Abstract
The reflectivities of evaporated films of aluminum, copper, silver, and beryllium have been measured spectrographically in the region 1200-2200A before the films were exposed to air. Copper reflection was considerably higher before contamination by air than afterward; the other metals showed no effect. The pronounced minimum in beryllium reflectivity found by previous investigators did not occur here; it is believed that this minimum is due to a thin film of tungsten evaporated over the beryllium.

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