Disassembling a radio telescope, 1960s. Staff at the National Radio Astronomy Observatory (NRAO) in Green Bank, West Virginia, USA, disassembling the 42-foot portable radio telescope. The 42-foot telescope's trailer carried the dish as stacked panels and also integrated the telescope's donut-shaped drive and a small control room. In the mid-1960s, this little telescope served as the fourth, remote member of the Green Bank Interferometer (GBI), the test array for the Very Large Array (VLA).