about +30° to the pole. Arrays of that type, but with somewhat less resolution and sensitivity than the VLA, operate at Westerbork in the Netherlands and Cambridge, England. The VLA was designed with the specific requirement of being able to extend high-resolution observations down to at least -20° declination, and the three-armed configuration and the large number of antennas result directly from this need. The lost declination would thus occur in precisely the most valuable region, and would severely restrict the scientific potential of the instrument. REFERENCES CCIR Report 224-4, XIVth Plenary Assembly, Kyoto, 1978, published by International Telecommunications Union, Geneva, 1978. Fomalont, E. B. and M. C. H. Wright, Galactic and Extra-Galactic Radio Astronomy, Eds. G. L. Verschuur and K. I. Killermann, Springer-Verlag, New York, 1974 Ch. 10. Gustincic, J. J. and P. J. Napier, Proc. IEEE Symposium on Antennas and Propagation, Stanford, California, June 20-22, 1977, p. 361. Heeschen, D. S. Sky and Telescope 49, 344 (1975). Swenson, G. W. and N. C. Mathur. Proc. IEEE 56, 2114 (1968). Weinreb, S., M. Balister, S. Maas and P. J. Napier. EEE Trans. Microwave Theory and Tech., MTT-25, 243 (1977).
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