong, reversed. 
2636-5 
2245-8 
Strong. 
2593-5 
2231-3 
2571-0 
2210-7 
2557-5 
2198-7 
2546-1 
2194-1 
2530-7 
Antimony lines. 
Approximate 
wave-length. 
Remarks. 
Approximate 
wave-length. 
Remarks. 
4032-0 
2597-5 
3637-0 
Close above a lead line. 
2528-0 
3265-0 
2426-0 
3230-8 
2383-3 
3228-0 
23130 
Very strong, reversed. 
3028-0 
2310-0 
2876-5 
