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Figures (3)

Fig. 1
Fig. 1

Intensity of blackbody radiation at temperatures of 2600°K, 2800°K, 3000°K, 3200°K, 3400°K and 3600°K for the wave-length range 2000–11,000A. The ordinate represents the logarithm of the intensity in arbitrary units.

Fig. 2
Fig. 2

Details of the water-cooled unit carrying 150 amp. to the tungsten ribbon.

Fig. 3
Fig. 3

Schematic arrangement of the lamp with its auxiliary parts.