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   PR # 43037
   We propose to observe two of the 15 brightest X-ray clusters at
   redshifts above 0.2 in the Northern sky. The ASCA spectra will allow
   accurate temperatures and metallicities to be determined for clusters
   at a substantially earlier epoch in their formation. The proposed
   targets are drawn from the ROSAT All-Sky Survey and have all been
   observed with the ROSAT HRI in a co-ordinated optical, radio and
   X-ray study of distant clusters of galaxies. The two clusters have
   very different optical and X-r
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