From: r_delaney2001@yahoo.com   
      
   On another board, during some discussion of relativity,    
   it was claimed that a test of relativistic Doppler shift    
   could be performed via frequency combs (a recent tool)    
   and diffraction gratings; i.e. v = fλ   
      
   Then, someone objected, dismissing the argument as    
   circular, since the diffraction grating model itself    
   depends on assuming a constant speed of light, c, as    
   per Einstein's second postulate.   
      
   I don't recall this.  Anyone here wish to comment?   
      
   --   
   Rich   
      
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