A new type of luminescence microscope is described. Its use in the examination and comparison of materials luminescing under electron bombardment in vacuum is explained. Fields of self-luminous particles are obtained of sufficient brightness to permit of satisfactory visual observation at magnifications up to 500×. Good photomicrographs can be made at 100× with ordinary film. In the study of manganese-activated calcium silicates, this microscope has facilitated the determination of many of the relationships which exist between color of luminescence, intensity of luminescence and crystal form. The low temperature form of calcium metasilicate luminesces more brightly than any other calcium silicate studied. A thorough wet mixing of raw materials is necessary to obtain a product of uniform luminescence.
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