Research activities were concentrated on three fields:

1: Final reduction of the Mark III interferometric data on binary stars 
   and the publication of the binary orbits;
2: Final reduction of the Mark III astrometric data and the publication 
   of the results;
3: Software development for the Navy Prototype Optical Interferometer.

ad 1: The paper on the orbit of the spectroscopic binary Eta Andromedae, 
      derived from measurements with the Mark III optical interferometer
      on Mt. Wilson, CA, was finished and published in the Astronomical
      Journal, 106, 2486. A paper on Capella was finished and published
      in AJ, 107, 1859. Orbits of six more binaries were finalized; a 
      first draft the corresponding paper was written. Results of this 
      work were presented at the AAS meeting 183 in Arlington, VA.
ad 2: The data reduction was finalized and the results will be published
      in the July issue of AJ. I contacted colleagues of the HIPPARCOS 
      astrometry satellite team and obtained preliminary positions of 
      the twelve stars we had measured. The agreement with our positions
      is reasonably good and confirms that the measurement accuracy of 
      the Mark III exceeded the FK5 standard by about a factor of 2.
      Results were presented at the AAS meeting 183.
ad 3: Software development for the NPOI has led to the completion of a
      program to invert large but sparse matrices, which will be used
      for global astrometric solutions with many years of data. A first
      version of the CHAMELEON program for the averaging and calibration
      of visibility data from the NPOI will be finished by the end of
      the report period.