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Basil Gum, Tony Haerl, and Herb Hanes construct casings for the 140-foot telescope's receiver

Dish-shaped radio telescopes can focus their radio waves directly up to the focus and into a receiver there or use a second reflector at the focus to shoot the waves to a suite of receivers in the middle of the dish. The 140-foot telescope in Green Bank, West Virginia was originally a prime focus type, but in 1974 was adapted into the other type, known as a Cassegrain. In the ever-busy machine shop on site, Basil Gum, Tony Haerl, and Herb Hanes construct casings that will nestle in the throat of the 43-meter dish and safely protect its new receiver family.

Credit: NRAO/AUI/NSF

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The National Radio Astronomy Observatory is a facility of the U.S. 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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