In the preparation of beryllium-copper alloys by fused-salt electrolysis, beryllium was electrowon from beryllium oxide dissolved in fluoride electrolytes and deposited on copper cathodes. At 870 deg to 1,030 deg c, deposition was on solid cathodes. Beryllium deposited on the copper, forming a liquid alloy that dripped from the cathode. Dripping alloys containing 3 to 4 weight- percent beryllium were produced with as high as 90 percent cathode current efficiency, by electrolysis at 910 deg c. To prepare alloys of higher beryllium content, attempts were made at depositing beryllium on liquid copper cathodes. These efforts were genreally unsuccessful, although alloys containing as much as 12 percent beryllium were prepared by this method. At temperatures of 1,100 deg to 1,300 deg c, requisite to maintaining beryllium-copper compositions as liquids, the beryllium reacted with cell structures.