The apparatus is shown in Fig.1, which is mounted within a conventional metal bell jar 45 cm in diameter and 70 cm high. The boat source could be seen through the windows of the appratus and the bell jar.There was no straight-line exit from the apparatus to the interor of the bell jar for Be vapor originating at the boat.Tantalum boat, 13 mm wide, 28 mm long, and 0.1 mm thick, was used as evaporation source. The distance from the boat to the substrate was 15 cm. Microscope glass slide coated with betaine as substrate.The Be foils produced by resistance heating were removed from the glass by dissolving the The apparatus is shown in Fig.1, which is mounted within a conventional metal bell jar 45 cm in diameter and 70 cm high. The boat source could be seen through the windows of the appratus and the bell jar. Where was no straight-line exit from the apparatus to the interor of the bell jar for Be vapor originating at the boat. Tantalum boat, 13 mm wide, 28 mm long, and 0.1 mm thick, was used as an evaporation source. The distance from the boat to the substrate was 15 cm. Microscope glass slide coated with betaine as substrate. The Be foils produced by resistance heating were removed from the glass by dissolving the