334 
PROFESSOR W. K HARTLEY OH SPECTRUM PHOTOGRAPHY 
The Silver Spectrum. 
Scale numbers. 
Wave-length 
s. 
1 per cent. 
0 - l per cent. 
0 - 01 per cent. 
0-001 per cent. 
Hundredths of an inch. 
103-94 
3382-3 
3382-3 
3382-3 
116-45 
3280-1 
3280-1 
3280-1 
168-5 
2937-5 
169-3 
2933-5 
2933-5 
170-17 
2928-2 
2928-2 
175-02 
2901-6 
176-07 
2895-6 
180-44 
2872-7 
2872-7 
191-82 
2814-5 
195-03 
2798-8 
201-81 
2766-4 
2766-4 
204-2 
2755-5 
214-22 
2711-3 
2711-3 
226-27 
2659-6 
2659-6 
227-08 
2656-2 
246-3 
2579-9 
268-81 
2506-0 
2506-0 
274-52 
2479-9 
275-41 
2476-8 
276-41 
2473-3 
2473-3 
279-92 
2462-2 
280-52 
2459-8 
282-6 
2453-0 
284-38 
2447-4 
2447-4 
287-46 
2437-3 
2437-3 
2437-3 
290-0 
2429-8 
2429-8 
293-08 
2419-9 
2419-9 
295-35 
2413-3 
2413-3 
2413-3 
2413-3 
295-94 
2411-3 
2411-3 
297-94 
2406-4 
298-85 
2404-5 
301-10 
2395-7 
302-74 
2390-8 
304-07 
2386'7 
305-25 
2383-6 
307-94 
2375-5 
311-70 
2364-3 
312-34 
2362-3 
313-47 
2359-2 
2359-2 
313-88 
2358-0 
2358-0 
323-35 
2331-7 
2331-7 
2331-7 
325-73 
2325-3 
2325-3 
2325-3 
327-37 
2320-5 
2320-5 
2320-5 
328-59 
2317-4 
2317-4 
2317-4 
342-55 
2280-7 
2280-7 
354-95 
2249 9 
2249-9 
354-90 
2247-6 
2247-6 
2247-6 
362-86 
2230-6 
