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Figures (3)

Fig. 1
Fig. 1

Spectrograms made with diffusing quartz before slit: D, 25-watt Mazda lamp, 65 hrs.; 500-watt Mazda CX, illumination doubled, exposed A, 2 min.; B, 5 min.; C, 10 min.; E, 20 min.; F, 30 min.; G, 45 min.

Fig. 2
Fig. 2

Spectrograms made with diffusing quartz before slit, equal total energy for all sources. A, B, C, quartz mercury arc; D, E, F, Mazda Sunlight lamp (Type S-1); G, H, K, 500-watt Mazda CX lamp, L, M, N, 500-watt projection lamp. Exposure-time 10 sec., 1 min., 6 min. for each source.

Fig. 3
Fig. 3

Spectrograms of quartz mercury arc, Mazda Sunlight lamp (Type S-1) and 500-watt Mazda CX lamp, equal energy at the diffusing quartz for all energy between λ2800 and λ3100. Exposures 5, 30 and 180 seconds for each source.