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   PR # 11183
      Recent investigation mainly based on Einstein EMSS survey results,
    indicates that clusters may have been changed in their size, tempera-
    ture or mass inrelatively recent universe z~0.5. Then the evolution
    of temperature function is also expected to be seen. We propose obser
    vations of seven clusters-of-galaxies-sample which has redshift distr
    ibution from z=0.35 to 0.55, selected by Dressler & Gunn(1992). They
    are all rich, representative concentrated clusters like the nearby
    Coma cluster. Measureing their temperature and luminosity, we expect
    to get a kind of complete sample to indicate the evolution of energy
    spectrum of Coma like clusters of galaxies.


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