Black and white image of the second 85-foot telescope

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Black and white image of the second 85-foot telescope

The NRAO’s second 85-foot telescope came as a kit from the Blaw-Knox Corporation. It was ready for observation in February 1964 and paired with the Howard E. Tatel 85-foot telescope to form the NRAO’s first array, the Green Bank Interferometer (GBI). The GBI was changeable, because this telescope had its own built-in wheels to allow it to be hauled it up and down a stretch of road leading from the Tatel. Changing the distance between the 85-footers changed the resolution of the array’s combined view: farther equals higher resolution.

Credit: NRAO/AUI/NSF

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The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.
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