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Measures for Progress: A History of the National Bureau of Standards

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One <strong>of</strong> <strong>the</strong> three giunt IVurtsburg antennas at <strong>the</strong> <strong>Bureau</strong>'s Gun Barrel Hill, Colorado,<br />

field station. Used in radio propagation research, a dipole at <strong>the</strong> focal point <strong>of</strong> tive<br />

paraboloid reflector receives radio energy from <strong>the</strong> sun.<br />

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