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

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288<br />

Above, Mrs. W. F. Har-<br />

low <strong>of</strong> <strong>the</strong> radio divi-<br />

sion, NBS, listens with<br />

something like incre-<br />

dulity to a radio broad-<br />

cast picked up by a<br />

homemade crystal set.<br />

Below, <strong>the</strong> widely cir-<br />

culated wiring diagram<br />

and details <strong>of</strong> that Bu-<br />

reau crystal set that<br />

could be built <strong>for</strong> $10.<br />

TELLPHONL<br />

DIAGRAM AND DLTAILS OFRLCfJVING5[T

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