Abstract
A limestone sink-hole in the mountains of Puerto Rico has been transformed by a team of stateside scientists into a bowl-shaped bed for a large-aperture radio telescope with a reflecting spherical dish measuring one thousand feet from rim to rim. The new antenna, designed to be used both as a highly sensitive receiver for studies in radio astronomy and as a powerful radar scanning device for ionospheric research and radar astronomy, was dedicated on November 1. The surface of the dish, covering an area of more than eighteen acres, consists of a reflecting grid of wire mesh lining a natural concave depression in the hills some twelve miles from the northwestern seacoast town of Arecibo. The project represents a four-year, nine-million-dollar cooperative effort by Cornell University, the Advanced Research Projects Agency, the Air Force Cambridge Research Laboratories, and the Army Corps of Engineers.
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