AbstractMagnetic moments of long lived high spin isomers can be measured to high precision by a number of different methods applicable in different ranges of half lives. The high spin states in the Hf‐ and Pb‐region have a relatively simple and well understood structure. An analysis of the magnetic moments of these states gives the following results:iThe additivity theorem is fulfilled.iiThe agreement between experimental and calculated values is satisfactory.iiiIn many cases the moment can contribute to the clarification of the structure of the state.ivThe influence of mesonic exchange currents on thegl‐factor can be determined experimen