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   PR # 21145
     The proposed clusters of galaxies (A773, A1204, A697) are on the    
    schedule of the observation of Sunyaev-Zel'dovich effect at MRAO     
    using the Ryle Telescope, which is an interferometer suitablly       
    designed to reduce  the systematic errors associated with the single-
    dish, beam-switching technique employed so far.Combining the obtained
    decrement temperature with the ASCA X-ray imaging data, which provide
    the electron temperature and density distributions within each       
    cluster, we can get the value of the Hubble constant independent of  
    the usual distance-ladder arguments.In order to control the effect of
    cluster elongation and the selection effect of cluster sampling, it  
    is needed to apply this method to a suitable number of clusters.     
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