Show HOW RADUM IS OBTAINED 7 f elt 4 d X 4 A 4 Z I 1 the installation ins ta illustrated in the photograph la Is designed for the treat trea ment of pitchblende pitch pi t blend residues as obtained in the manufacture of uranium these residues are the most important of radium holding materials the res resi dues due 8 are mechanically stirred in the tanks the sifting operations last abou two and a half months and at the end of that time one or two milligram of impure radium bromide will be obtained from each ton of residue |