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  • The New Astronomy: Opening the Electromagnetic Window and Expanding Our View of Planet Earth
    During this period, they excavated a 21.9 metre (72-ft) diameter parabolic hole in the sand just north of the blockhouse, lined … … packing cases in order to provide a reflective surface, installed a mast with a dipole , and connected this crude … As the Earth rotated , this transit instrument received emission from the sky overhead, in the process revealing … This initial result inspired Pawsey to assign funds for an expanded 400 MHz hole-in-the-ground antenna (Figure 9), and by altering the position of the … … placed guy ropes the new concrete-coated 24.4m ( 80 -ft) dish was able …